public void GetDifferenceBetweenDates_returnsValueFromProcessor()
{
//Arrange
Mock <ITimeframeProcessor> mockProcessor = new Mock <ITimeframeProcessor>();
mockProcessor.Setup(p => p.CountTimeUnits(It.IsAny <DateTime>(), It.IsAny <DateTime>(), It.IsAny <int>())).Returns(10);
Timeframe timeframe = defaultTimeframe();
timeframe.InjectTimeframeProcessor(mockProcessor.Object);
//Act.
int difference = timeframe.GetDifferenceBetweenDates(new DateTime(), new DateTime());
//Assert.
Assert.AreEqual(10, difference);
}