Test configuration for a mixed C++/Python solution using CMake as the build system

[Mikko Vainio (mvainioe)]

Is there a configuration file that would be parsed by the test discovery code when the solution uses CMake as the build system?
In this setting, the production code is C++ but tests are written in Python using pytest.

A file named PythonSettings.json seems to get parsed, the test framework can be switched between "pytest" and "unittest". Is this file documented somewhere?