This weekend GTest landed in the mozilla-central tree. See Bug 767231 for the changes and follow up bugs. We have some follow-up changes coming such as adding a mach target, replacing –enable-gtest by –enable-tests and adding gtests to tinderbox. Everything is now ready for developers to start adding their own unit tests to libxul.
All the unit tests will be linked within libxul. This means that you don’t have to export any symbols you intend on testing. See Bug 767231 for the pros and cons of this solution. The summary is that unit tests will run against a different libxul library (libxul+unittest) than the one we will ship (libxul only) at the benefit of having access to all the symbols. Unit tests will not be shipped in a normal release build.
To run GTest build with ‘–enable-gtest’ and simply add the -unittest option when running firefox. To add an unit test create a test .cpp file, declare it to the makefile ‘GTEST_CPPSRCS = TestFoo.cpp’ and you’re done.
For more details see the up-to-date documentation: https://developer.mozilla.org/en-US/docs/GTest