def test_maybe_interface(self):
maybe = Maybe()
FunctorLaws.validate(Maybe)
ApplicativeLaws.validate(Maybe)
MonadLaws.validate(Maybe)
self.assertEquals(Maybe.unit(1), Something(1))
self.assertRaises(NotImplementedError, lambda: maybe.get())
self.assertRaises(NotImplementedError, lambda: maybe.get_or_else(None))
def test_either_interface(self):
either = Either()
FunctorLaws.validate(Either)
ApplicativeLaws.validate(Either)
MonadLaws.validate(Either)
self.assertEqual(Either.unit(2), Success(2))
self.assertRaises(NotImplementedError, lambda: either.is_error())
self.assertRaises(NotImplementedError, lambda: either.left())
self.assertRaises(NotImplementedError, lambda: either.right())
def test_list_interface(self):
FunctorLaws.validate(List)
ApplicativeLaws.validate(List)
MonadLaws.validate(List)