def METHOD_NAME():
    """
    Binder environment yaml should be the sum of main.yml and tests.yml
    requirements.
    """
    spyder_env = parse_environment_yaml(ENV_FPATH)
    main_reqs = parse_environment_yaml(REQ_FPATH)
    test_reqs = parse_environment_yaml(REQ_TEST_FPATH)
    linux_reqs = parse_environment_yaml(REQ_LINUX_FPATH)
    # Check that the requirement files match the environment yaml file
    full_reqs = {}
    full_reqs.update(main_reqs)
    full_reqs.update(linux_reqs)
    full_reqs.update(test_reqs)
    assert spyder_env == full_reqs