
I changed asserts with more specific assert methods. e.g.: from assertTrue(sth == None) to assertIsNone(*) or assertTrue(isinstance(inst, type)) to assertIsInstace(inst, type) or assertTrue(not sth) to assertFalse(sth). The code gets more readable, and a better description will be shown on fail. Change-Id: I9531c9939aa7c2dac127b5dc865b8d396dab318f