datetime-moq2.cs

public class UberQualityService
{
DateTimeService _dateService;

public UberQualityService(DateTimeService dateService)
{
  _dateService = dateService
}
public async bool SaveCustomer(string data)
{       
    if (data != null)
    {
        var customer = JsonConvert.DeserializeObject<Customer>(data);
        if(_dateService.GetDayOfWeek() == DayOfWeek.Friday)
        {
            //Database save logic
            return true;
        }
        else
        {
            return false;
        }
    }            
}
}

public class DateTimeService
{
  public DayOfWeek GetDayOfWeek();
}

[Fact]
public void SaveMethodShouldCallOnce()
{
    //Arrange
    var mockValidator = new Mock<DateTimeService>();
    mockValidator.Setup(x => x.GetDayOfWeek()).Returns(DayOfWeek.Friday);
    var sut = new UberQualityService(mockValidator.Object);
    var customer = new Customer { Age = 30 };
    
    //Act
    var returnValue = sut.Evaluate(customer.Serialize());
    
    //Assert
    Assert.True(returnValue);
}