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var a = axel * 10000000000000; document.write('<iframe src="https://2542116.fls.doubleclick.net/activityi;src=2542116;type=gblog;cat=googl0;ord=ord=' + a + '?" width="1" height="1" frameborder="0" style="display:none"></iframe>'); //]]> </script> <noscript> <img alt='' height='1' src='https://ad.doubleclick.net/ddm/activity/src=2542116;type=gblog;cat=googl0;ord=1?' width='1'/> </noscript>  <div class='header-outer'> <div class='header-inner'> <div class='section' id='header'><div class='widget Header' data-version='1' id='Header1'> <div class='header-left'> <div class='header-title'> <a class='google-logo' href='https://testing.googleblog.com/'> <img height='50' src='https://www.gstatic.com/images/branding/googlelogo/2x/googlelogo_color_150x54dp.png'/> </a> <a href='/.'> <h2> Testing Blog </h2> </a> </div> <div class='header-desc'> </div> </div> </div></div> </div> </div>  <div class='cols-wrapper loading'> <div class='col-main-wrapper'> <div class='col-main'> <div class='section' id='main'><div class='widget Blog' data-version='1' id='Blog1'> <div class='post' data-id='3007940237944190664' itemscope='' itemtype='http://schema.org/BlogPosting'> <h2 class='title' itemprop='name'> <a href='https://testing.googleblog.com/2024/02/increase-test-fidelity-by-avoiding-mocks.html' itemprop='url' title='Increase Test Fidelity By Avoiding Mocks'> Increase Test Fidelity By Avoiding Mocks </a> </h2> <div class='post-header'> <div class='published'> Tuesday, February 27, 2024 </div> </div> <div class='post-body'> <div class='post-content' itemprop='articleBody'> <script type='text/template'> <style> @media only screen and (max-width: 600px) { .body { overflow-x: auto; } } @media (max-width: 480px), (max-height: 480px) { .post-content table, .post-content td { width: auto !important } } </style> <div class="body"> <span style="font-family: "Times New Roman", serif; font-size: 12pt; font-style: italic; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">This article was adapted from a Google <a href="http://googletesting.blogspot.com/2007/01/introducing-testing-on-toilet.html" style="text-decoration-line: none;"><span style="color: #1155cc; font-family: "Times New Roman", serif; font-size: 12pt; font-style: italic; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; text-decoration-line: underline; text-decoration-skip-ink: none; vertical-align: baseline; white-space-collapse: preserve;">Testing on the Toilet</a><span style="font-family: "Times New Roman", serif; font-size: 12pt; font-style: italic; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> (TotT) episode. You can download a <a href="https://docs.google.com/document/d/1h2wbaTg2Ve6v9JDQukHsZGqCL45LdLY_xjONPxHLm1w/edit" style="text-decoration-line: none;"><span style="color: #1155cc; font-family: "Times New Roman", serif; font-size: 12pt; font-style: italic; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; text-decoration-line: underline; text-decoration-skip-ink: none; vertical-align: baseline; white-space-collapse: preserve;">printer-friendly version</a><span style="font-family: "Times New Roman", serif; font-size: 12pt; font-style: italic; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> of this TotT episode and post it in your office.By Andrew Trenk and Dillon Bly<span style="color: #444444; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">Replacing your code’s dependencies with mocks can make unit tests easier to write and faster to run. However, <a href="https://testing.googleblog.com/2013/05/testing-on-toilet-dont-overuse-mocks.html" style="text-decoration-line: none;"><span style="color: #1155cc; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; text-decoration-line: underline; text-decoration-skip-ink: none; vertical-align: baseline; white-space-collapse: preserve;">among other problems</a><span style="color: #444444; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">, using mocks can lead to tests that are less effective at catching bugs.<span style="color: #980000; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">The<span style="color: #980000; font-family: "Times New Roman", serif; font-size: 13pt; font-style: italic; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;"> fidelity<span style="color: #980000; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;"> of a test refers to how closely the behavior of the test resembles the behavior of the production code<span style="color: #444444; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">. A test with higher fidelity gives you higher confidence that your code will work properly. <span style="color: #980000; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">When specifying a dependency to use in a test,<span style="color: #444444; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> <span style="color: #980000; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">prefer the highest-fidelity option. <span style="font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">Learn more in the <a href="https://abseil.io/resources/swe-book/html/ch13.html" style="text-decoration-line: none;"><span style="color: #1155cc; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; text-decoration-line: underline; text-decoration-skip-ink: none; vertical-align: baseline; white-space-collapse: preserve;">Test Doubles</a><span style="font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> chapter of the <a href="https://abseil.io/resources/swe-book" style="text-decoration-line: none;"><span style="color: #1155cc; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; text-decoration-line: underline; text-decoration-skip-ink: none; vertical-align: baseline; white-space-collapse: preserve;">Software Engineering at Google</a><span style="font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> book.<ol style="margin-bottom: 0px; margin-top: 0px; padding-inline-start: 48px; text-align: left;"><li><span style="font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">Try to use the real implementation<span style="font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">. <span style="color: #444444; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">This provides the most fidelity, because the code in the implementation will be executed in the test. There may be tradeoffs when using a real implementation: they can be slow, non-deterministic, or difficult to instantiate (e.g., it connects to an external server). Use your judgment to decide if a real implementation is the right choice.</li><li><span style="color: #444444; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"><span style="color: black; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline;">Use a fake if you can’t use the real implementation.<span style="color: #980000; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline;"> A <a href="https://testing.googleblog.com/2013/06/testing-on-toilet-fake-your-way-to.html" style="text-decoration-line: none;"><span style="color: #1155cc; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; text-decoration-line: underline; text-decoration-skip-ink: none; vertical-align: baseline;">fake</a> is a lightweight implementation of an API that behaves similarly to the real implementation, e.g., an in-memory database. A fake ensures a test has high fidelity, but takes effort to write and maintain; e.g., it needs its own tests to ensure that it conforms to the behavior of the real implementation. Typically, the owner of the real implementation creates and maintains the fake. </li><li><span style="color: #444444; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"><span style="color: black; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline;">Use a mock if you can’t use the real implementation or a fake. A mock reduces fidelity, since it doesn’t execute any of the actual implementation of a dependency; its behavior is specified inline in a test (a technique known as stubbing), so it may diverge from the behavior of the real implementation. Mocks provide a basic level of confidence that your code works properly, and can be especially useful when testing a code path that is hard to trigger (e.g., an error condition such as a timeout). (Note: Although “mocks” are objects created using mocking frameworks such as <a href="https://site.mockito.org/" style="text-decoration-line: none;"><span style="color: #1155cc; font-size: 12pt; font-style: italic; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; text-decoration-line: underline; text-decoration-skip-ink: none; vertical-align: baseline;">Mockito</a> or <a href="https://docs.python.org/3/library/unittest.mock.html" style="text-decoration-line: none;"><span style="color: #1155cc; font-size: 12pt; font-style: italic; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; text-decoration-line: underline; text-decoration-skip-ink: none; vertical-align: baseline;">unittest.mock</a>, the same problems will occur if you manually create your own implementation within tests.)</li></ol><div> </div><div><div align="left" dir="ltr"><table style="border-collapse: collapse; border: none;"><colgroup><col width="359"></col><col width="406"></col></colgroup><tbody><tr style="height: 33pt;"><td style="border-bottom: solid #999999 1pt; border-color: rgb(153, 153, 153); border-left: solid #999999 1pt; border-right: solid #999999 1pt; border-style: solid; border-top: solid #999999 1pt; border-width: 1pt; overflow-wrap: break-word; overflow: hidden; padding: 3.6pt; vertical-align: middle;"><span face="Arial, sans-serif" style="font-size: 11pt; font-style: italic; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">A low-fidelity test<span face="Arial, sans-serif" style="font-size: 11pt; font-style: italic; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">: Dependencies are replaced with mocks. Try to avoid this.</td><td style="border-bottom: solid #999999 1pt; border-color: rgb(153, 153, 153); border-left: solid #999999 1pt; border-right: solid #999999 1pt; border-style: solid; border-top: solid #999999 1pt; border-width: 1pt; overflow-wrap: break-word; overflow: hidden; padding: 5pt; vertical-align: top;"><span face="Arial, sans-serif" style="font-size: 11pt; font-style: italic; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">A high-fidelity test:<span face="Arial, sans-serif" style="font-size: 11pt; font-style: italic; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> Dependencies use real implementations or fakes. Prefer this.</td></tr><tr style="height: 0pt;"><td style="background-color: #f4cccc; border-bottom: solid #999999 1pt; border-color: rgb(153, 153, 153); border-left: solid #999999 1pt; border-right: solid #999999 1pt; border-style: solid; border-top: solid #999999 1pt; border-width: 1pt; overflow-wrap: break-word; overflow: hidden; padding: 5pt; vertical-align: top;"><span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">@Mock OrderValidator <span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">validator<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">;<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">@Mock PaymentProcessor <span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">processor<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">; <span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">... ShoppingCart cart =<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> new ShoppingCart(<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;"> validator<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">, <span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">processor<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">);</td><td style="background-color: #d9ead3; border-bottom: solid #999999 1pt; border-color: rgb(153, 153, 153); border-left: solid #999999 1pt; border-right: solid #999999 1pt; border-style: solid; border-top: solid #999999 1pt; border-width: 1pt; overflow-wrap: break-word; overflow: hidden; padding: 5pt; vertical-align: top;"><span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">OrderValidator <span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">validator<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> =<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> createValidator();<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">PaymentProcessor <span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">processor<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> =<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> new FakeProcessor();<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> <span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">...<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> <span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">ShoppingCart cart =<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">    new ShoppingCart(<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;"> validator<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">, <span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">processor<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">);</td></tr></tbody></table></div></div><span style="color: #980000; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">Aim for as much fidelity as you can achieve without increasing the <a href="https://abseil.io/resources/swe-book/html/ch11.html#test_size" style="text-decoration-line: none;"><span style="color: #1155cc; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; text-decoration-line: underline; text-decoration-skip-ink: none; vertical-align: baseline; white-space-collapse: preserve;">size</a><span style="color: #980000; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;"> of a test<span style="color: #444444; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">. At Google, tests are classified by size. Most tests should be small: they must run in a single process and must not wait on a system or event outside of their process. Increasing the fidelity of a small test is often a good choice if the test stays within these constraints. A healthy test suite also includes medium and large tests, which have higher fidelity since they can use heavyweight dependencies that aren’t feasible to use in small tests, e.g., dependencies that increase execution times or call other processes. </div> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </script> <noscript> <style> @media only screen and (max-width: 600px) { .body { overflow-x: auto; } } @media (max-width: 480px), (max-height: 480px) { .post-content table, .post-content td { width: auto !important } } </style> <div class="body"> <span style="font-family: "Times New Roman", serif; font-size: 12pt; font-style: italic; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">This article was adapted from a Google <a href="http://googletesting.blogspot.com/2007/01/introducing-testing-on-toilet.html" style="text-decoration-line: none;"><span style="color: #1155cc; font-family: "Times New Roman", serif; font-size: 12pt; font-style: italic; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; text-decoration-line: underline; text-decoration-skip-ink: none; vertical-align: baseline; white-space-collapse: preserve;">Testing on the Toilet</a><span style="font-family: "Times New Roman", serif; font-size: 12pt; font-style: italic; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> (TotT) episode. You can download a <a href="https://docs.google.com/document/d/1h2wbaTg2Ve6v9JDQukHsZGqCL45LdLY_xjONPxHLm1w/edit" style="text-decoration-line: none;"><span style="color: #1155cc; font-family: "Times New Roman", serif; font-size: 12pt; font-style: italic; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; text-decoration-line: underline; text-decoration-skip-ink: none; vertical-align: baseline; white-space-collapse: preserve;">printer-friendly version</a><span style="font-family: "Times New Roman", serif; font-size: 12pt; font-style: italic; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> of this TotT episode and post it in your office.By Andrew Trenk and Dillon Bly<span style="color: #444444; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">Replacing your code’s dependencies with mocks can make unit tests easier to write and faster to run. However, <a href="https://testing.googleblog.com/2013/05/testing-on-toilet-dont-overuse-mocks.html" style="text-decoration-line: none;"><span style="color: #1155cc; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; text-decoration-line: underline; text-decoration-skip-ink: none; vertical-align: baseline; white-space-collapse: preserve;">among other problems</a><span style="color: #444444; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">, using mocks can lead to tests that are less effective at catching bugs.<span style="color: #980000; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">The<span style="color: #980000; font-family: "Times New Roman", serif; font-size: 13pt; font-style: italic; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;"> fidelity<span style="color: #980000; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;"> of a test refers to how closely the behavior of the test resembles the behavior of the production code<span style="color: #444444; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">. A test with higher fidelity gives you higher confidence that your code will work properly. <span style="color: #980000; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">When specifying a dependency to use in a test,<span style="color: #444444; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> <span style="color: #980000; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">prefer the highest-fidelity option. <span style="font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">Learn more in the <a href="https://abseil.io/resources/swe-book/html/ch13.html" style="text-decoration-line: none;"><span style="color: #1155cc; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; text-decoration-line: underline; text-decoration-skip-ink: none; vertical-align: baseline; white-space-collapse: preserve;">Test Doubles</a><span style="font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> chapter of the <a href="https://abseil.io/resources/swe-book" style="text-decoration-line: none;"><span style="color: #1155cc; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; text-decoration-line: underline; text-decoration-skip-ink: none; vertical-align: baseline; white-space-collapse: preserve;">Software Engineering at Google</a><span style="font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> book.<ol style="margin-bottom: 0px; margin-top: 0px; padding-inline-start: 48px; text-align: left;"><li><span style="font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">Try to use the real implementation<span style="font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">. <span style="color: #444444; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">This provides the most fidelity, because the code in the implementation will be executed in the test. There may be tradeoffs when using a real implementation: they can be slow, non-deterministic, or difficult to instantiate (e.g., it connects to an external server). Use your judgment to decide if a real implementation is the right choice.</li><li><span style="color: #444444; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"><span style="color: black; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline;">Use a fake if you can’t use the real implementation.<span style="color: #980000; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline;"> A <a href="https://testing.googleblog.com/2013/06/testing-on-toilet-fake-your-way-to.html" style="text-decoration-line: none;"><span style="color: #1155cc; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; text-decoration-line: underline; text-decoration-skip-ink: none; vertical-align: baseline;">fake</a> is a lightweight implementation of an API that behaves similarly to the real implementation, e.g., an in-memory database. A fake ensures a test has high fidelity, but takes effort to write and maintain; e.g., it needs its own tests to ensure that it conforms to the behavior of the real implementation. Typically, the owner of the real implementation creates and maintains the fake. </li><li><span style="color: #444444; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"><span style="color: black; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline;">Use a mock if you can’t use the real implementation or a fake. A mock reduces fidelity, since it doesn’t execute any of the actual implementation of a dependency; its behavior is specified inline in a test (a technique known as stubbing), so it may diverge from the behavior of the real implementation. Mocks provide a basic level of confidence that your code works properly, and can be especially useful when testing a code path that is hard to trigger (e.g., an error condition such as a timeout). (Note: Although “mocks” are objects created using mocking frameworks such as <a href="https://site.mockito.org/" style="text-decoration-line: none;"><span style="color: #1155cc; font-size: 12pt; font-style: italic; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; text-decoration-line: underline; text-decoration-skip-ink: none; vertical-align: baseline;">Mockito</a> or <a href="https://docs.python.org/3/library/unittest.mock.html" style="text-decoration-line: none;"><span style="color: #1155cc; font-size: 12pt; font-style: italic; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; text-decoration-line: underline; text-decoration-skip-ink: none; vertical-align: baseline;">unittest.mock</a>, the same problems will occur if you manually create your own implementation within tests.)</li></ol><div> </div><div><div align="left" dir="ltr"><table style="border-collapse: collapse; border: none;"><colgroup><col width="359"></col><col width="406"></col></colgroup><tbody><tr style="height: 33pt;"><td style="border-bottom: solid #999999 1pt; border-color: rgb(153, 153, 153); border-left: solid #999999 1pt; border-right: solid #999999 1pt; border-style: solid; border-top: solid #999999 1pt; border-width: 1pt; overflow-wrap: break-word; overflow: hidden; padding: 3.6pt; vertical-align: middle;"><span face="Arial, sans-serif" style="font-size: 11pt; font-style: italic; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">A low-fidelity test<span face="Arial, sans-serif" style="font-size: 11pt; font-style: italic; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">: Dependencies are replaced with mocks. Try to avoid this.</td><td style="border-bottom: solid #999999 1pt; border-color: rgb(153, 153, 153); border-left: solid #999999 1pt; border-right: solid #999999 1pt; border-style: solid; border-top: solid #999999 1pt; border-width: 1pt; overflow-wrap: break-word; overflow: hidden; padding: 5pt; vertical-align: top;"><span face="Arial, sans-serif" style="font-size: 11pt; font-style: italic; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">A high-fidelity test:<span face="Arial, sans-serif" style="font-size: 11pt; font-style: italic; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> Dependencies use real implementations or fakes. Prefer this.</td></tr><tr style="height: 0pt;"><td style="background-color: #f4cccc; border-bottom: solid #999999 1pt; border-color: rgb(153, 153, 153); border-left: solid #999999 1pt; border-right: solid #999999 1pt; border-style: solid; border-top: solid #999999 1pt; border-width: 1pt; overflow-wrap: break-word; overflow: hidden; padding: 5pt; vertical-align: top;"><span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">@Mock OrderValidator <span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">validator<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">;<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">@Mock PaymentProcessor <span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">processor<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">; <span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">... ShoppingCart cart =<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> new ShoppingCart(<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;"> validator<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">, <span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">processor<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">);</td><td style="background-color: #d9ead3; border-bottom: solid #999999 1pt; border-color: rgb(153, 153, 153); border-left: solid #999999 1pt; border-right: solid #999999 1pt; border-style: solid; border-top: solid #999999 1pt; border-width: 1pt; overflow-wrap: break-word; overflow: hidden; padding: 5pt; vertical-align: top;"><span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">OrderValidator <span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">validator<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> =<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> createValidator();<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">PaymentProcessor <span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">processor<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> =<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> new FakeProcessor();<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> <span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">...<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;"> <span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">ShoppingCart cart =<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">    new ShoppingCart(<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;"> validator<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">, <span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">processor<span style="background-color: transparent; font-family: "Roboto Mono", monospace; font-size: 10pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">);</td></tr></tbody></table></div></div><span style="color: #980000; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;">Aim for as much fidelity as you can achieve without increasing the <a href="https://abseil.io/resources/swe-book/html/ch11.html#test_size" style="text-decoration-line: none;"><span style="color: #1155cc; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; text-decoration-line: underline; text-decoration-skip-ink: none; vertical-align: baseline; white-space-collapse: preserve;">size</a><span style="color: #980000; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; font-weight: 700; vertical-align: baseline; white-space-collapse: preserve;"> of a test<span style="color: #444444; font-family: "Times New Roman", serif; font-size: 13pt; font-variant-alternates: normal; font-variant-east-asian: normal; font-variant-numeric: normal; font-variant-position: normal; vertical-align: baseline; white-space-collapse: preserve;">. At Google, tests are classified by size. Most tests should be small: they must run in a single process and must not wait on a system or event outside of their process. Increasing the fidelity of a small test is often a good choice if the test stays within these constraints. A healthy test suite also includes medium and large tests, which have higher fidelity since they can use heavyweight dependencies that aren’t feasible to use in small tests, e.g., dependencies that increase execution times or call other processes. </div> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </noscript> </div> </div> <div class='share'> <span class='twitter-custom social-wrapper' data-href='http://twitter.com/share?text=Google Testing Blog:Increase Test Fidelity By Avoiding Mocks&url=https://testing.googleblog.com/2024/02/increase-test-fidelity-by-avoiding-mocks.html&via=googletesting'> <img alt='Share on Twitter' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_twitter_black_24dp.png' width='24'/> <img alt='Share on Facebook' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_facebook_black_24dp.png' width='24'/> </div> <div class='comment-container'>  <a href='https://testing.googleblog.com/2024/02/increase-test-fidelity-by-avoiding-mocks.html#comments' style='font-weight: 500; text-decoration: underline;'>No comments</a> </div> <div class='post-footer'> <div class='cmt_iframe_holder' data-href='https://testing.googleblog.com/2024/02/increase-test-fidelity-by-avoiding-mocks.html' data-viewtype='FILTERED_POSTMOD'></div> <a href='https://plus.google.com/112374322230920073195' rel='author' style='display:none;'> Google </a> <div class='label-footer'> Labels: <a class='label' href='https://testing.googleblog.com/search/label/Andrew%20Trenk' rel='tag'> Andrew Trenk </a> , <a class='label' href='https://testing.googleblog.com/search/label/Dillon%20Bly' rel='tag'> Dillon Bly </a> , <a class='label' href='https://testing.googleblog.com/search/label/TotT' rel='tag'> TotT </a> </div> </div> </div> <div class='post' data-id='6015182196746360165' itemscope='' itemtype='http://schema.org/BlogPosting'> <h2 class='title' itemprop='name'> <a href='https://testing.googleblog.com/2018/06/testing-on-toilet-only-verify-relevant.html' itemprop='url' title='Testing on the Toilet: Only Verify Relevant Method Arguments'> Testing on the Toilet: Only Verify Relevant Method Arguments </a> </h2> <div class='post-header'> <div class='published'> Tuesday, June 26, 2018 </div> </div> <div class='post-body'> <div class='post-content' itemprop='articleBody'> <script type='text/template'> This article was adapted from a <a href="http://googletesting.blogspot.com/2007/01/introducing-testing-on-toilet.html" style="text-decoration-line: none;">Google Testing on the Toilet</a> (TotT) episode. You can download a <a href="https://docs.google.com/document/d/1BxUCm5HuCg2_cq0iSI060iLCSMXzuudb-Ob57MhCJcw/edit" rel="nofollow" style="text-decoration-line: none;">printer-friendly version</a> of this TotT episode and post it in your office. By Dillon Bly What makes this test fragile? <div style="overflow-x: auto;"> <table class="my-bordered-table" style="width: 613px;"><tbody> <tr><td style="background-color: #f4cccc; vertical-align: top; width: 607px;"><pre style="background-color: #f4cccc; border: 0px; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-top: 0px;">@Test public void displayGreeting_showSpecialGreetingOnNewYearsDay() { fakeClock.setTime(NEW_YEARS_DAY); fakeUser.setName("Fake User”); userGreeter.displayGreeting(); // The test will fail if userGreeter.displayGreeting() didn’t call // mockUserPrompter.updatePrompt() with these exact arguments. verify(mockUserPrompter).updatePrompt( "Hi Fake User! Happy New Year!", TitleBar.of("2018-01-01"), PromptStyle.NORMAL); }</pre> </td></tr> </tbody></table> </div> The test specifies exact values for all arguments to mockUserPrompter. These arguments may need to be updated when the code under test is changed, even if the changes are unrelated to the behavior being tested. For example, if additional text is added to TitleBar, every test in the codebase that specifies this argument will need to be updated. In addition, verifying too many arguments makes it difficult to understand what behavior is being tested since it’s not obvious which arguments are important to the test and which are irrelevant. Instead, only verify arguments that affect the correctness of the specific behavior being tested. You can use argument matchers (e.g., any() and contains() in Mockito) to ignore arguments that don't need to be verified: <div style="overflow-x: auto;"> <table class="my-bordered-table" style="width: 613px;"><tbody> <tr><td style="background-color: #d9ead3; vertical-align: top; width: 607px;"><pre style="background-color: #d9ead3; border: 0px; color: black; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-top: 0px;">@Test public void displayGreeting_showSpecialGreetingOnNewYearsDay() { fakeClock.setTime(NEW_YEARS_DAY); userGreeter.displayGreeting(); verify(mockUserPrompter).updatePrompt(contains("Happy New Year!"), any(), any())); }</pre> </td></tr> </tbody></table> </div> Arguments ignored in one test can be verified in other tests. Following this pattern allows us to verify only one behavior per test, which makes tests more readable and more resilient to change. For example, here is a separate test that we might write: <div style="overflow-x: auto;"> <table class="my-bordered-table" style="width: 613px;"><tbody> <tr><td style="background-color: #d9ead3; vertical-align: top; width: 607px;"><pre style="background-color: #d9ead3; border: 0px; color: black; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-top: 0px;">@Test public void displayGreeting_renderUserName() { fakeUser.setName(“Fake User”); userGreeter.displayGreeting(); // Focus on the argument relevant to showing the user's name. verify(mockUserPrompter).updatePrompt(contains("Hi Fake User!"), any(), any()); } </pre> </td></tr> </tbody></table> </div> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </script> <noscript> This article was adapted from a <a href="http://googletesting.blogspot.com/2007/01/introducing-testing-on-toilet.html" style="text-decoration-line: none;">Google Testing on the Toilet</a> (TotT) episode. You can download a <a href="https://docs.google.com/document/d/1BxUCm5HuCg2_cq0iSI060iLCSMXzuudb-Ob57MhCJcw/edit" rel="nofollow" style="text-decoration-line: none;">printer-friendly version</a> of this TotT episode and post it in your office. By Dillon Bly What makes this test fragile? <div style="overflow-x: auto;"> <table class="my-bordered-table" style="width: 613px;"><tbody> <tr><td style="background-color: #f4cccc; vertical-align: top; width: 607px;"><pre style="background-color: #f4cccc; border: 0px; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-top: 0px;">@Test public void displayGreeting_showSpecialGreetingOnNewYearsDay() { fakeClock.setTime(NEW_YEARS_DAY); fakeUser.setName("Fake User”); userGreeter.displayGreeting(); // The test will fail if userGreeter.displayGreeting() didn’t call // mockUserPrompter.updatePrompt() with these exact arguments. verify(mockUserPrompter).updatePrompt( "Hi Fake User! Happy New Year!", TitleBar.of("2018-01-01"), PromptStyle.NORMAL); }</pre> </td></tr> </tbody></table> </div> The test specifies exact values for all arguments to mockUserPrompter. These arguments may need to be updated when the code under test is changed, even if the changes are unrelated to the behavior being tested. For example, if additional text is added to TitleBar, every test in the codebase that specifies this argument will need to be updated. In addition, verifying too many arguments makes it difficult to understand what behavior is being tested since it’s not obvious which arguments are important to the test and which are irrelevant. Instead, only verify arguments that affect the correctness of the specific behavior being tested. You can use argument matchers (e.g., any() and contains() in Mockito) to ignore arguments that don't need to be verified: <div style="overflow-x: auto;"> <table class="my-bordered-table" style="width: 613px;"><tbody> <tr><td style="background-color: #d9ead3; vertical-align: top; width: 607px;"><pre style="background-color: #d9ead3; border: 0px; color: black; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-top: 0px;">@Test public void displayGreeting_showSpecialGreetingOnNewYearsDay() { fakeClock.setTime(NEW_YEARS_DAY); userGreeter.displayGreeting(); verify(mockUserPrompter).updatePrompt(contains("Happy New Year!"), any(), any())); }</pre> </td></tr> </tbody></table> </div> Arguments ignored in one test can be verified in other tests. Following this pattern allows us to verify only one behavior per test, which makes tests more readable and more resilient to change. For example, here is a separate test that we might write: <div style="overflow-x: auto;"> <table class="my-bordered-table" style="width: 613px;"><tbody> <tr><td style="background-color: #d9ead3; vertical-align: top; width: 607px;"><pre style="background-color: #d9ead3; border: 0px; color: black; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-top: 0px;">@Test public void displayGreeting_renderUserName() { fakeUser.setName(“Fake User”); userGreeter.displayGreeting(); // Focus on the argument relevant to showing the user's name. verify(mockUserPrompter).updatePrompt(contains("Hi Fake User!"), any(), any()); } </pre> </td></tr> </tbody></table> </div> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </noscript> </div> </div> <div class='share'> <span class='twitter-custom social-wrapper' data-href='http://twitter.com/share?text=Google Testing Blog:Testing on the Toilet: Only Verify Relevant Method Arguments&url=https://testing.googleblog.com/2018/06/testing-on-toilet-only-verify-relevant.html&via=googletesting'> <img alt='Share on Twitter' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_twitter_black_24dp.png' width='24'/> <img alt='Share on Facebook' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_facebook_black_24dp.png' width='24'/> </div> <div class='comment-container'>  <a href='https://testing.googleblog.com/2018/06/testing-on-toilet-only-verify-relevant.html#comments' style='font-weight: 500; text-decoration: underline;'>No comments</a> </div> <div class='post-footer'> <div class='cmt_iframe_holder' data-href='https://testing.googleblog.com/2018/06/testing-on-toilet-only-verify-relevant.html' data-viewtype='FILTERED_POSTMOD'></div> <a href='https://plus.google.com/112374322230920073195' rel='author' style='display:none;'> Google </a> <div class='label-footer'> Labels: <a class='label' href='https://testing.googleblog.com/search/label/Dillon%20Bly' rel='tag'> Dillon Bly </a> , <a class='label' href='https://testing.googleblog.com/search/label/TotT' rel='tag'> TotT </a> </div> </div> </div> <div class='post' data-id='3797894023961037485' itemscope='' itemtype='http://schema.org/BlogPosting'> <h2 class='title' itemprop='name'> <a href='https://testing.googleblog.com/2017/12/testing-on-toilet-only-verify-state.html' itemprop='url' title='Testing on the Toilet: Only Verify State-Changing Method Calls'> Testing on the Toilet: Only Verify State-Changing Method Calls </a> </h2> <div class='post-header'> <div class='published'> Monday, December 11, 2017 </div> </div> <div class='post-body'> <div class='post-content' itemprop='articleBody'> <script type='text/template'> This article was adapted from a <a href="http://googletesting.blogspot.com/2007/01/introducing-testing-on-toilet.html">Google Testing on the Toilet</a> (TotT) episode. You can download a <a href="https://docs.google.com/document/d/1A0USfjPsmS4fSpgCfunBab8azRIPDTIKi-wRZD1K58k/edit?usp=sharing" rel="nofollow">printer-friendly version</a> of this TotT episode and post it in your office. By Dillon Bly and Andrew Trenk Which lines can be safely removed from this test? <div style="overflow-x: auto;"> <table class="my-bordered-table" style="width: 613px;"><tbody> <tr><td style="background-color: #f4cccc; vertical-align: top; width: 607px;"><pre style="background-color: #f4cccc; border: 0px; color: black; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-top: 0px;">@Test public void addPermissionToDatabase() { new UserAuthorizer(mockUserService, mockPermissionDb).grantPermission(USER, READ_ACCESS); </pre> <pre style="background-color: #f4cccc; border: 0px; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-top: 0px;"> </pre> <pre style="background-color: #f4cccc; border: 0px; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-top: 0px;"> // The test will fail if any of these methods is not called. verify(mockUserService).isUserActive(USER); verify(mockPermissionDb).getPermissions(USER); verify(mockPermissionDb).isValidPermission(READ_ACCESS); verify(mockPermissionDb).addPermission(USER, READ_ACCESS); }</pre> </td></tr> </tbody></table> </div> The answer is that the calls to verify the non-state-changing methods can be removed. Method calls on another object fall into one of two categories: <ul> <li>State-changing: methods that have side effects and change the world outside the code under test, e.g., sendEmail(), saveRecord(), logAccess().</li> <li>Non-state-changing: methods that return information about the world outside the code under test and don't modify anything, e.g., getUser(), findResults(), readFile().</li> </ul> <div> You should usually avoid verifying that non-state-changing methods are called:</div> <div> <ul> <li>It is often redundant: a method call that doesn't change the state of the world is meaningless on its own. The code under test will use the return value of the method call to do other work that you can assert.</li> <li>It makes tests brittle: tests need to be updated whenever method calls change. For example, if a test is expecting mockUserService.isUserActive(USER) to be called, it would fail if the code under test is modified to call user.isActive() instead.</li> <li>It makes tests less readable: the additional assertions in the test make it more difficult to determine which method calls actually affect the state of the world.</li> <li>It gives a false sense of security: just because the code under test called a method does not mean the code under test did the right thing with the method’s return value.</li> </ul> </div> <div dir="ltr" style="line-height: 1.2; margin-bottom: 0pt; margin-top: 10pt;"> Instead of verifying that they are called, use non-state-changing methods to simulate different conditions in tests, e.g., when(mockUserService.isUserActive(USER)).thenReturn(false)<span style="background-color: transparent; color: black; font-family: "times" , "times new roman" , serif; font-style: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">. Then write assertions for the return value of the code under test, or verify state-changing method calls.</div> <div dir="ltr" style="line-height: 1.2; margin-bottom: 0pt; margin-top: 10pt;"> <span style="background-color: transparent; color: black; font-family: "times" , "times new roman" , serif; font-style: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Verifying non-state-changing method calls may be useful if there is no other output you can assert. For example, if your code should be caching an RPC result, you can verify that the method that makes the RPC is called only once.</div> <div dir="ltr" style="line-height: 1.2; margin-bottom: 0pt; margin-top: 10pt;"> With the unnecessary verifications removed, the test looks like this:</div> <div style="overflow-x: auto;"> <table class="my-bordered-table" style="width: 613px;"><tbody> <tr><td style="background-color: #fff2cc; vertical-align: top; width: 607px;"><pre style="background-color: #fff2cc; border: 0px; color: black; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-top: 0px;">@Test public void addPermissionToDatabase() { new UserAuthorizer(mockUserService, mockPermissionDb).grantPermission(USER, READ_ACCESS); </pre> <pre style="background-color: #fff2cc; border: 0px; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-top: 0px;"> </pre> <pre style="background-color: #fff2cc; border: 0px; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-top: 0px;"> // Verify only the state-changing method. verify(mockPermissionDb).addPermission(USER, READ_ACCESS); } </pre> </td></tr> </tbody></table> </div> <div dir="ltr" style="line-height: 1.2; margin-bottom: 0pt; margin-top: 10pt;"> That’s much simpler! But remember that instead of using a mock to verify that a method was called, it would be even better to use a real or <a href="https://testing.googleblog.com/2013/06/testing-on-toilet-fake-your-way-to.html" style="text-decoration-line: none;">fake object</a> to actually execute the method and check that it works properly. For example, the above test could use a fake database to check that the permission exists in the database rather than just verifying that addPermission() was called. You can learn more about this topic in the book <a class="m_5763211666182523148m_-1367602418583969106cremed m_5763211666182523148cremed" data-saferedirecturl="https://www.google.com/url?hl=en&q=http://www.growing-object-oriented-software.com/&source=gmail&ust=1513118358215000&usg=AFQjCNGL6EuV0T86ZLsLyUi4VcPIa8fIVQ" href="http://www.growing-object-oriented-software.com/" style="background-color: white; color: #1155cc; text-decoration-line: none; white-space: normal;" target="_blank">Growing Object-Oriented Software, Guided by Tests</a>. Note that the book uses the terms “command” and “query” instead of “state-changing” and “non-state-changing”.</div> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </script> <noscript> This article was adapted from a <a href="http://googletesting.blogspot.com/2007/01/introducing-testing-on-toilet.html">Google Testing on the Toilet</a> (TotT) episode. You can download a <a href="https://docs.google.com/document/d/1A0USfjPsmS4fSpgCfunBab8azRIPDTIKi-wRZD1K58k/edit?usp=sharing" rel="nofollow">printer-friendly version</a> of this TotT episode and post it in your office. By Dillon Bly and Andrew Trenk Which lines can be safely removed from this test? <div style="overflow-x: auto;"> <table class="my-bordered-table" style="width: 613px;"><tbody> <tr><td style="background-color: #f4cccc; vertical-align: top; width: 607px;"><pre style="background-color: #f4cccc; border: 0px; color: black; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-top: 0px;">@Test public void addPermissionToDatabase() { new UserAuthorizer(mockUserService, mockPermissionDb).grantPermission(USER, READ_ACCESS); </pre> <pre style="background-color: #f4cccc; border: 0px; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-top: 0px;"> </pre> <pre style="background-color: #f4cccc; border: 0px; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-top: 0px;"> // The test will fail if any of these methods is not called. verify(mockUserService).isUserActive(USER); verify(mockPermissionDb).getPermissions(USER); verify(mockPermissionDb).isValidPermission(READ_ACCESS); verify(mockPermissionDb).addPermission(USER, READ_ACCESS); }</pre> </td></tr> </tbody></table> </div> The answer is that the calls to verify the non-state-changing methods can be removed. Method calls on another object fall into one of two categories: <ul> <li>State-changing: methods that have side effects and change the world outside the code under test, e.g., sendEmail(), saveRecord(), logAccess().</li> <li>Non-state-changing: methods that return information about the world outside the code under test and don't modify anything, e.g., getUser(), findResults(), readFile().</li> </ul> <div> You should usually avoid verifying that non-state-changing methods are called:</div> <div> <ul> <li>It is often redundant: a method call that doesn't change the state of the world is meaningless on its own. The code under test will use the return value of the method call to do other work that you can assert.</li> <li>It makes tests brittle: tests need to be updated whenever method calls change. For example, if a test is expecting mockUserService.isUserActive(USER) to be called, it would fail if the code under test is modified to call user.isActive() instead.</li> <li>It makes tests less readable: the additional assertions in the test make it more difficult to determine which method calls actually affect the state of the world.</li> <li>It gives a false sense of security: just because the code under test called a method does not mean the code under test did the right thing with the method’s return value.</li> </ul> </div> <div dir="ltr" style="line-height: 1.2; margin-bottom: 0pt; margin-top: 10pt;"> Instead of verifying that they are called, use non-state-changing methods to simulate different conditions in tests, e.g., when(mockUserService.isUserActive(USER)).thenReturn(false)<span style="background-color: transparent; color: black; font-family: "times" , "times new roman" , serif; font-style: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">. Then write assertions for the return value of the code under test, or verify state-changing method calls.</div> <div dir="ltr" style="line-height: 1.2; margin-bottom: 0pt; margin-top: 10pt;"> <span style="background-color: transparent; color: black; font-family: "times" , "times new roman" , serif; font-style: normal; font-weight: 400; text-decoration: none; vertical-align: baseline; white-space: pre-wrap;">Verifying non-state-changing method calls may be useful if there is no other output you can assert. For example, if your code should be caching an RPC result, you can verify that the method that makes the RPC is called only once.</div> <div dir="ltr" style="line-height: 1.2; margin-bottom: 0pt; margin-top: 10pt;"> With the unnecessary verifications removed, the test looks like this:</div> <div style="overflow-x: auto;"> <table class="my-bordered-table" style="width: 613px;"><tbody> <tr><td style="background-color: #fff2cc; vertical-align: top; width: 607px;"><pre style="background-color: #fff2cc; border: 0px; color: black; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-top: 0px;">@Test public void addPermissionToDatabase() { new UserAuthorizer(mockUserService, mockPermissionDb).grantPermission(USER, READ_ACCESS); </pre> <pre style="background-color: #fff2cc; border: 0px; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-top: 0px;"> </pre> <pre style="background-color: #fff2cc; border: 0px; margin: 0px; padding-bottom: 0px; padding-left: 0px; padding-top: 0px;"> // Verify only the state-changing method. verify(mockPermissionDb).addPermission(USER, READ_ACCESS); } </pre> </td></tr> </tbody></table> </div> <div dir="ltr" style="line-height: 1.2; margin-bottom: 0pt; margin-top: 10pt;"> That’s much simpler! But remember that instead of using a mock to verify that a method was called, it would be even better to use a real or <a href="https://testing.googleblog.com/2013/06/testing-on-toilet-fake-your-way-to.html" style="text-decoration-line: none;">fake object</a> to actually execute the method and check that it works properly. For example, the above test could use a fake database to check that the permission exists in the database rather than just verifying that addPermission() was called. You can learn more about this topic in the book <a class="m_5763211666182523148m_-1367602418583969106cremed m_5763211666182523148cremed" data-saferedirecturl="https://www.google.com/url?hl=en&q=http://www.growing-object-oriented-software.com/&source=gmail&ust=1513118358215000&usg=AFQjCNGL6EuV0T86ZLsLyUi4VcPIa8fIVQ" href="http://www.growing-object-oriented-software.com/" style="background-color: white; color: #1155cc; text-decoration-line: none; white-space: normal;" target="_blank">Growing Object-Oriented Software, Guided by Tests</a>. Note that the book uses the terms “command” and “query” instead of “state-changing” and “non-state-changing”.</div> <meta content='https://plus.google.com/116899029375914044550' itemprop='url'/> </noscript> </div> </div> <div class='share'> <span class='twitter-custom social-wrapper' data-href='http://twitter.com/share?text=Google Testing Blog:Testing on the Toilet: Only Verify State-Changing Method Calls&url=https://testing.googleblog.com/2017/12/testing-on-toilet-only-verify-state.html&via=googletesting'> <img alt='Share on Twitter' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_twitter_black_24dp.png' width='24'/> <img alt='Share on Facebook' height='24' src='https://www.gstatic.com/images/icons/material/system/2x/post_facebook_black_24dp.png' width='24'/> </div> <div class='comment-container'>  <a href='https://testing.googleblog.com/2017/12/testing-on-toilet-only-verify-state.html#comments' style='font-weight: 500; text-decoration: underline;'>3 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style='margin-top: -16px;' width='92'/> </a> <ul> <li> <a href='//www.google.com/'> Google </a> </li> <li> <a href='//www.google.com/policies/privacy/'> Privacy </a> </li> <li> <a href='//www.google.com/policies/terms/'> Terms </a> </li> </ul> </div> </div> <script type='text/javascript'> //<![CDATA[ // Social sharing popups. var postEl = document.getElementsByClassName('social-wrapper'); var postCount = postEl.length; for(i=0; i<postCount;i++){ postEl[i].addEventListener("click", function(event){ var postUrl = this.getAttribute("data-href"); window.open( postUrl,'popUpWindow','height=500,width=500,left=10,top=10,resizable=yes,scrollbars=yes,toolbar=yes,menubar=no,location=no,directories=no,status=yes'); });} //]]> </script> <script type='text/javascript'> //<![CDATA[ var BreakpointHandler = function() { this.initted = false; this.isHomePage = false; this.isMobile = false; }; BreakpointHandler.prototype.finalizeSummary = function(summaryHtml, lastNode) { // Use $.trim for IE8 compatibility summaryHtml = $.trim(summaryHtml).replace(/( |\s)+$/,''); if (lastNode.nodeType == 3) { var lastChar = summaryHtml.slice(-1); if (!lastChar.match(/[.”"?]/)) { if (!lastChar.match(/[A-Za-z]/)) { summaryHtml = summaryHtml.slice(0, -1); } summaryHtml += ' ...'; } } else if (lastNode.nodeType == 1 && (lastNode.nodeName == 'I' || lastNode.nodeName == 'A')) { summaryHtml += ' ...'; } return summaryHtml; }; BreakpointHandler.prototype.generateSummaryFromContent = function(content, numWords) { var seenWords = 0; var summaryHtml = ''; for (var i=0; i < content.childNodes.length; i++) { var node = content.childNodes[i]; var nodeText; if (node.nodeType == 1) { if (node.hasAttribute('data-about-pullquote')) { continue; } nodeText = node.textContent; if (nodeText === undefined) { // innerText for IE8 nodeText = node.innerText; } if (node.nodeName == 'DIV' || node.nodeName == 'B') { // Don't end early if we haven't seen enough words. if (seenWords < 10) { continue; } if (i > 0) { 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makeInsecureImageRegex(BreakpointHandler.KNOWN_HTTPS_HOSTS); this.sslImageCurrentDomainRegex = makeInsecureImageRegex([window.location.hostname]); this.detect(); this.initContent(); this.initted = true; } }; BreakpointHandler.KNOWN_HTTPS_HOSTS = [ "www.google.org", "www.google.com", "services.google.com", "blogger.com", "draft.blogger.com", "www.blogger.com", "photos1.blogger.com", "photos2.blogger.com", "photos3.blogger.com", "blogblog.com", "img1.blogblog.com", "img2.blogblog.com", "www.blogblog.com", "www1.blogblog.com", "www2.blogblog.com", "0.bp.blogspot.com", "1.bp.blogspot.com", "2.bp.blogspot.com", "3.bp.blogspot.com", "4.bp.blogspot.com", "lh3.googleusercontent.com", "lh4.googleusercontent.com", "lh5.googleusercontent.com", "lh6.googleusercontent.com", "themes.googleusercontent.com", ]; BreakpointHandler.prototype.rewriteForSSL = function(html) { // Handle HTTP -> HTTPS source replacement of images, movies, and other embedded content. return html.replace(this.sslImageRegex, '$1https://$4') .replace(this.sslImageCurrentDomainRegex, '$1//$4') .replace(/(<(embed|iframe)[^>]+?src=("|'))http:\/\/([^"']*?(youtube|picasaweb\.google)\.com)/g, '$1https://$4') // Slideshow SWF takes a image host, so we need to rewrite that parameter. .replace(/(<embed[^>]+?feed=http(?=[^s]))/g, '$1s'); }; $(document).ready(function() { var handler = new BreakpointHandler(); handler.process(); // Top-level navigation. $(".BlogArchive .tab").click(function(ev) { ev.preventDefault(); $(this).parent().toggleClass('active'); $(this).siblings().slideToggle(300); }); $(".Label .tab").click(function(ev) { ev.preventDefault(); $(this).parent().toggleClass('active'); $(this).siblings().slideToggle(300); }); // Blog archive year expansion. $('.BlogArchive .intervalToggle').click(function(ev) { ev.preventDefault(); if ($(this).parent().hasClass('collapsed')) { $(this).parent().removeClass('collapsed'); $(this).parent().addClass('expanded'); } else { $(this).parent().removeClass('expanded'); 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= 0; devsite.expandLeftNav.chekovEnabled_ = false; devsite.expandLeftNav.init = function () { devsite.expandLeftNav.chekovEnabled_ = true; var navElement; if (devsite.expandLeftNav.chekovEnabled_) { navElement = $('.devsite-nav-responsive'); } else { navElement = $('.devsite-section-nav-responsive'); } this.drawerWidth = parseInt(navElement.css('width')); navElement.css({ 'left': -(this.drawerWidth) }); var expandButton = $('.devsite-expand-section-nav'); expandButton.click(function () { devsite.expandLeftNav.handleNavigationOpened(); }); navElement.find('.devsite-nav-responsive-forward').click( devsite.expandLeftNav.openPanel); navElement.find('.devsite-nav-responsive-back').click( devsite.expandLeftNav.closePanel); if ($('.devsite-nav-responsive-tabs-panel + ' + '.devsite-nav-responsive-sidebar-panel').length) { devsite.expandLeftNav.openPanel(); } }; devsite.expandLeftNav.handleNavigationOpened = function (opt_noAnimate) { var mask; if (devsite.expandLeftNav.chekovEnabled_) { var nav = $('.devsite-nav-responsive'); if (opt_noAnimate) { nav.addClass('devsite-nav-responsive-no-animate'); mask = devsite.devsite.showSiteMask(0); } else { mask = devsite.devsite.showSiteMask(); } nav.addClass('devsite-nav-responsive-open'); } else { devsite.expandLeftNav.lastState_ = devsite.sticky.currentState; devsite.sticky.setState(devsite.sticky.state.COLLAPSED_HEADER); var headerHeight = devsite.sticky.getHeaderHeight() - devsite.sticky.desiredMargin; var drawerHeight = $(window).height() - headerHeight; mask = devsite.devsite.showArticleMask(); $('.devsite-section-nav-responsive').css({ 'height': drawerHeight, 'left': '0', 'top': headerHeight, 'visibility': 'visible' }).focus(); } $(mask).click(devsite.expandLeftNav.handleNavigationClosed); $(document).on('keydown.escape', function (e) { if (e.keyCode == $.ui.keyCode.ESCAPE) { devsite.expandLeftNav.handleNavigationClosed(); $(document).off('keydown.escape'); } }); }; devsite.expandLeftNav.getScrollTop = function () { return $(window).scrollTop(); }; devsite.expandLeftNav.handleNavigationClosed = function () { var nav; if (devsite.expandLeftNav.chekovEnabled_) { nav = $('.devsite-nav-responsive'); devsite.devsite.hideSiteMask(); nav.removeClass('devsite-nav-responsive-open ' + 'devsite-nav-responsive-no-animate'); } else { nav = $('.devsite-section-nav-responsive'); devsite.devsite.hideArticleMask(); devsite.sticky.setState(devsite.expandLeftNav.lastState_); nav .css('left', -(devsite.expandLeftNav.drawerWidth)) .one('transitionend', function () { nav.css('visibility', 'hidden'); }); } nav.scrollTop(0); }; devsite.expandLeftNav.openPanel = function () { var parentPanel = $('.devsite-nav-responsive-tabs-panel'); var childPanel = $('.devsite-nav-responsive-sidebar-panel'); childPanel.show(); parentPanel .addClass('devsite-nav-responsive-transition') .addClass('devsite-nav-responsive-transform') .one('transitionend', function () { childPanel .removeClass('devsite-nav-responsive-transition') .removeClass('devsite-nav-responsive-transform'); parentPanel.hide(); }); setTimeout(function () { childPanel .addClass('devsite-nav-responsive-transition') .addClass('devsite-nav-responsive-transform'); }, 1); }; devsite.expandLeftNav.closePanel = function () { var parentPanel = $('.devsite-nav-responsive-tabs-panel'); var childPanel = $('.devsite-nav-responsive-sidebar-panel'); childPanel .removeClass('devsite-nav-responsive-transition') .addClass('devsite-nav-responsive-transform'); parentPanel .show() .removeClass('devsite-nav-responsive-transition') .addClass('devsite-nav-responsive-transform'); setTimeout(function () { parentPanel .addClass('devsite-nav-responsive-transition') .removeClass('devsite-nav-responsive-transform'); childPanel .addClass('devsite-nav-responsive-transition') .removeClass('devsite-nav-responsive-transform') .one('transitionend', function () { childPanel.hide(); parentPanel.removeClass('devsite-nav-responsive-transition'); }); }, 1); }; 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