public void TestIndexOf() { Bitmap magic = new Bitmap(16, 24); for (int i = 0; i < 4; i++) { array.Add(new Bitmap(16, 24)); } array.Add(magic); for (int i = 0; i < 4; i++) { array.Add(new Bitmap(16, 24)); } Bitmap magic2 = new Bitmap(16, 24); Assert.AreEqual(4, array.IndexOf(magic)); Assert.AreEqual(-1, array.IndexOf(magic2)); array.Add(magic2); Assert.AreEqual(9, array.IndexOf(magic2)); }