public void Result_extend_an_array_with_x_values()
{
List <int> array = new List <int> {
1, 2, 3
};
List <int> expectedArray = new List <int> {
1, 2, 3, 4
};
List <int> actual = arraySorter.extendAnArray(array);
CollectionAssert.AreEqual(expectedArray, actual);
}
