Question

Using NUnit 2.2 on .NET 3.5, the following test fails when using DateTime.Equals. Why?

[TestFixture] public class AttributeValueModelTest {     public class HasDate     {         public DateTime? DateValue         {             get             {                 DateTime value;                 return DateTime.TryParse(ObjectValue.ToString(), out value) ? value : new DateTime?();             }         }          public object ObjectValue { get; set; }     }      [Test]     public void TwoDates()     {         DateTime actual = DateTime.Now;         var date = new HasDate {ObjectValue = actual};         Assert.IsTrue(date.DateValue.Value.Equals(actual));     } } 

Answer 1

The dates aren’t equal. TryParse drops some ticks. Compare the Tick values.

For one test run:

Console.WriteLine(date.DateValue.Value.Ticks); Console.WriteLine(actual.Ticks); 

Yields:

633646934930000000 633646934936763185