I have a large solution in Visual Studio (100+) projects, of which most are dll's. The test code is in the DLL's and the tests are run using the provided console_test_runner. At the moment, each DLL has a single passing test. However, when I run the console_test_runner on a single dll, the output indicates that there are more tests. For example: D:\Projects\MyProject\console_test_runner.exe --test MyDll1.dll Running 5 test cases... *** No errors detected So I put a print statement in the test in each DLL and ran it again, and here's what happened: D:\Projects\MyProject\console_test_runner.exe --test MyDll1.dll Running 5 test cases... TestMyDll5 TestMyDll4 TestMyDll3 TestMyDll2 TestMyDll1 *** No errors detected The project for MyDll1 depends on the other projects. That can't be a coincidence! I'm confused though, why is the console_test_runner executing tests in other DLL's when I've only specified MyDll1 on the command line? Each DLL has its own unit_test_init() function declared in the pre-compiled header, so I'm really lost on what is happening here. Is it possible that the other dll tests are getting registered as well?