GoogleTest says this:

TEST() arguments go from general to specific. The first argument is the name of the test suite, and the second argument is the test's name within the test suite. Both names must be valid C++ identifiers, and they should not contain any underscores (_)

https://github.com/google/googletest/blob/master/googletest/docs/primer.md#simple-tests

We have lots of underscores in the names of our TESTs. We should remove them.