NUnit's logic for comparing arrays - use Comparer<T[]> if it is provided.

In the following code snippet, NUnit uses passed comparer as elements' comparer, which prevents us from treating array types just like any other data types in unit tests. The workaround is to check for equality in the following way - Assert.AreEqual(0, comparer.Compare(expected, actual))).

[TestFixture]
public class NUnitFeatures
{
   [Test]
   public void CustomArrayComparison()
   {
      Assert.That(new[] { 1 }, Is.EqualTo(new[] { 1 }).Using(new IntArrayComparer()));
   }

   class IntArrayComparer : IComparer<int[]>
   {
      public int Compare(int[] x, int[] y) { return 0; } // just a stub
   }
}

Google groups discussion:
http://groups.google.com/group/nunit-discuss/browse_thread/thread/792d9afbe01f7892