public void TestModificationUndoRedo00()
{
// Ensure the recorder is in its default states.
Assert.AreEqual(false, recorder.CanUndo);
Assert.AreEqual(false, recorder.CanRedo);
// Add a model into workspace, make sure it exists.
workspace.AddModel(new DummyModel(1, 10));
DummyModel inserted = workspace.GetModel(1);
Assert.AreNotEqual(null, inserted);
Assert.AreEqual(10, inserted.Radius);
// Make sure we can now undo.
Assert.AreEqual(true, recorder.CanUndo);
Assert.AreEqual(false, recorder.CanRedo);
// Double the radius property...
workspace.ModifyModel(1);
DummyModel modified = workspace.GetModel(1);
Assert.AreNotEqual(null, modified);
Assert.AreEqual(20, modified.Radius);
// Make sure we can still undo.
Assert.AreEqual(true, recorder.CanUndo);
Assert.AreEqual(false, recorder.CanRedo);
recorder.Undo(); // Undo the modification (undo's still possible).
Assert.AreEqual(true, recorder.CanUndo);
Assert.AreEqual(true, recorder.CanRedo);
// Make sure the modification has been undone
DummyModel undone = workspace.GetModel(1);
Assert.AreNotEqual(null, undone);
Assert.AreEqual(10, undone.Radius);
recorder.Redo(); // Redo the modification.
Assert.AreEqual(true, recorder.CanUndo);
Assert.AreEqual(false, recorder.CanRedo);
// Make sure the modification has been undone
DummyModel redone = workspace.GetModel(1);
Assert.AreNotEqual(null, redone);
Assert.AreEqual(20, redone.Radius);
}
