Test::TAP::Model::Visual - A result set that will create ::Visual children,
and knows it's color.
It inherits from Test::TAP::Model::Colorful. That's about it.
This is actually the only functionality. This method is overridden to return Test::TAP::Model::File::Visual. See "file_class" in Test::TAP::Model for details.
A nice little textual summary about the result of the entire test run.
A short descriptive string used to distinguish this model from others in the various consolidated reports.
An overridden version of get_test_files which sets
desc_string on the files based on the one from $self.