public void ExecuteACommandUndoExecuteACommandThenRedoDoesNotCallApplyOnSecondCommand()
{
var commandStack = new CommandStack();
var mockCommand1 = new Mock<ICommand>();
var mockCommand2 = new Mock<ICommand>();
commandStack.Execute(mockCommand1.Object);
commandStack.Undo();
commandStack.Execute(mockCommand2.Object);
commandStack.Redo();
mockCommand1.Verify(command => command.Apply(), Times.Exactly(1));
mockCommand1.Verify(command => command.Revert(), Times.Exactly(1));
mockCommand2.Verify(command => command.Apply(), Times.Exactly(1));
mockCommand2.Verify(command => command.Revert(), Times.Exactly(0));
}
public void RedoCallsApplyOnTheLastCommandUndone()
{
var commandStack = new CommandStack();
var mockCommand1 = new Mock<ICommand>();
var mockCommand2 = new Mock<ICommand>();
commandStack.Execute(mockCommand1.Object);
commandStack.Execute(mockCommand2.Object);
commandStack.Undo();
commandStack.Redo();
mockCommand1.Verify(command => command.Apply(), Times.Exactly(1));
mockCommand1.Verify(command => command.Revert(), Times.Exactly(0));
mockCommand2.Verify(command => command.Apply(), Times.Exactly(2));
mockCommand2.Verify(command => command.Revert(), Times.Exactly(1));
}