public void TestDeletionsUndoRedo()
{
// Ensure the recorder is in its default states.
Assert.AreEqual(false, recorder.CanUndo);
Assert.AreEqual(false, recorder.CanRedo);
// Add models into workspace, make sure they exist.
workspace.AddModel(new DummyModel(1, 10));
workspace.AddModel(new DummyModel(2, 20));
Assert.AreNotEqual(null, workspace.GetModel(1));
Assert.AreNotEqual(null, workspace.GetModel(2));
// Make sure we can now undo.
Assert.AreEqual(true, recorder.CanUndo);
Assert.AreEqual(false, recorder.CanRedo);
// Delete the inserted models and make sure they're gone.
workspace.RemoveModels(new int[] { 1, 2 });
Assert.AreEqual(null, workspace.GetModel(1));
Assert.AreEqual(null, workspace.GetModel(2));
// Make sure we can now undo.
Assert.AreEqual(true, recorder.CanUndo);
Assert.AreEqual(false, recorder.CanRedo);
recorder.Undo(); // Undo the deletion (undo's still possible).
Assert.AreEqual(true, recorder.CanUndo);
Assert.AreEqual(true, recorder.CanRedo);
// Make sure the deletion has been undone.
Assert.AreNotEqual(null, workspace.GetModel(1));
Assert.AreNotEqual(null, workspace.GetModel(2));
recorder.Undo(); // Undo the creation.
Assert.AreEqual(true, recorder.CanUndo);
Assert.AreEqual(true, recorder.CanRedo);
// Make sure the creation of '2' has been undone.
Assert.AreNotEqual(null, workspace.GetModel(1));
Assert.AreEqual(null, workspace.GetModel(2));
recorder.Undo(); // Undo the creation.
Assert.AreEqual(false, recorder.CanUndo);
Assert.AreEqual(true, recorder.CanRedo);
// Make sure the creation of '1' has been undone.
Assert.AreEqual(null, workspace.GetModel(1));
Assert.AreEqual(null, workspace.GetModel(2));
recorder.Redo(); // Redo the creation of '1'.
Assert.AreEqual(true, recorder.CanUndo);
Assert.AreEqual(true, recorder.CanRedo);
// Make sure the creation of '1' has been redone.
Assert.AreNotEqual(null, workspace.GetModel(1));
Assert.AreEqual(null, workspace.GetModel(2));
recorder.Redo(); // Redo the creation of '2'.
Assert.AreEqual(true, recorder.CanUndo);
Assert.AreEqual(true, recorder.CanRedo);
// Make sure the creation of '2' has been redone.
Assert.AreNotEqual(null, workspace.GetModel(1));
Assert.AreNotEqual(null, workspace.GetModel(2));
recorder.Redo(); // Redo the deletion.
Assert.AreEqual(true, recorder.CanUndo);
Assert.AreEqual(false, recorder.CanRedo);
// Make sure the model has been deleted.
Assert.AreEqual(null, workspace.GetModel(1));
Assert.AreEqual(null, workspace.GetModel(2));
}
