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<article class="p-4 col-lg-10 col-md-10 col-sm-12">
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<section id="query-reference-files">
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<span id="id1"></span><h1>Query reference files<a class="headerlink" href="#query-reference-files" title="Link to this heading">¶</a></h1>
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<p>A query reference file is text file that defines the location of one query to test.</p>
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<p>You use a query reference file when you want to tell the <code class="docutils literal notranslate"><span class="pre">test</span> <span class="pre">run</span></code> subcommand
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to run a query that’s not part of a test directory.
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There are two ways to specify queries that you want to run as tests:</p>
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<ol class="arabic simple">
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<li><p>Use a query reference file to specify the location of a query to test.
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This is useful when you create tests for alert and path queries that
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are intended to identify problems in real codebases. You might create
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several directories of test code, each focusing on different
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aspects of the query. Then you would add a query reference file to
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each directory of test code, to specify the query to test.</p></li>
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<li><p>Add the query directly to a directory of tests.
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These is typically useful when you’re writing queries explicitly to test the behavior
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of QL libraries. Often these queries contain just a few calls to library predicates,
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wrapping them in a <code class="docutils literal notranslate"><span class="pre">select</span></code> statement so their output can be tested.</p></li>
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</ol>
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<section id="defining-a-query-reference-file">
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<h2>Defining a query reference file<a class="headerlink" href="#defining-a-query-reference-file" title="Link to this heading">¶</a></h2>
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<p>Each query reference file, <code class="docutils literal notranslate"><span class="pre">.qlref</span></code>, contains a single line that defines
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where to find one query. The location must be defined relative
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to the root of the QL pack that contains the query.
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Usually, this is a QL pack specified by the <code class="docutils literal notranslate"><span class="pre">libraryPathDependencies</span></code> for the test pack.</p>
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<p>You should use forward slashes in the path on all operating
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systems to ensure compatibility between systems.</p>
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<section id="example">
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<h3>Example<a class="headerlink" href="#example" title="Link to this heading">¶</a></h3>
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<p>A query reference file to test a JavaScript alert query:
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<a class="reference external" href="https://github.com/github/codeql/blob/main/javascript/ql/test/query-tests/AngularJS/DeadAngularJSEventListener/DeadAngularJSEventListener.qlref">DeadAngularJSEventListener.qlref</a></p>
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<p>The <a class="reference external" href="https://github.com/github/codeql/blob/main/javascript/ql/test/qlpack.yml">QL pack</a>
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for the <code class="docutils literal notranslate"><span class="pre">javascript/ql/test</span></code> directory defines the <code class="docutils literal notranslate"><span class="pre">codeql-javascript</span></code> queries as
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a dependency. So the query reference file defines the location of the query relative
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to the <code class="docutils literal notranslate"><span class="pre">codeql-javascript</span></code> QL pack:</p>
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<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>AngularJS/DeadAngularJSEventListener.ql
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</pre></div>
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<p>For another example, see <a class="reference internal" href="testing-custom-queries.html"><span class="doc">Testing custom queries</span></a>.</p>
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