public void ShouldGetLatestBloodPressureDate()
{
//Given
var date = new DateTime(2018, 1, 4);
_healthRepository.Setup(x => x.GetLatestBloodPressureDate()).Returns(date);
//when
var latestDate = _healthService.GetLatestBloodPressureDate(DateTime.MinValue);
//then
Assert.Equal(date, latestDate);
}