public void TestCompositeCommand()
{
PositiveInt x = new PositiveInt();
CompositeCommand composite1 = new CompositeCommand("1", new Command[] { new IncCommand(x), new IncCommand(x) });
composite1.Do();
Assert.IsTrue(x.Value == 2);
composite1.Undo();
Assert.IsTrue(x.Value == 0);
CompositeCommand composite2 = new CompositeCommand("1", new Command[] { new IncCommand(x), new DecCommand(x), new DecCommand(x) });
// Try to execute a composite that will cause an exception
try
{
composite2.Do();
Assert.Fail();
}
catch
{
}
Assert.IsTrue(x.Value == 0); // make sure command was backed out
}
