gistfile1.py

def get_required_databases(suite):    
    """ given a test suite, return all the databases that
        these testcase-classes publish as requirements
    """                               
    required_databases = []
    for testclass in set([x.__class__ for x in suite._tests]):
        required_databases.extend(db_requirements(testclass)
       
    return list(set(required_databases))