public void CanUndoWhenACommandHasBeenExecuted()
{
var commandStack = new CommandStack();
var mockCommand = new Mock<ICommand>();
commandStack.Execute(mockCommand.Object);
Assert.IsTrue(commandStack.CanUndo());
}
public void CanNotRedoWhenACommandIsUndoneThenAnotherCommandIsExecuted()
{
var commandStack = new CommandStack();
var mockCommand = new Mock<ICommand>();
var mockCommand2 = new Mock<ICommand>();
commandStack.Execute(mockCommand.Object);
commandStack.Undo();
commandStack.Execute(mockCommand2.Object);
Assert.IsFalse(commandStack.CanRedo());
}
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 ExecuteCommandCallsApplyOnTheCommand()
{
var mockCommand = new Mock<ICommand>();
var commandStack = new CommandStack();
commandStack.Execute(mockCommand.Object);
mockCommand.Verify(command => command.Apply(), Times.Exactly(1));
}
public void CanNotUndoWhenNoCommandsHaveBeenExecuted()
{
var commandStack = new CommandStack();
Assert.IsFalse(commandStack.CanUndo());
}
public void UndoCallsRevertOnTheLastCommandExecuted()
{
var commandStack = new CommandStack();
var mockCommand1 = new Mock<ICommand>();
var mockCommand2 = new Mock<ICommand>();
commandStack.Execute(mockCommand1.Object);
commandStack.Execute(mockCommand2.Object);
commandStack.Undo();
mockCommand1.Verify(command => command.Apply(), Times.Exactly(1));
mockCommand1.Verify(command => command.Revert(), Times.Exactly(0));
mockCommand2.Verify(command => command.Apply(), Times.Exactly(1));
mockCommand2.Verify(command => command.Revert(), Times.Exactly(1));
}