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9.1 Introduction to regression tests
LilyPond has a complete suite of regression tests that are used to ensure that changes to the code do not break existing behavior. These regression tests comprise small LilyPond snippets that test the functionality of each part of LilyPond.
Regression tests are added when new functionality is added to LilyPond or when bugs are fixed.
The regression tests are compiled using special
targets. There are three primary uses for the regression
tests. First, successful completion of the regression tests means
that LilyPond has been properly built. Second, the output of the
regression tests can be manually checked to ensure that
the graphical output matches the description of the intended
output. Third, the regression test output from two different
versions of LilyPond can be automatically compared to identify
any differences. These differences should then be manually
checked to ensure that the differences are intended.
Regression tests (“regtests”) are available in precompiled form as part of the documentation. Regtests can also be compiled on any machine that has a properly configured LilyPond build system.