public void TestPostGroupMessage() { _groupToolService.Setup(mocked => mocked.SendAllGroupParticipantsEmail(_auth, 123, 1, "subject", "message")); var result = _fixture.PostGroupMessage(123, 1, new GroupMessageDTO { Subject = "subject", Body = "message" }); _groupToolService.VerifyAll(); Assert.IsNotNull(result); Assert.IsInstanceOf <OkResult>(result); }