Add unit test for fit_transform
Add test for OOTDetector.__init__
Refine TestDesignMatrix
Refine TestClustDist
Refine TestMeanComp
Refine TestTxtCompDist
Refine TestTxtCompDist again
Separate test for TopListEvaluator.__init__
Simplify test for _get_nums()
Add test for min_sup
Add test for max_sup
Refactor and strengthen TestPerformance