How to compare Lists in Unit Testing

Question

How can this test fail?

[TestMethod]
public void Get_Code()
{
    var expected = new List();
    expected.A         


        

Answer 1

To make assertions about collections, you should use CollectionAssert:

CollectionAssert.AreEqual(expected, actual);

List doesn't override Equals, so if Assert.AreEqual just calls Equals, it will end up using reference equality.