public async Task StatsService_GetDnaStatsAsync_40MutantsAnd100Humans_Succeeds()
{
//Arrange
StatsService service = GetStatsService();
_memoryCacheServiceMock.Setup(x => x.GetAsync("mutantsCount", It.IsAny <Func <Task <int> > >())).ReturnsAsync(40).Verifiable();
_memoryCacheServiceMock.Setup(x => x.GetAsync("humansCount", It.IsAny <Func <Task <int> > >())).ReturnsAsync(100).Verifiable();
//Action
DnaStats result = await service.GetDnaStatsAsync();
//Asserts
Assert.IsNotNull(result);
Assert.AreEqual(40, result.CountMutantDna);
Assert.AreEqual(100, result.CountHumanDna);
Assert.AreEqual(0.4m, result.Ratio);
_memoryCacheServiceMock.Verify(x => x.GetAsync("mutantsCount", It.IsAny <Func <Task <int> > >()), Times.Once);
_memoryCacheServiceMock.Verify(x => x.GetAsync("humansCount", It.IsAny <Func <Task <int> > >()), Times.Once);
}