public void GetByTimePeriod_ShouldCall_GetByTimePeriod_From_Repository()
{
_repositoryMock.Setup(repository =>
repository.GetByTimePeriod(It.IsAny <DateTimeOffset>(), It.IsAny <DateTimeOffset>()))
.Returns(new List <CpuMetric>());
_controller.GetByTimePeriod(DateTimeOffset.Now, DateTimeOffset.Now);
_repositoryMock.Verify(repository =>
repository.GetByTimePeriod(It.IsAny <DateTimeOffset>(), It.IsAny <DateTimeOffset>()), Times.AtMostOnce());
}