public async Task GetAllDevicesAsync_WhenCalled_ReturnsSensor() { // Arange var sensorModel = Fixture.Create <Sensor>(); MockSensorRepository.Setup(repository => repository.GetByMAC("1111", new CancellationToken(false))) .ReturnsAsync(() => sensorModel); // Act var sensor = await _sensorService.GetByMACAsync("1111", CancellationToken.None); // Assert Assert.IsType <Sensor>(sensor); Assert.NotNull(sensor); }