[IMPROV] Use proper asserts

- assert(Not)Equal instead of assert(Not)Equals
- assertIn(X, Y) instead of assertTrue(X in Y)
- assertNotIn(X, Y) instead of assertTrue(X not in Y)
                and instead of assertFalse(X in Y)
- assertEqual(X, Y) instead of assertEqual(X == Y)

Change-Id: I1bbef226a75d6ddc2e536ca94459595b198d81cc
Merge "[IMPROV] Use proper asserts"