def METHOD_NAME(cls):
    #locate the bin and test_data directories
    cls.python        = sys.executable
    cls.executable    = os.path.join(pvactools_directory(), "pvactools", "lib", "aggregate_all_epitopes.py")
    cls.test_data_dir = os.path.join(pvactools_directory(), "tests", "test_data", "aggregate_all_epitopes")