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| author | Indrajith K L | 2022-12-03 17:00:20 +0530 |
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| committer | Indrajith K L | 2022-12-03 17:00:20 +0530 |
| commit | f5c4671bfbad96bf346bd7e9a21fc4317b4959df (patch) | |
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id="testing-a-parser"> +<span id="testing-parser"></span><h1>Testing a parser<a class="headerlink" href="#testing-a-parser" title="Permalink to this headline">¶</a></h1> +<div class="contents local topic" id="table-of-contents"> +<p class="topic-title"><cite>Table of contents</cite></p> +<ul class="simple"> +<li><p><a class="reference internal" href="#units-test-facility" id="id1"><em>Units</em> test facility</a></p> +<ul> +<li><p><a class="reference internal" href="#how-to-write-a-test-case" id="id2">How to write a test case</a></p></li> +<li><p><a class="reference internal" href="#note-for-importing-a-test-case-from-test-directory" id="id3">Note for importing a test case from Test directory</a></p></li> +<li><p><a class="reference internal" href="#example-of-files" id="id4">Example of files</a></p></li> +<li><p><a class="reference internal" href="#how-to-run-unit-tests" id="id5">How to run unit tests</a></p></li> +<li><p><a class="reference internal" href="#example-of-running" id="id6">Example of running</a></p></li> +<li><p><a class="reference internal" href="#running-unit-tests-for-specific-languages" id="id7">Running unit tests for specific languages</a></p></li> +<li><p><a class="reference internal" href="#gathering-test-cases-for-known-bugs" id="id8">Gathering test cases for known bugs</a></p></li> +<li><p><a class="reference internal" href="#running-under-valgrind-and-timeout" id="id9">Running under valgrind and timeout</a></p></li> +<li><p><a class="reference internal" href="#categories" id="id10">Categories</a></p></li> +<li><p><a class="reference internal" href="#finding-minimal-bad-input" id="id11">Finding minimal bad input</a></p></li> +<li><p><a class="reference internal" href="#acknowledgments" id="id12">Acknowledgments</a></p></li> +</ul> +</li> +<li><p><a class="reference internal" href="#reviewing-the-result-of-units-test" id="id13">Reviewing the result of Units test</a></p></li> +<li><p><a class="reference internal" href="#semi-fuzz-fuzz-testing" id="id14">Semi-fuzz(<em>Fuzz</em>) testing</a></p></li> +<li><p><a class="reference internal" href="#noise-testing" id="id15"><em>Noise</em> testing</a></p></li> +<li><p><a class="reference internal" href="#chop-and-slap-testing" id="id16"><em>Chop</em> and <em>slap</em> testing</a></p></li> +<li><p><a class="reference internal" href="#input-validation-for-units" id="id17">Input validation for <em>Units</em></a></p> +<ul> +<li><p><a class="reference internal" href="#how-to-run-an-example-session-of-input-validation" id="id18">How to run an example session of input validation</a></p></li> +<li><p><a class="reference internal" href="#validator-file" id="id19"><em>validator</em> file</a></p></li> +<li><p><a class="reference internal" href="#validator-command" id="id20">validator command</a></p></li> +</ul> +</li> +<li><p><a class="reference internal" href="#testing-examples-in-language-specific-man-pages" id="id21">Testing examples in language specific man pages</a></p></li> +</ul> +</div> +<p>It is difficult for us to know syntax of all languages supported in ctags. Test +facility and test cases are quite important for maintaining ctags with limited +resources.</p> +<section id="units-test-facility"> +<span id="units"></span><h2><a class="toc-backref" href="#id1"><em>Units</em> test facility</a><a class="headerlink" href="#units-test-facility" title="Permalink to this headline">¶</a></h2> +<dl class="field-list simple"> +<dt class="field-odd">Maintainer</dt> +<dd class="field-odd"><p>Masatake YAMATO <<a class="reference external" href="mailto:yamato%40redhat.com">yamato<span>@</span>redhat<span>.</span>com</a>></p> +</dd> +</dl> +<hr class="docutils" /> +<p><strong>Test facility</strong></p> +<p>Exuberant Ctags has a test facility. The test case were <em>Test</em> +directory. So Here I call it <em>Test</em>.</p> +<p>Main aim of the facility is detecting regression. All files under Test +directory are given as input for old and new version of ctags +commands. The output tags files of both versions are compared. If any +difference is found the check fails. <em>Test</em> expects the older ctags +binary to be correct.</p> +<p>This expectation is not always met. Consider that a parser for a new +language is added. You may want to add a sample source code for that +language to <em>Test</em>. An older ctags version is unable to generate a +tags file for that sample code, but the newer ctags version does. At +this point a difference is found and <em>Test</em> reports failure.</p> +<p><strong>Units facility</strong></p> +<p>The units test facility (<em>Units</em>) I describe here takes a different +approach. An input file and an expected output file are given by a +contributor of a language parser. The units test facility runs ctags +command with the input file and compares its output and the expected +output file. The expected output doesn’t depend on ctags.</p> +<p>If a contributor sends a patch which may improve a language parser, +and if a reviewer is not familiar with that language, s/he cannot +evaluate it.</p> +<p><em>Unit</em> test files, the pair of input file and expected output file may +be able to explain the intent of patch well; and may help the +reviewer.</p> +<section id="how-to-write-a-test-case"> +<h3><a class="toc-backref" href="#id2">How to write a test case</a><a class="headerlink" href="#how-to-write-a-test-case" title="Permalink to this headline">¶</a></h3> +<p>The test facility recognizes an input file and an expected +output file by patterns of file name. Each test case should +have its own directory under Units directory.</p> +<p><em>Units/TEST/input.*</em> <strong>requisite</strong></p> +<blockquote> +<div><p>Input file name must have a <em>input</em> as basename. <em>TEST</em> +part should explain the test case well.</p> +</div></blockquote> +<p><em>Units/TEST/input[-_][0-9].*</em> <em>Units/TEST/input[-_][0-9][-_]*.*</em> <strong>optional</strong></p> +<blockquote> +<div><p>Optional input file names. They are put next to <em>input.*</em> in +testing command line.</p> +</div></blockquote> +<p><em>Units/TEST/expected.tags</em> <strong>optional</strong></p> +<blockquote> +<div><p>Expected output file must have a name <em>expected.tags</em>. It +should be the same directory of the input file.</p> +<p>If this file is not given, the exit status of ctags process +is just checked; the output is ignored.</p> +<p>If you want to test etags output (specified with <code class="docutils literal notranslate"><span class="pre">-e</span></code> ), +Use <strong>.tags-e</strong> as suffix instead of <strong>.tags</strong>. +In such a case you don’t have to write <code class="docutils literal notranslate"><span class="pre">-e</span></code> to <code class="docutils literal notranslate"><span class="pre">args.ctags</span></code>. +The test facility sets <code class="docutils literal notranslate"><span class="pre">-e</span></code> automatically.</p> +<p>If you want to test cross reference output (specified with <code class="docutils literal notranslate"><span class="pre">-x</span></code> ), +Use <strong>.tags-x</strong> as suffix instead of <strong>.tags</strong>. +In such a case you don’t have to write <code class="docutils literal notranslate"><span class="pre">-x</span></code> to <code class="docutils literal notranslate"><span class="pre">args.ctags</span></code>. +The test facility sets <code class="docutils literal notranslate"><span class="pre">-x</span></code> automatically.</p> +<p>If you want to test json output (specified with <code class="docutils literal notranslate"><span class="pre">--output-format=json</span></code> ), +Use <strong>.tags-json</strong> as suffix instead of <strong>.tags</strong>. +In such a case you don’t have to write <code class="docutils literal notranslate"><span class="pre">--output-format=json</span></code> to <code class="docutils literal notranslate"><span class="pre">args.ctags</span></code>, +and add <code class="docutils literal notranslate"><span class="pre">json</span></code> to <code class="docutils literal notranslate"><span class="pre">features</span></code> as described below. +The test facility sets the option and the feature automatically.</p> +</div></blockquote> +<p><em>Units/TEST/args.ctags</em> <strong>optional</strong></p> +<blockquote> +<div><p><code class="docutils literal notranslate"><span class="pre">-o</span> <span class="pre">-</span></code> is used as default optional argument when running a +unit test ctags. If you want to add more options, enumerate +options in <strong>args.ctags</strong> file.</p> +<p>Remember you have to put one option in one line; don’t +put multiple options to one line. Multiple options in +one line doesn’t work.</p> +</div></blockquote> +<p><em>Units/TEST/filter</em> <strong>optional</strong></p> +<blockquote> +<div><p>You can rearrange the output of ctags with this command +before comparing with <em>executed.tags</em>. +This command is invoked with no argument. The output +ctags is given via stdin. Rearrange data should be +written to stdout.</p> +</div></blockquote> +<p><em>Units/TEST/features</em> <strong>optional</strong></p> +<blockquote> +<div><p>If a unit test case requires special features of ctags, +enumerate them in this file line by line. If a target ctags +doesn’t have one of the features, the test is skipped.</p> +<p>If a file line is started with <code class="docutils literal notranslate"><span class="pre">!</span></code>, the effect is inverted; +if a target ctags has the feature specified with <code class="docutils literal notranslate"><span class="pre">!</span></code>, the +test is skipped.</p> +<p>All features built-in can be listed with passing +<code class="docutils literal notranslate"><span class="pre">--list-features</span></code> to ctags.</p> +</div></blockquote> +<p><em>Units/TEST/languages</em> <strong>optional</strong></p> +<blockquote> +<div><p>If a unit test case requires that language parsers are enabled/available, +enumerate them in this file line by line. If one of them is +disabled/unavailable, the test is skipped.</p> +<p>language parsers enabled/available can be checked with passing +<code class="docutils literal notranslate"><span class="pre">--list-languages</span></code> to ctags.</p> +</div></blockquote> +</section> +<section id="note-for-importing-a-test-case-from-test-directory"> +<h3><a class="toc-backref" href="#id3">Note for importing a test case from Test directory</a><a class="headerlink" href="#note-for-importing-a-test-case-from-test-directory" title="Permalink to this headline">¶</a></h3> +<p>I think all test cases under Test directory should be converted to +Units.</p> +<p>If you convert use following TEST name convention.</p> +<ul class="simple"> +<li><p>use <em>.t</em> instead of <em>.d</em> as suffix for the name</p></li> +</ul> +<p>Here is an example:</p> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Test</span><span class="o">/</span><span class="n">simple</span><span class="o">.</span><span class="n">sh</span> +</pre></div> +</div> +<p>This should be:</p> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Units</span><span class="o">/</span><span class="n">simple</span><span class="o">.</span><span class="n">sh</span><span class="o">.</span><span class="n">t</span> +</pre></div> +</div> +<p>With this name convention we can track which test case is converted or +not.</p> +</section> +<section id="example-of-files"> +<h3><a class="toc-backref" href="#id4">Example of files</a><a class="headerlink" href="#example-of-files" title="Permalink to this headline">¶</a></h3> +<p>See <a class="reference external" href="https://github.com/universal-ctags/ctags/tree/master/Units/parser-c.r/c-sample.d">Units/parser-c.r/c-sample.d</a>.</p> +</section> +<section id="how-to-run-unit-tests"> +<h3><a class="toc-backref" href="#id5">How to run unit tests</a><a class="headerlink" href="#how-to-run-unit-tests" title="Permalink to this headline">¶</a></h3> +<p><em>test</em> make target:</p> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ make units +</pre></div> +</div> +<p>The result of unit tests is reported by lines. You can specify +test cases with <code class="docutils literal notranslate"><span class="pre">UNITS=</span></code>.</p> +<p>An example to run <em>vim-command.d</em> only:</p> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ make units UNITS=vim-command +</pre></div> +</div> +<p>Another example to run <em>vim-command.d</em> and <em>parser-python.r/bug1856363.py.d</em>:</p> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ make units UNITS=vim-command,bug1856363.py +</pre></div> +</div> +<p>During testing <em>OUTPUT.tmp</em>, <em>EXPECTED.tmp</em> and <em>DIFF.tmp</em> files are +generated for each test case directory. These are removed when the +unit test is <strong>passed</strong>. If the result is <strong>FAILED</strong>, it is kept for +debugging. Following command line can clean up these generated files +at once:</p> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ make clean-units +</pre></div> +</div> +<p>Other than <strong>FAILED</strong> and <strong>passed</strong> two types of result are +defined.</p> +<p><strong>skipped</strong></p> +<blockquote> +<div><p>means running the test case is skipped in some reason.</p> +</div></blockquote> +<p><strong>failed (KNOWN bug)</strong></p> +<blockquote> +<div><p>means the result was failed but the failure is expected. +See “<a class="reference internal" href="#gathering-test"><span class="std std-ref">Gathering test cases for known bugs</span></a>”.</p> +</div></blockquote> +</section> +<section id="example-of-running"> +<h3><a class="toc-backref" href="#id6">Example of running</a><a class="headerlink" href="#example-of-running" title="Permalink to this headline">¶</a></h3> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ make units +Category: ROOT +------------------------------------------------------------------------- +Testing 1795612.js as JavaScript passed +Testing 1850914.js as JavaScript passed +Testing 1878155.js as JavaScript passed +Testing 1880687.js as JavaScript passed +Testing 2023624.js as JavaScript passed +Testing 3184782.sql as SQL passed +... +</pre></div> +</div> +</section> +<section id="running-unit-tests-for-specific-languages"> +<h3><a class="toc-backref" href="#id7">Running unit tests for specific languages</a><a class="headerlink" href="#running-unit-tests-for-specific-languages" title="Permalink to this headline">¶</a></h3> +<p>You can run only the tests for specific languages by setting +<code class="docutils literal notranslate"><span class="pre">LANGUAGES</span></code> to parsers as reported by +<code class="docutils literal notranslate"><span class="pre">ctags</span> <span class="pre">--list-languages</span></code>:</p> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">make</span> <span class="n">units</span> <span class="n">LANGUAGES</span><span class="o">=</span><span class="n">PHP</span><span class="p">,</span><span class="n">C</span> +</pre></div> +</div> +<p>Multiple languages can be selected using a comma separated list.</p> +</section> +<section id="gathering-test-cases-for-known-bugs"> +<span id="gathering-test"></span><h3><a class="toc-backref" href="#id8">Gathering test cases for known bugs</a><a class="headerlink" href="#gathering-test-cases-for-known-bugs" title="Permalink to this headline">¶</a></h3> +<p>When we meet a bug, it is an important development activity to make a small test +case that triggers the bug. +Even the bug cannot be fixed in soon, +the test case is an important result of work. Such result should +be merged to the source tree. However, we don’t love <strong>FAILED</strong> +message, too. What we should do?</p> +<p>In such a case, merge as usually but use <em>.b</em> as suffix for +the directory of test case instead of <em>.d</em>.</p> +<p><code class="docutils literal notranslate"><span class="pre">parser-autoconf.r/nested-block.ac.b/</span></code> is an example +of <code class="docutils literal notranslate"><span class="pre">.b``*</span></code> suffix usage.</p> +<p>When you run test.units target, you will see:</p> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Testing</span> <span class="n">c</span><span class="o">-</span><span class="n">sample</span> <span class="k">as</span> <span class="n">C</span> <span class="n">passed</span> +<span class="n">Testing</span> <span class="n">css</span><span class="o">-</span><span class="n">singlequote</span><span class="o">-</span><span class="ow">in</span><span class="o">-</span><span class="n">comment</span> <span class="k">as</span> <span class="n">CSS</span> <span class="n">failed</span> <span class="p">(</span><span class="n">KNOWN</span> <span class="n">bug</span><span class="p">)</span> +<span class="n">Testing</span> <span class="n">ctags</span><span class="o">-</span><span class="n">simple</span> <span class="k">as</span> <span class="n">ctags</span> <span class="n">passed</span> +</pre></div> +</div> +<p>Suffix <em>.i</em> is a variant of <em>.b</em>. <em>.i</em> is for merging/gathering input +which lets ctags process enter an infinite loop. Different from <em>.b</em>, +test cases marked as <em>.i</em> are never executed. They are just skipped +but reported the skips:</p> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Testing</span> <span class="n">ada</span><span class="o">-</span><span class="n">ads</span> <span class="k">as</span> <span class="n">Ada</span> <span class="n">passed</span> +<span class="n">Testing</span> <span class="n">ada</span><span class="o">-</span><span class="n">function</span> <span class="k">as</span> <span class="n">Ada</span> <span class="n">skipped</span> <span class="p">(</span><span class="n">may</span> <span class="n">cause</span> <span class="n">an</span> <span class="n">infinite</span> <span class="n">loop</span><span class="p">)</span> +<span class="n">Testing</span> <span class="n">ada</span><span class="o">-</span><span class="n">protected</span> <span class="k">as</span> <span class="n">Ada</span> <span class="n">passed</span> +<span class="o">...</span> + +<span class="n">Summary</span> <span class="p">(</span><span class="n">see</span> <span class="n">CMDLINE</span><span class="o">.</span><span class="n">tmp</span> <span class="n">to</span> <span class="n">reproduce</span> <span class="n">without</span> <span class="n">test</span> <span class="n">harness</span><span class="p">)</span> +<span class="o">------------------------------------------------------------</span> + <span class="c1">#passed: 347</span> + <span class="c1">#FIXED: 0</span> + <span class="c1">#FAILED (unexpected-exit-status): 0</span> + <span class="c1">#FAILED (unexpected-output): 0</span> + <span class="c1">#skipped (features): 0</span> + <span class="c1">#skipped (languages): 0</span> + <span class="c1">#skipped (infinite-loop): 1</span> + <span class="n">ada</span><span class="o">-</span><span class="n">protected</span> + <span class="o">...</span> +</pre></div> +</div> +</section> +<section id="running-under-valgrind-and-timeout"> +<h3><a class="toc-backref" href="#id9">Running under valgrind and timeout</a><a class="headerlink" href="#running-under-valgrind-and-timeout" title="Permalink to this headline">¶</a></h3> +<p>If <code class="docutils literal notranslate"><span class="pre">VG=1</span></code> is given, each test cases are run under valgrind. +If valgrind detects an error, it is reported as:</p> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ make units VG=1 +Testing css-singlequote-in-comment as CSS failed (valgrind-error) +... +Summary (see CMDLINE.tmp to reproduce without test harness) +------------------------------------------------------------ +... +#valgrind-error: 1 + css-singlequote-in-comment +... +</pre></div> +</div> +<p>In this case the report of valgrind is recorded to +<code class="docutils literal notranslate"><span class="pre">Units/css-singlequote-in-comment/VALGRIND-CSS.tmp</span></code>.</p> +<p>NOTE: <code class="docutils literal notranslate"><span class="pre">/bin/bash</span></code> is needed to report the result. You can specify a shell +running test with SHELL macro like:</p> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ make units VG=1 SHELL=/bin/bash +</pre></div> +</div> +<p>If <code class="docutils literal notranslate"><span class="pre">TIMEOUT=N</span></code> is given, each test cases are run under timeout +command. If ctags doesn’t stop in <code class="docutils literal notranslate"><span class="pre">N</span></code> second, it is stopped +by timeout command and reported as:</p> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ make units TIMEOUT=1 +Testing css-singlequote-in-comment as CSS failed (TIMED OUT) +... +Summary (see CMDLINE.tmp to reproduce without test harness) +------------------------------------------------------------ +... +#TIMED-OUT: 1 + css-singlequote-in-comment +... +</pre></div> +</div> +<p>If <code class="docutils literal notranslate"><span class="pre">TIMEOUT=N</span></code> is given, <em>.i</em> test cases are run. They will be +reported as <em>TIMED-OUT</em>.</p> +</section> +<section id="categories"> +<h3><a class="toc-backref" href="#id10">Categories</a><a class="headerlink" href="#categories" title="Permalink to this headline">¶</a></h3> +<p>With <em>.r</em> suffix, you can put test cases under a sub directory +of <em>Units</em>. <code class="docutils literal notranslate"><span class="pre">Units/parser-ada.r</span></code> is an example. If <em>misc/units</em> +test harness, the sub directory is called a category. <code class="docutils literal notranslate"><span class="pre">parser-ada.r</span></code> +is the name category in the above example.</p> +<p><em>CATEGORIES</em> macro of make is for running units in specified categories. +Following command line is for running units in +<code class="docutils literal notranslate"><span class="pre">Units/parser-sh.r</span></code> and <code class="docutils literal notranslate"><span class="pre">Units/parser-ada.r</span></code>:</p> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ make units CATEGORIES='parser-sh,parser-ada' +</pre></div> +</div> +</section> +<section id="finding-minimal-bad-input"> +<h3><a class="toc-backref" href="#id11">Finding minimal bad input</a><a class="headerlink" href="#finding-minimal-bad-input" title="Permalink to this headline">¶</a></h3> +<p>When a test case is failed, the input causing <code class="docutils literal notranslate"><span class="pre">FAILED</span></code> result is +passed to <em>misc/units shrink</em>. <em>misc/units shrink</em> tries to make the +shortest input which makes ctags exits with non-zero status. The +result is reported to <code class="docutils literal notranslate"><span class="pre">Units/\*/SHRINK-${language}.tmp</span></code>. Maybe +useful to debug.</p> +</section> +<section id="acknowledgments"> +<h3><a class="toc-backref" href="#id12">Acknowledgments</a><a class="headerlink" href="#acknowledgments" title="Permalink to this headline">¶</a></h3> +<p>The file name rule is suggested by Maxime Coste <<a class="reference external" href="mailto:frrrwww%40gmail.com">frrrwww<span>@</span>gmail<span>.</span>com</a>>.</p> +</section> +</section> +<section id="reviewing-the-result-of-units-test"> +<h2><a class="toc-backref" href="#id13">Reviewing the result of Units test</a><a class="headerlink" href="#reviewing-the-result-of-units-test" title="Permalink to this headline">¶</a></h2> +<p>Try misc/review.</p> +<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>misc/review --help +<span class="go">Usage:</span> +<span class="go"> misc/review help|--help|-h show this message</span> +<span class="go"> misc/review [list] [-b] list failed Units and Tmain</span> +<span class="go"> -b list .b (known bug) marked cases</span> +<span class="go"> misc/review inspect [-b] inspect difference interactively</span> +<span class="go"> -b inspect .b (known bug) marked cases</span> +<span class="gp">$</span> +</pre></div> +</div> +</section> +<section id="semi-fuzz-fuzz-testing"> +<h2><a class="toc-backref" href="#id14">Semi-fuzz(<em>Fuzz</em>) testing</a><a class="headerlink" href="#semi-fuzz-fuzz-testing" title="Permalink to this headline">¶</a></h2> +<p>Unexpected input can lead ctags to enter an infinite loop. The fuzz +target tries to identify these conditions by passing +semi-random (semi-broken) input to ctags.</p> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ make fuzz LANGUAGES=LANG1[,LANG2,...] +</pre></div> +</div> +<p>With this command line, ctags is run for random variations of all test +inputs under <em>Units/*/input.*</em> of languages defined by <code class="docutils literal notranslate"><span class="pre">LANGUAGES</span></code> +macro variable. In this target, the output of ctags is ignored and +only the exit status is analyzed. The ctags binary is also run under +timeout command, such that if an infinite loop is found it will exit +with a non-zero status. The timeout will be reported as following:</p> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="p">[</span><span class="n">timeout</span> <span class="n">C</span><span class="p">]</span> <span class="n">Units</span><span class="o">/</span><span class="n">test</span><span class="o">.</span><span class="n">vhd</span><span class="o">.</span><span class="n">t</span><span class="o">/</span><span class="nb">input</span><span class="o">.</span><span class="n">vhd</span> +</pre></div> +</div> +<p>This means that if C parser doesn’t stop within N seconds when +<em>Units/test.vhd.t/input.vhd</em> is given as an input, timeout will +interrupt ctags. The default duration can be changed using +<code class="docutils literal notranslate"><span class="pre">TIMEOUT=N</span></code> argument in <em>make</em> command. If there is no timeout but +the exit status is non-zero, the target reports it as following:</p> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="p">[</span><span class="n">unexpected</span><span class="o">-</span><span class="n">status</span><span class="p">(</span><span class="n">N</span><span class="p">)</span> <span class="n">C</span><span class="p">]</span> <span class="n">Units</span><span class="o">/</span><span class="n">test</span><span class="o">.</span><span class="n">vhd</span><span class="o">.</span><span class="n">t</span><span class="o">/</span><span class="nb">input</span><span class="o">.</span><span class="n">vhd</span> +</pre></div> +</div> +<p>The list of parsers which can be used as a value for <code class="docutils literal notranslate"><span class="pre">LANGUAGES</span></code> can +be obtained with following command line</p> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ ctags --list-languages +</pre></div> +</div> +<p>Besides <code class="docutils literal notranslate"><span class="pre">LANGUAGES</span></code> and <code class="docutils literal notranslate"><span class="pre">TIMEOUT</span></code>, fuzz target also takes the +following parameters:</p> +<blockquote> +<div><p><code class="docutils literal notranslate"><span class="pre">VG=1</span></code></p> +<blockquote> +<div><p>Run ctags under valgrind. If valgrind finds a memory +error it is reported as:</p> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="p">[</span><span class="n">valgrind</span><span class="o">-</span><span class="n">error</span> <span class="n">Verilog</span><span class="p">]</span> <span class="n">Units</span><span class="o">/</span><span class="n">array_spec</span><span class="o">.</span><span class="n">f90</span><span class="o">.</span><span class="n">t</span><span class="o">/</span><span class="nb">input</span><span class="o">.</span><span class="n">f90</span> +</pre></div> +</div> +<p>The valgrind report is recorded at +<code class="docutils literal notranslate"><span class="pre">Units/\*/VALGRIND-${language}.tmp</span></code>.</p> +</div></blockquote> +</div></blockquote> +<p>As the same as units target, this semi-fuzz test target also calls +<em>misc/units shrink</em> when a test case is failed. See “<em>Units</em> test facility” +about the shrunk result.</p> +</section> +<section id="noise-testing"> +<h2><a class="toc-backref" href="#id15"><em>Noise</em> testing</a><a class="headerlink" href="#noise-testing" title="Permalink to this headline">¶</a></h2> +<p>After enjoying developing Semi-fuzz testing, I’m looking for a more unfair +approach. Run</p> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ make noise LANGUAGES=LANG1[,LANG2,...] +</pre></div> +</div> +<p>The noise target generates test cases by inserting or deleting one +character to the test cases of <em>Units</em>.</p> +<p>It takes a long time, even without <code class="docutils literal notranslate"><span class="pre">VG=1</span></code>, so this cannot be run +under Travis CI. However, it is a good idea to run it locally.</p> +</section> +<section id="chop-and-slap-testing"> +<h2><a class="toc-backref" href="#id16"><em>Chop</em> and <em>slap</em> testing</a><a class="headerlink" href="#chop-and-slap-testing" title="Permalink to this headline">¶</a></h2> +<p>After reviving many bug reports, we recognized some of them spot +unexpected EOF. The chop target was developed based on this recognition.</p> +<p>The chop target generates many input files from an existing input file +under <em>Units</em> by truncating the existing input file at variety file +positions.</p> +<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>$ make chop LANGUAGES=LANG1[,LANG2,...] +</pre></div> +</div> +<p>It takes a long time, especially with <code class="docutils literal notranslate"><span class="pre">VG=1</span></code>, so this cannot be run +under Travis CI. However, it is a good idea to run it locally.</p> +<p>slap target is derived from chop target. While chop target truncates +the existing input files from tail, the slap target does the same +from head.</p> +</section> +<section id="input-validation-for-units"> +<span id="input-validation"></span><h2><a class="toc-backref" href="#id17">Input validation for <em>Units</em></a><a class="headerlink" href="#input-validation-for-units" title="Permalink to this headline">¶</a></h2> +<p>We have to maintain parsers for languages that we don’t know well. We +don’t have enough time to learn the languages.</p> +<p><em>Units</em> test cases help us not introduce wrong changes to a parser.</p> +<p>However, there is still an issue; a developer who doesn’t know a +target language well may write a broken test input file for the +language. Here comes “Input validation.”</p> +<section id="how-to-run-an-example-session-of-input-validation"> +<h3><a class="toc-backref" href="#id18">How to run an example session of input validation</a><a class="headerlink" href="#how-to-run-an-example-session-of-input-validation" title="Permalink to this headline">¶</a></h3> +<p>You can validate the test input files of <em>Units</em> with <em>validate-input</em> +make target if a validator or a language is defined.</p> +<p>Here is an example validating an input file for JSON.</p> +<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>make validate-input <span class="nv">VALIDATORS</span><span class="o">=</span>jq +<span class="go">...</span> +<span class="go">Category: ROOT</span> +<span class="go">------------------------------------------------------------</span> +<span class="go">simple-json.d/input.json with jq valid</span> + +<span class="go">Summary</span> +<span class="go">------------------------------------------------------------</span> +<span class="gp"> #</span>valid: <span class="m">1</span> +<span class="gp"> #</span>invalid: <span class="m">0</span> +<span class="gp"> #</span>skipped <span class="o">(</span>known invalidation<span class="o">)</span> <span class="m">0</span> +<span class="gp"> #</span>skipped <span class="o">(</span>validator unavailable<span class="o">)</span> <span class="m">0</span> +</pre></div> +</div> +<p>This example shows validating <em>simple-json.d/input.json</em> as an input +file with <em>jq</em> validator. With VALIDATORS variable passed via +command-line, you can specify validators to run. Multiple validators +can be specified using a comma-separated list. If you don’t give +VALIDATORS, the make target tries to use all available validators.</p> +<p>The meanings of “valid” and “invalid” in “Summary” are apparent. In +two cases, the target skips validating input files:</p> +<p>#skipped (known invalidation)</p> +<blockquote> +<div><p>A test case specifies KNOWN-INVALIDATION in its <em>validator</em> file.</p> +</div></blockquote> +<p>#skipped (validator unavailable)</p> +<blockquote> +<div><p>A command for a validator is not available.</p> +</div></blockquote> +</section> +<section id="validator-file"> +<h3><a class="toc-backref" href="#id19"><em>validator</em> file</a><a class="headerlink" href="#validator-file" title="Permalink to this headline">¶</a></h3> +<p><em>validator</em> file in a <em>Units</em> test directory specifies which +validator the make target should use.</p> +<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>cat Units/simple-json.d/validator +<span class="go">jq</span> +</pre></div> +</div> +<p>If you put <em>validator</em> file to a category directory (a directory +having <em>.r</em> suffix), the make target uses the validator specified in +the file as default. The default validator can be overridden with a +<em>validator</em> file in a subdirectory.</p> +<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>cat Units/parser-puppetManifest.r/validator +<span class="go">puppet</span> +<span class="gp"># </span>cat Units/parser-puppetManifest.r/puppet-append.d/validator +<span class="go">KNOWN-INVALIDATION</span> +</pre></div> +</div> +<p>In the example, the make target uses <em>puppet</em> validator for validating +the most of all input files under <em>Units/parser-puppetManifest.r</em> +directory. An exception is an input file under +<em>Units/parser-puppetManifest.r/puppet-append.d</em> directory. The +directory has its specific <em>validator</em> file.</p> +<p>If a <em>Unit</em> test case doesn’t have <em>expected.tags</em> file, the make +target doesn’t run the validator on the file even if a default +validator is given in its category directory.</p> +<p>If a <em>Unit</em> test case specifies KNOWN-INVALIDATION in its <em>validator</em> +file, the make target just increments “#skipped (known invalidation)” +counter. The target reports the counter at the end of execution.</p> +</section> +<section id="validator-command"> +<h3><a class="toc-backref" href="#id20">validator command</a><a class="headerlink" href="#validator-command" title="Permalink to this headline">¶</a></h3> +<p>A validator specified in a <em>validator</em> file is a command file put +under <em>misc/validators</em> directory. The command must have “validator-” +as prefix in its file name. For an example, +<em>misc/validators/validator-jq</em> is the command for “jq”.</p> +<p>The command file must be an executable. <em>validate-input</em> make target +runs the command in two ways.</p> +<p><em>is_runnable</em> method</p> +<blockquote> +<div><p>Before running the command as a validator, the target runs +the command with “is_runnable” as the first argument. +A validator command can let the target know whether the +validator command is runnable or not with exit status. +0 means ready to run. Non-zero means not ready to run.</p> +<p>The make target never runs the validator command for +validation purpose if the exit status is non-zero.</p> +<p>For an example, <em>misc/validators/validator-jq</em> command uses <em>jq</em> +command as its backend. If <em>jq</em> command is not available on a +system, <em>validator-jq</em> can do nothing. If such case, +<em>is_runnable</em> method of <em>validator-jq</em> command should exit with +non-zero value.</p> +</div></blockquote> +<p><em>validate</em> method</p> +<blockquote> +<div><p>The make target runs the command with “validate* and an input +file name for validating the input file. The command exits +non-zero if the input file contains invalid syntax. This method +will never run if <em>is_runnable</em> method of the command exits with +non-zero.</p> +</div></blockquote> +</section> +</section> +<section id="testing-examples-in-language-specific-man-pages"> +<span id="man-test"></span><h2><a class="toc-backref" href="#id21">Testing examples in language specific man pages</a><a class="headerlink" href="#testing-examples-in-language-specific-man-pages" title="Permalink to this headline">¶</a></h2> +<dl class="field-list simple"> +<dt class="field-odd">Maintainer</dt> +<dd class="field-odd"><p>Masatake YAMATO <<a class="reference external" href="mailto:yamato%40redhat.com">yamato<span>@</span>redhat<span>.</span>com</a>></p> +</dd> +</dl> +<hr class="docutils" /> +<p><cite>man-test</cite> is a target for testing the examples in the language +specific man pages (<code class="docutils literal notranslate"><span class="pre">man/ctags-lang-<LANG>.7.rst.in</span></code>). The command +line for running the target is:</p> +<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>make man-test +</pre></div> +</div> +<p>An example for testing must have following form:</p> +<div class="highlight-ReStructuredText notranslate"><div class="highlight"><pre><span></span>"input.<EXT>" + +<span class="p">..</span> <span class="ow">code-block</span><span class="p">::</span> <span class="k"><LANG></span> + +<span class="s"> <INPUT LINES></span> + +"output.tags" +with "<OPTIONS FOR CTAGS>" + +<span class="p">..</span> <span class="ow">code-block</span><span class="p">::</span> tags + + <TAGS OUTPUT LINES> +</pre></div> +</div> +<p>The man-test target recognizes the form and does the same as +the following shell code for each example in the man page:</p> +<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span><span class="nb">echo</span> <INPUT LINES> > input.<EXT> +<span class="gp">$ </span><span class="nb">echo</span> <TAGS OUTPUT LINES> > output.tags +<span class="gp">$ </span>ctags <OPTIONS FOR CTAGS> > actual.tags +<span class="gp">$ </span>diff output.tags actual.tags +</pre></div> +</div> +<p>A backslash character at the end of <code class="docutils literal notranslate"><span class="pre"><INPUT</span> <span class="pre">LINES></span></code> or +<code class="docutils literal notranslate"><span class="pre"><TAGS</span> <span class="pre">OUTPUT</span> <span class="pre">LINES></span></code> represents the continuation of lines; +a subsequent newline is ignored.</p> +<div class="highlight-ReStructuredText notranslate"><div class="highlight"><pre><span></span><span class="p">..</span> <span class="ow">code-block</span><span class="p">::</span> <span class="k">tags</span> + +<span class="s"> very long\</span> +<span class="s"> line</span> +</pre></div> +</div> +<p>is read as:</p> +<div class="highlight-ReStructuredText notranslate"><div class="highlight"><pre><span></span><span class="p">..</span> <span class="ow">code-block</span><span class="p">::</span> tags + + very long line +</pre></div> +</div> +<p>Here is an example of a test case taken from +<code class="docutils literal notranslate"><span class="pre">ctags-lang-python.7.rst.in</span></code>:</p> +<div class="highlight-ReStructuredText notranslate"><div class="highlight"><pre><span></span>"input.py" + +<span class="p">..</span> <span class="ow">code-block</span><span class="p">::</span> <span class="k">Python</span> + + <span class="kn">import</span> <span class="nn">X0</span> + +"output.tags" +with "--options=NONE -o - --extras=+r --fields=+rzK input.py" + +<span class="p">..</span> <span class="ow">code-block</span><span class="p">::</span> tags + + X0 input.py /^import X0$/;" kind:module roles:imported +</pre></div> +</div> +<p><code class="docutils literal notranslate"><span class="pre">make</span> <span class="pre">man-test</span></code> returns 0 if the all test cases in the all language +specific man pages are passed.</p> +<p>Here is an example output of the man-test target.</p> +<div class="highlight-console notranslate"><div class="highlight"><pre><span></span><span class="gp">$ </span>make man-test +<span class="go"> RUN man-test</span> +<span class="gp"># </span>Run <span class="nb">test</span> cases <span class="k">in</span> ./man/ctags-lang-julia.7.rst.in +<span class="go">```</span> +<span class="go">./man/ctags-lang-julia.7.rst.in[0]:75...passed</span> +<span class="go">./man/ctags-lang-julia.7.rst.in[1]:93...passed</span> +<span class="go">```</span> +<span class="gp"># </span>Run <span class="nb">test</span> cases <span class="k">in</span> ./man/ctags-lang-python.7.rst.in +<span class="go">```</span> +<span class="go">./man/ctags-lang-python.7.rst.in[0]:116...passed</span> +<span class="go">./man/ctags-lang-python.7.rst.in[1]:133...passed</span> +<span class="go">./man/ctags-lang-python.7.rst.in[2]:154...passed</span> +<span class="go">./man/ctags-lang-python.7.rst.in[3]:170...passed</span> +<span class="go">./man/ctags-lang-python.7.rst.in[4]:187...passed</span> +<span class="go">./man/ctags-lang-python.7.rst.in[5]:230...passed</span> +<span class="go">```</span> +<span class="gp"># </span>Run <span class="nb">test</span> cases <span class="k">in</span> ./man/ctags-lang-verilog.7.rst.in +<span class="go">```</span> +<span class="go">./man/ctags-lang-verilog.7.rst.in[0]:51...passed</span> +<span class="go">```</span> +<span class="go">OK</span> +</pre></div> +</div> +<p>NOTE: keep examples in the man pages simple. If you want to test ctags +complicated (and or subtle) input, use the units target. The main +purpose of the examples is for explaining the parser.</p> +</section> +</section> + + + <div class="clearer"></div> + </div> + </div> + </div> + <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> + <div class="sphinxsidebarwrapper"> + <h3><a href="index.html">Table of Contents</a></h3> + <ul> +<li><a class="reference internal" href="#">Testing a parser</a><ul> +<li><a class="reference internal" href="#units-test-facility"><em>Units</em> test facility</a><ul> +<li><a class="reference internal" href="#how-to-write-a-test-case">How to write a test case</a></li> +<li><a class="reference internal" href="#note-for-importing-a-test-case-from-test-directory">Note for importing a test case from Test directory</a></li> +<li><a class="reference internal" href="#example-of-files">Example of files</a></li> +<li><a class="reference internal" href="#how-to-run-unit-tests">How to run unit tests</a></li> +<li><a class="reference internal" href="#example-of-running">Example of running</a></li> +<li><a class="reference internal" href="#running-unit-tests-for-specific-languages">Running unit tests for specific languages</a></li> +<li><a class="reference internal" href="#gathering-test-cases-for-known-bugs">Gathering test cases for known bugs</a></li> +<li><a class="reference internal" href="#running-under-valgrind-and-timeout">Running under valgrind and timeout</a></li> +<li><a class="reference internal" href="#categories">Categories</a></li> +<li><a class="reference internal" href="#finding-minimal-bad-input">Finding minimal bad input</a></li> +<li><a class="reference internal" href="#acknowledgments">Acknowledgments</a></li> +</ul> +</li> +<li><a class="reference internal" href="#reviewing-the-result-of-units-test">Reviewing the result of Units test</a></li> +<li><a class="reference internal" href="#semi-fuzz-fuzz-testing">Semi-fuzz(<em>Fuzz</em>) testing</a></li> +<li><a class="reference internal" href="#noise-testing"><em>Noise</em> testing</a></li> +<li><a class="reference internal" href="#chop-and-slap-testing"><em>Chop</em> and <em>slap</em> testing</a></li> +<li><a class="reference internal" href="#input-validation-for-units">Input validation for <em>Units</em></a><ul> +<li><a class="reference internal" href="#how-to-run-an-example-session-of-input-validation">How to run an example session of input validation</a></li> +<li><a class="reference internal" href="#validator-file"><em>validator</em> file</a></li> +<li><a class="reference internal" href="#validator-command">validator command</a></li> +</ul> +</li> +<li><a class="reference internal" href="#testing-examples-in-language-specific-man-pages">Testing examples in language specific man pages</a></li> +</ul> +</li> +</ul> + + <h4>Previous topic</h4> + <p class="topless"><a href="tips.html" + title="previous chapter">Testing ctags</a></p> + <h4>Next topic</h4> + <p class="topless"><a href="reporting.html" + title="next chapter">Request for extending a parser (or Reporting a bug of parser)</a></p> +<div id="searchbox" style="display: none" role="search"> + <h3 id="searchlabel">Quick search</h3> + <div class="searchformwrapper"> + <form class="search" action="search.html" method="get"> + <input type="text" name="q" aria-labelledby="searchlabel" /> + <input type="submit" value="Go" /> + </form> + </div> +</div> +<script>$('#searchbox').show(0);</script> + </div> + </div> + <div class="clearer"></div> + </div> + <div class="related" role="navigation" aria-label="related navigation"> + <h3>Navigation</h3> + <ul> + <li class="right" style="margin-right: 10px"> + <a href="genindex.html" title="General Index" + >index</a></li> + <li class="right" > + <a href="reporting.html" title="Request for extending a parser (or Reporting a bug of parser)" + >next</a> |</li> + <li class="right" > + <a href="tips.html" title="Testing ctags" + >previous</a> |</li> + <li class="nav-item nav-item-0"><a href="index.html">Universal Ctags 0.3.0 documentation</a> »</li> + <li class="nav-item nav-item-this"><a href="">Testing a parser</a></li> + </ul> + </div> + <div class="footer" role="contentinfo"> + © Copyright 2015, Universal Ctags Team. + Last updated on 11 Jun 2021. + Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> 4.0.2. + </div> + </body> +</html>
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