public void GetFizzBuzzText_ReturnsFizzBuzzTextGeneratedFromService()
{
//Arrange
//"Mock the service so that it always returns some (randomly generated) string"
var expectedText = Guid.NewGuid().ToString();
_serviceMock.Setup(s => s.GenerateFizzBuzzText(It.IsAny <int>(), It.IsAny <int>(), It.IsAny <int>())).Returns(expectedText);
//Act
var result = _controller.GetFizzBuzzText(It.IsAny <int>(), It.IsAny <int>(), It.IsAny <int>()) as OkNegotiatedContentResult <string>;
//Assert
//TODO: assert that the correct IHttpActionResult is returned
//TODO: assert that the FizzBuzzService was used correctly
Assert.That(result, Is.Not.Null);
Assert.That(result.Content, Is.EqualTo(expectedText));
_serviceMock.Verify(s => s.GenerateFizzBuzzText(It.IsAny <int>(), It.IsAny <int>(), It.IsAny <int>()), Times.Once);
}