public void UpdateDeltaGood(string id, string content, string linerange)
{
Mock <Delta> deltaDouble2 = new Mock <Delta>();
deltaDouble2.Setup(delta2 => delta2.FileId).Returns(id);
deltaDouble2.Setup(delta2 => delta2.Content).Returns(content);
deltaDouble2.Setup(delta2 => delta2.LineRange).Returns(linerange);
delta2 = deltaDouble2.Object;
FakeDBManager fakeDatabase = new FakeDBManager();
fakeDatabase.AddDelta(delta);
fakeDatabase.UpdateDelta(delta2);
Assert.AreEqual(fakeDatabase.GetDelta(delta.FileId).Content, delta2.Content);
Assert.AreEqual(fakeDatabase.GetDelta(delta.FileId).LineRange, delta2.LineRange);
}