Use asserts with more specific assert methods, e.g.: from
assertTrue(sth == None) to assertIsNone(*),
assertTrue(isinstance(inst, type)) to assertIsInstace(inst, type) or
assertTrue(not sth) to assertFalse(sth).
This change ensures a better description will be shown on fail. This is
the recommended way to use assertions provided by testtools.
Change-Id: Ia4a34e0145176e077bbf7e9ed6f69d815c6ed840
Co-authored-by: Stephen Finucane <sfinucan@redhat.com>
75f7a2f29e