To use enum class when asserting in unit tests using ASSERT_EQ (or anything built on ASSERT_COMPARE) you also need to define an operator<< for your enum class type.

It would be nice if the assertion macros had a fallback for enum class that explicitly casts to the underlying type so the user does not have to add operator<< (or explicitly casting in unit tests)

Another workaround exists which is to use ASSERT_THAT(..., Eq(...)); which is also clunky.