Add tests for lineplot categorical palette
Add tests for lineplot categorical palette

mwaskom/seaborn,phobson/seaborn,phobson/seaborn,petebachant/seaborn,lukauskas/seaborn,arokem/seaborn,mwaskom/seaborn,anntzer/seaborn,lukauskas/seaborn,arokem/seaborn,sauliusl/seaborn,anntzer/seaborn