Replace all assertEqual and assertEquals statements with regular assert - partial progress on #115
Replace assertIsInstance call, and change assertFalse(isinstance(...)) calls to a more idiomatic assert not isinstance. Partial progress on #115
Replace assertIn calls for #115
Replace assertNotEqual calls for #115
Replace assertTrue calls for #115
Replace assertNotIn calls for #115
Replace assertIsNotNone calls for #115
Replace assertFalse calls for #115