xUnit : Assert two List<T> are equal?

xUnit.Net recognizes collections so you just need to do

Assert.Equal(expected, actual); // Order is important

You can see other available collection assertions in CollectionAsserts.cs

For NUnit library collection comparison methods are

CollectionAssert.AreEqual(IEnumerable, IEnumerable) // For sequences, order matters

and

CollectionAssert.AreEquivalent(IEnumerable, IEnumerable) // For sets, order doesn't matter

More details here: CollectionAssert

MbUnit also has collection assertions similar to NUnit: Assert.Collections.cs

In the current version of XUnit (1.5) you can just use

Assert.Equal(expected, actual);

The above method will do an element by element comparison of the two lists. I'm not sure if this works for any prior version.

With xUnit, should you want to cherry pick properties of each element to test you can use Assert.Collection.

Assert.Collection(elements, 
  elem1 => Assert.Equal(expect1, elem1.SomeProperty),
  elem2 => { 
     Assert.Equal(expect2, elem2.SomeProperty);
     Assert.True(elem2.TrueProperty);
  });

This tests the expected count and ensures that each action is verified.