public void GetArmingVolume_Returns_Integer() { // Arrange var miioDevice = new Mock <IMiioTransport>(); miioDevice.Setup(x => x.SendMessage(It.IsAny <string>())).Returns("{\"result\":[10],\"id\":1}"); var miioGateway = new MiioGateway(miioDevice.Object); // Act var armingVolume = miioGateway.GetArmingVolume(); // Assert miioDevice.Verify(x => x.SendMessage("{\"id\": 1, \"method\": \"get_alarming_volume\", \"params\": []}"), Times.Once()); Assert.Equal(10, armingVolume); }