The GMPE has a test. However the test table erroneously contains the 'vs30' column even if this is not a required parameter. Therefore when calling the 'check_gsim' method a site context with vs30 is created and that's why no errors are thrown when the test is running.

I'm going the extend the BaseGSIMTestCase so that it checks that the required parameters as defined in the gsim object are defined also in the table.