public void EmptyDeregisterTest()
{
repo = new Repository();
repo.Deregister("item1");
string result = repo.Retrieve("item1");
Assert.AreEqual(string.Empty, result);
}
public void DeregisterTest()
{
repo = new Repository();
repo.Deregister("item3");
//validate content
string item3 = repo.Retrieve("item3");
Assert.AreEqual(string.Empty, item3);
}