Question

This is first attempt at unit testing. My .Equals method is failing on TestSet_Equals_True, TestSet_Equals_True_Shuffled_Order. Hoping for clarification as to whether this is a problem with HOW I Unit test or something is wrong with my .Equals method.

Unit Test:

private void Populate(Set set, int count)
{
    for (int i = 0; i < count; ++i)
        set.Add(i);
}

[TestMethod]
public void TestSet_Equals_True()
{
    Set set1 = new Set();
    Set set2 = new Set();

    Populate(set1, POPULATE_COUNT);
    Populate(set2, POPULATE_COUNT);
    bool expected = true;
    bool actual = set1.Equals(set2);
    Assert.AreEqual(expected, actual);
}

Class:

List<object> _set;

//Override Equals
public override bool Equals(object obj)
{
if (this.GetType() != obj.GetType())
    return false;
Set o = (Set)obj;

if (this._set.Count != o._set.Count)
    return false;

o._set.Sort();
this._set.Sort();

return _set.Equals(o._set); }

Answer 1

List<T> implementation of Equals is the default implementation of object.Equals – Reference Equality.

To see if two IEnumerable<T> are equal, You can use the extension method IEnumerable<T>.SequenceEquals – Don’t forget to add using statement for System.Linq namespace.

Good luck.