Currently there are two automated methods to test GNU Modula-2. The first method is make gm2.paranoid in which gm2 builds itself and finally the test runs both parent and child generations of the compiler and compares the output. Be warned that this test can take some time to execute. This test is invoked by:
$ cd host-build/gcc ; make gm2.paranoid
The second method used to test GNU Modula-2 is to run the regression test suite, via:
$ cd host-build/gcc $ make check-m2
Depending on the speed of your computer these tests may take a while to complete.