def METHOD_NAME(categorical_space):
    """Test if string number value passed to categorical space is validated properly"""
    namespace = "x"
    # Make sure integer 12 does not pass
    is_valid, casted_value = _validate_input_value("12", categorical_space, namespace)
    assert not is_valid
    # Now test "12" as a string
    is_valid, casted_value = _validate_input_value("'12'", categorical_space, namespace)
    assert is_valid
    assert isinstance(casted_value, str)