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To run tests from an existing collection, first use configure
as usual to set up the build directory. Then type make check.
If the check target exists, it usually saves you some trouble.
For instance, it can set up any auxiliary programs or other files
needed by the tests. The most common file the check target
depends on is the site.exp file. The site.exp contains
various variables that DejaGnu uses to determine the configuration of
the program being tested.
Once you have run make check to build any auxiliary files, you
can invoke the test driver runtest directly to repeat the
tests. You will also have to execute runtest directly for test
collections with no check target in the Makefile.
GNU Automake has built-in support for DejaGnu. To add DejaGnu support
to your generated Makefile.in, just add the keyword
dejagnu to the AUTOMAKE_OPTIONS variable in Makefile.am.
This will ensure that the generated Makefile.in has a
check target that invokes DejaGnu correctly. See DejaGnu Tests in The GNU Automake Manual.