public void LookupChangeTest()
        {
            LoadChangeSetXml(true);
            ChangesetStorage storage = new ChangesetStorage(Filename);

            CvsChange change = CreateSingleChange("test.ext", 0, "Update to TK-01001");
            storage = new ChangesetStorage(Filename);

            CvsChange foundChange = storage.LookupChange(change);
            Assert.IsNotNull(foundChange);
            Assert.AreEqual(foundChange, change);

            foundChange = storage.LookupChange(CreateSingleChange("test.ext", 0, "ttt"));
            Assert.IsNull(foundChange);
        }