public async Task GetArmingVolumeAsync_Returns_IntegerAsync() { // Arrange var miioDevice = new Mock <IMiioTransport>(); miioDevice.Setup(x => x.SendMessageAsync(It.IsAny <string>())).Returns(Task.FromResult("{\"result\":[20],\"id\":1}")); var miioGateway = new MiioGateway(miioDevice.Object); // Act var armingVolume = await miioGateway.GetArmingVolumeAsync(); // Assert miioDevice.Verify(x => x.SendMessageAsync("{\"id\": 1, \"method\": \"get_alarming_volume\", \"params\": []}"), Times.Once()); Assert.Equal(20, armingVolume); }