GTest is a C++ testing framework which can be used to test C/C++ code in Blender. It needs to be enabled at build-time, and creates tests (in the form of executables) which are run to perform the tests.
Tests are located in blenders source directory 'tests/gtests'
WITH_GTESTS CMake build option and execute the tests from the build directory 'bin/tests/'
The tests for Blender's path utilities: 'source/blender/blenlib/intern/path_util.c'
Test file located in: 'tests/gtests/blenlib/BLI_path_util_test.cc'
The test can be executed from the build directory: './bin/tests/BLI_path_util_test'
And produces output, for example:
[==========] Running 3 tests from 1 test case. [----------] Global test environment set-up. [----------] 3 tests from path_util [ RUN ] path_util.PathUtilClean [ OK ] path_util.PathUtilClean (0 ms) [ RUN ] path_util.PathUtilFrame [ OK ] path_util.PathUtilFrame (0 ms) [ RUN ] path_util.PathUtilSplitDirfile [ OK ] path_util.PathUtilSplitDirfile (0 ms) [----------] 3 tests from path_util (0 ms total) [----------] Global test environment tear-down [==========] 3 tests from 1 test case ran. (0 ms total) [ PASSED ] 3 tests.
For information on the GTest framework its self, see: https://code.google.com/p/googletest/w/list
See Blenders Automated Testing Project: http://developer.blender.org/tag/automated_testing