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<div class="navheader"><table width="100%" summary="Navigation header"><tr><td width="20%" align="left"><a accesskey="p" href="eunit.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="property_based_testing.html">Next</a></td></tr></table><hr /></div><div class="chapter"><div class="titlepage"><div><div><h2 class="title"><a id="ct"></a>Chapter 16. Common Test</h2></div></div></div><p>Common Test is Erlang’s functional testing framework.
Erlang.mk automates the discovery and running of Common
Test suites.</p><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_writing_tests_2"></a>16.1. Writing tests</h2></div></div></div><p>The <a class="ulink" href="http://www.erlang.org/doc/apps/common_test/write_test_chapter.html" target="_top">Common Test user guide</a>
is the best place to learn how to write tests. Erlang.mk
requires that file names for test suites end with <span class="emphasis"><em>_SUITE.erl</em></span>
and that the files be located in the <span class="emphasis"><em>$(TEST_DIR)</em></span> directory.
This defaults to <span class="emphasis"><em>test/</em></span>.</p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_configuration_5"></a>16.2. Configuration</h2></div></div></div><p>The <code class="literal">CT_OPTS</code> variable allows you to set extra Common Test
options. Options are documented in the
<a class="ulink" href="http://www.erlang.org/doc/apps/common_test/run_test_chapter.html" target="_top">Common Test user guide</a>.
You can use it to set Common Test hooks, for example:</p><pre class="programlisting">CT_OPTS = -ct_hooks cowboy_ct_hook</pre><p>The <code class="literal">CT_SUITES</code> variable can be used to override what
Common Test suites Erlang.mk will be aware of. It does
not normally need to be set as Erlang.mk will find the
test suites automatically.</p><p>The name of the suite is the part before <code class="literal">_SUITE.erl</code>.
If the file is named <span class="emphasis"><em>http_SUITE.erl</em></span>, the test suite
is <code class="literal">http</code>:</p><pre class="programlisting">CT_SUITES = http ws</pre></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="_usage_4"></a>16.3. Usage</h2></div></div></div><p>To run all tests (including Common Test):</p><pre class="programlisting">$ make tests</pre><p>To run all tests and static checks (including Common Test):</p><pre class="programlisting">$ make check</pre><p>You can also run Common Test separately:</p><pre class="programlisting">$ make ct</pre><p>Erlang.mk will create targets for all test suites it finds.
If you have a file named <span class="emphasis"><em>test/http_SUITE.erl</em></span>, then the
target <code class="literal">ct-http</code> will run that specific test suite:</p><pre class="programlisting">$ make ct-http</pre><p>Erlang.mk provides a convenient way to run a specific
group or a specific test case within a specific group,
using the variable <code class="literal">t</code>. Note that this only applies to
suite-specific targets, like the <code class="literal">ct-http</code> example above.</p><p>To run all tests from the <code class="literal">http_compress</code> group in the
<code class="literal">http_SUITE</code> test suite, write:</p><pre class="programlisting">$ make ct-http t=http_compress</pre><p>Similarly, to run a specific test case in that group:</p><pre class="programlisting">$ make ct-http t=http_compress:headers_dupe</pre><p>To do the same against a multi-application repository,
you can use the <code class="literal">-C</code> option:</p><pre class="programlisting">$ make -C apps/my_app ct-http t=my_group:my_case</pre><p>Note that this also applies to dependencies. When using Cowboy
as a dependency, you can run the following directly:</p><pre class="programlisting">$ make -C deps/cowboy ct-http t=http_compress</pre><p>Finally, <a class="link" href="coverage.html" title="Chapter 18. Code coverage">code coverage</a>
<a class="xref" href="coverage.html" title="Chapter 18. Code coverage">Chapter 18, <em>Code coverage</em></a> is available,
but covered in its own chapter.</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="eunit.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="tests.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="property_based_testing.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> </td></tr></table></div>
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