uclibc-ng/test/README

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 For: User
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The following make variables may help you in testing:
 - UCLIBC_ONLY  - only run tests against uClibc
 - GLIBC_ONLY   - only run tests against glibc
 - COMPILE_ONLY - just build the tests, don't run them
 - V / VERBOSE  - run tests with a lot of output

So, to just run the uClibc tests, try this:
make check UCLIBC_ONLY=1

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 For: Developer
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The structure of this test system is:
 test/                 toplevel dir containing common test code
 test/Rules.mak        Common build code
 test/Test.mak         Runtime test make code
 test/subdir/          code specific to a subsystem is stored in a subdir
 test/subdir/Makefile  describe the tests to run
 test/subdir/*.c       the tests

Each subdir Makefile must define the TESTS variable and include the
toplevel Test.mak file:
TESTS := foo
include ../Test.mak
Each test must use a similar .c name; so the "foo" test needs a "foo.c".

Additionally, the following options further control specific test behavior:
CFLAGS_foo    := extra cflags to use to compile test
DODIFF_foo    := compare the output of the glibc and uClibc tests (see below)
LDFLAGS_foo   := extra ldflags to use to link test
OPTS_foo      := extra options to pass to test
RET_foo       := expected exit code of test; default is 0
WRAPPER_foo   := execute stuff just before test

Or to control all tests in a subdir:
EXTRA_CLEAN   := extra files to remove in the clean target
EXTRA_CFLAGS  := -DFOO
EXTRA_LDFLAGS := -lpthread
OPTS          := 
WRAPPER       := 

If you want to compare the output of a test with known good output, then just
create a local file named "foo.out.good" and the output generated by the test
"foo" will be automatically stored in "foo.out" and compared to "foo.out.good".