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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>33.5. Test Coverage Examination</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="regress-tap.html" title="33.4. TAP Tests" /><link rel="next" href="client-interfaces.html" title="Part IV. Client Interfaces" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">33.5. Test Coverage Examination</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="regress-tap.html" title="33.4. TAP Tests">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="regress.html" title="Chapter 33. Regression Tests">Up</a></td><th width="60%" align="center">Chapter 33. Regression Tests</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="client-interfaces.html" title="Part IV. Client Interfaces">Next</a></td></tr></table><hr /></div><div class="sect1" id="REGRESS-COVERAGE"><div class="titlepage"><div><div><h2 class="title" style="clear: both">33.5. Test Coverage Examination</h2></div></div></div><p>
The PostgreSQL source code can be compiled with coverage testing
instrumentation, so that it becomes possible to examine which
parts of the code are covered by the regression tests or any other
test suite that is run with the code. This is currently supported
when compiling with GCC, and it requires the <code class="command">gcov</code>
and <code class="command">lcov</code> programs.
</p><p>
A typical workflow looks like this:
</p><pre class="screen">
./configure --enable-coverage ... OTHER OPTIONS ...
make
make check # or other test suite
make coverage-html
</pre><p>
Then point your HTML browser
to <code class="filename">coverage/index.html</code>.
</p><p>
If you don't have <code class="command">lcov</code> or prefer text output over an
HTML report, you can run
</p><pre class="screen">
make coverage
</pre><p>
instead of <code class="literal">make coverage-html</code>, which will
produce <code class="filename">.gcov</code> output files for each source file
relevant to the test. (<code class="literal">make coverage</code> and <code class="literal">make
coverage-html</code> will overwrite each other's files, so mixing them
might be confusing.)
</p><p>
You can run several different tests before making the coverage report;
the execution counts will accumulate. If you want
to reset the execution counts between test runs, run:
</p><pre class="screen">
make coverage-clean
</pre><p>
</p><p>
You can run the <code class="literal">make coverage-html</code> or <code class="literal">make
coverage</code> command in a subdirectory if you want a coverage
report for only a portion of the code tree.
</p><p>
Use <code class="literal">make distclean</code> to clean up when done.
</p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="regress-tap.html" title="33.4. TAP Tests">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="regress.html" title="Chapter 33. Regression Tests">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="client-interfaces.html" title="Part IV. Client Interfaces">Next</a></td></tr><tr><td width="40%" align="left" valign="top">33.4. TAP Tests </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.4 Documentation">Home</a></td><td width="40%" align="right" valign="top"> Part IV. Client Interfaces</td></tr></table></div></body></html>
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