public void swappingElements()
{
// Setup
Recipe r1 = new Recipe(0);
Recipe r2 = new Recipe(0);
rm.Add(r1);
// Pre-condition
Assert.AreNotSame(r1, r2);
Assert.AreSame(r1, rm.GetRecipeAt(0));
// Exercise
bool success = rm.ChangeElement(0, r2);
// Verify
Assert.AreSame(r2, rm.GetRecipeAt(0));
Assert.AreEqual(true, success);
}
