Document commands that are valid in TEST_INCLUDE_FILES
Apparently not all CMake commands are valid in the context of a TEST_INCLUDE_FILES
script, for example get_test_property
. Sometimes you will get an error like "Unknown CMake command", sometimes a command will fail in other ways, for example, set_property(TEST test APPEND PROPERTY LABELS labels)
fails with "set_property given TEST names that do not exist".
The documentation should indicate which commands are valid or invalid in a TEST_INCLUDE_FILES
script.