How to use the environs.EnvValidationError function in environs

def test_validation(self, env, set_env):
        set_env({"INT": "invalid", "DTIME": "notadatetime"})
        env.int("INT")
        env.datetime("DTIME")
        env.str("REQUIRED")
        with pytest.raises(environs.EnvValidationError) as excinfo:
            env.seal()
        exc = excinfo.value
        msg = exc.args[0]
        assert "REQUIRED" in msg
        assert "INT" in msg
        assert "DTIME" in msg
        assert "REQUIRED" in exc.error_messages
        assert "INT" in exc.error_messages
        assert "DTIME" in exc.error_messages