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<h4 class="subsection">1.2.5 Testing LilyPond</h4>
<p><a name="testing"></a>
<p>LilyPond comes with an extensive suite that exercises the entire
program. This suite can be used to automatically check the impact of a
change. This is done as follows
<pre class="example"> make test-baseline
<em>## apply your changes, compile</em>
make check
</pre>
<p>This will leave an HTML page <samp><span class="file">out/test-results/index.html</span></samp>. This
page shows all the important differences that your change introduced,
whether in the layout, MIDI, performance or error reporting.
<p>To rerun tests, use
<pre class="example"> make test-redo <em>## redo files differing from baseline</em>
make test-clean <em>## remove all test results</em>
</pre>
<p class="noindent">and then run <code>make check</code> again.
<p>For tracking memory usage as part of this test, you will need GUILE
CVS; especially the following patch:
<a href="http://lilypond.org/vc/gub.darcs/patches/guile-1.9-gcstats.patch">http://lilypond.org/vc/gub.darcs/patches/guile-1.9-gcstats.patch</a>.
<p>For checking the coverage of the test suite, do the following
<pre class="example"> ./buildscripts/build-coverage.sh
<em># uncovered files, least covered first</em>
python ./buildscripts/coverage.py --summary out-cov/*.cc
<em># consecutive uncovered lines, longest first</em>
python ./buildscripts/coverage.py --uncovered out-cov/*.cc
</pre>
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