public void SwapTest()
{
//Arrange
int a = 10;
int b = 5;
int expectedA = 5;
int expectedB = 10;
string expected = "510";
//Act
SortingAlgorithms.Swap(ref a, ref b);
string actual = a.ToString() + b.ToString();
//Assert
//Assert.AreEqual(expectedA,a);
Assert.AreEqual(expected, actual);
}