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<article class="p-4 col-lg-10 col-md-10 col-sm-12">
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<section id="testing-codeql-queries-in-visual-studio-code">
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<span id="id1"></span><h1>Testing CodeQL queries in Visual Studio Code<a class="headerlink" href="#testing-codeql-queries-in-visual-studio-code" title="Link to this heading">¶</a></h1>
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<p>You can run unit tests for CodeQL queries using the Visual Studio Code extension.</p>
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<section id="about-testing-queries-in-vs-code">
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<h2>About testing queries in VS Code<a class="headerlink" href="#about-testing-queries-in-vs-code" title="Link to this heading">¶</a></h2>
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<p>To ensure that your CodeQL queries produce the expected results, you can run tests that compare the expected query results with the actual results.</p>
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<p>The CodeQL extension automatically prompts VS Code to install the Test Explorer extension as a dependency. The Test Explorer displays any workspace folders with a name ending in <code class="docutils literal notranslate"><span class="pre">-tests</span></code> and provides a UI for exploring and running tests in those folders.</p>
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<p>For more information about how CodeQL tests work, see “<a class="reference internal" href="../codeql-cli/testing-custom-queries.html#testing-custom-queries"><span class="std std-ref">Testing custom queries</span></a>” in the CLI help.</p>
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</section>
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<section id="testing-the-results-of-your-queries">
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<h2>Testing the results of your queries<a class="headerlink" href="#testing-the-results-of-your-queries" title="Link to this heading">¶</a></h2>
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<ol class="arabic">
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<li><p>Open the Test Explorer view in the sidebar.</p>
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<a class="reference internal image-reference" href="../_images/open-test-explorer.png"><img alt="Open the Test Explorer view" src="../_images/open-test-explorer.png" style="width: 350px;" /></a>
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<li><p>To run a specific test, hover over the file or folder name and click the play button. To run all tests in your workspace, click the play button at the top of the view. If a test takes too long to run, you can click the stop button at the top of the view to cancel the test.</p></li>
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<li><p>The icons show whether a test passed or failed. If it failed, right-click the failed test and click <strong>CodeQL: Show Test Output Differences</strong> to display the differences between the expected output and the actual output.</p>
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<a class="reference internal image-reference" href="../_images/show-test-diff.png"><img alt="Show test output differences" src="../_images/show-test-diff.png" style="width: 400px;" /></a>
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<li><p>Compare the results. If you want to update the test with the actual output, click <strong>CodeQL: Accept Test Output</strong>.</p></li>
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</ol>
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</section>
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<section id="monitoring-the-performance-of-your-queries">
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<h2>Monitoring the performance of your queries<a class="headerlink" href="#monitoring-the-performance-of-your-queries" title="Link to this heading">¶</a></h2>
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<p>Query performance is important when you want to run a query on large databases, or as part of your continuous integration system.</p>
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<p>If you want to examine query performance, enable the <strong>Running Queries: Debug</strong> setting to include timing and tuple counts. This is shown in the logs in the CodeQL Query Server tab of the Output view. The tuple count is useful because it indicates the size of the <a class="reference internal" href="../ql-language-reference/predicates.html#predicates"><span class="std std-ref">predicates</span></a> computed by the query.</p>
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<p>When a query is evaluated, the query server caches the predicates that it calculates. So when you want to compare the performance of two evaluations, you should clear the query server’s cache before each run (<strong>CodeQL: Clear Cache</strong> command). This ensures that you’re comparing equivalent data.</p>
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<p>For more information, see “<a class="reference internal" href="../writing-codeql-queries/troubleshooting-query-performance.html#troubleshooting-query-performance"><span class="std std-ref">Troubleshooting query performance</span></a>” and “<a class="reference internal" href="../ql-language-reference/evaluation-of-ql-programs.html#evaluation-of-ql-programs"><span class="std std-ref">Evaluation of QL programs</span></a>.”</p>
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</section>
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<section id="further-reading">
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<h2>Further reading<a class="headerlink" href="#further-reading" title="Link to this heading">¶</a></h2>
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<ul class="simple">
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<li><p>“<a class="reference internal" href="../codeql-cli/testing-custom-queries.html#testing-custom-queries"><span class="std std-ref">Testing custom queries</span></a>”</p></li>
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