nunit-core team mailing list archive

[Charlie Poole <charlie@xxxxxxxxx>]

Hey Guys...

I'm visiting family and so not answering as quickly as usual...

I agree with Simone that the only good solution is to add a modifier to the
EqualConstraint, which would change how it compares DateTime objects. I
guess we should also add a comparison of DateTimeOffsets, even though it
wouldn't help Adam.

It's not necessary to implement generic constraints to use a modifier. We
already have modifiers like IgnoreCase, which which is only used when
strings are compared, so we could do the same thing here. Generics would be
nicer, but that's for the future.

One possibility:  Assert.That(dt1, Is.EqualTo(dt2).AsUtc);

Note that this would have to work with the Within modifier:
  Assert.That(dt1, Is.EqualTo(dt2).Within(5).Minutes.AsUtc);

There are exceptions possible when converting to UTC, but we could just
pass them on.

The alternative is to not support it and require prior conversion to UTC by
the caller.

Charlie


On Thu, Apr 25, 2013 at 1:05 AM, Adam Brengesjö <ca.brengesjo@xxxxxxxxx>wrote:

> Yea, I was inspired by your post and checked out the current
> implementation and noticed that TimeSpan has tolerance constraints in
> this way.
>
> But I agree it would by far would be better if it was context aware by
> using generics and the 'StrictDatetimeKind' (or what ever name) or the
> current tolerance properties for that matter, was not not available if
> not using the correct type.
>
> But on the other hand, if comparing two System.Object, the equality
> comparer should be able to detect that they are boxed value types, just
> as the current implementation does. This is a drawback of generics.
>
> --
> You received this bug notification because you are a member of NUnit
> Developers, which is subscribed to NUnit V2.
> https://bugs.launchpad.net/bugs/1172247
>
> Title:
>   Improve DateTime equality assertions to include DateTimeKind
>
> Status in NUnit V2 Test Framework:
>   New
>
> Bug description:
>   The following test will fail, even if the two DateTime structs are not
> equal.
>   (I know it's because the equality members of the DateTime type does the
> evaluation which doesn't care of the Kind property)
>
>   [Test]
>   public void Foo()
>   {
>       var localDate = new DateTime(2013, 04, 24, 13, 17, 44, 678,
> DateTimeKind.Local);
>       var systemDate = new DateTime(2013, 04, 24, 13, 17, 44, 678,
> DateTimeKind.Utc);
>
>       Assert.AreNotEqual(localDate, systemDate);
>   }
>
>   But I always extracts my assertions to a helper method which also
>   checks the Kind property.
>
>   public static class AssertX
>   {
>       public static void AreEqual(DateTime expected, DateTime actual)
>       {
>           Assert.AreEqual(expected, actual);
>           Assert.AreEqual(expected.Kind, actual.Kind);
>       }
>   }
>
>   I would like to have NUnit help me with this instead of always calling
>   my own helper class.
>
>   However, I'm not sure how this best could be implemented in NUnit.
>   A simple overload of AreEqual(object, object) to AreEqual(DateTime,
> DateTime) risk breaking compability with existing tests out there.
>
>   One way would be to instead use another name, Assert.Identical or
>   similar.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/nunitv2/+bug/1172247/+subscriptions
>
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-- 
You received this bug notification because you are a member of NUnit
Developers, which is subscribed to NUnit V2.
https://bugs.launchpad.net/bugs/1172247

Title:
  Improve DateTime equality assertions to include DateTimeKind

Status in NUnit V2 Test Framework:
  New

Bug description:
  The following test will fail, even if the two DateTime structs are not equal.
  (I know it's because the equality members of the DateTime type does the evaluation which doesn't care of the Kind property)

  [Test]
  public void Foo()
  {
      var localDate = new DateTime(2013, 04, 24, 13, 17, 44, 678, DateTimeKind.Local);
      var systemDate = new DateTime(2013, 04, 24, 13, 17, 44, 678, DateTimeKind.Utc);

      Assert.AreNotEqual(localDate, systemDate);
  }

  But I always extracts my assertions to a helper method which also
  checks the Kind property.

  public static class AssertX
  {
      public static void AreEqual(DateTime expected, DateTime actual)
      {
          Assert.AreEqual(expected, actual);
          Assert.AreEqual(expected.Kind, actual.Kind);
      }
  }

  I would like to have NUnit help me with this instead of always calling
  my own helper class.

  However, I'm not sure how this best could be implemented in NUnit.
  A simple overload of AreEqual(object, object) to AreEqual(DateTime, DateTime) risk breaking compability with existing tests out there.

  One way would be to instead use another name, Assert.Identical or
  similar.

To manage notifications about this bug go to:
https://bugs.launchpad.net/nunitv2/+bug/1172247/+subscriptions