public void Undo_PerformsUndo()
{
var commandExecutionManager = new CommandExecutionManager();
var commandMock = new Mock <ICommand>();
commandExecutionManager.ExecuteCommand(commandMock.Object);
commandExecutionManager.Undo();
commandMock.Verify(c => c.Undo(), Times.Once());
}
public void Redo_PerformsRedo()
{
var commandExecutionManager = new CommandExecutionManager();
var commandMock = new Mock <ICommand>();
commandExecutionManager.ExecuteCommand(commandMock.Object);
commandExecutionManager.Undo();
commandExecutionManager.Redo();
commandMock.Verify(c => c.Execute(), Times.Exactly(2));
}
public void ExecuteCommand_ClearsUndoHistory()
{
var commandExecutionManager = new CommandExecutionManager();
var commandMock = new Mock <ICommand>();
commandExecutionManager.ExecuteCommand(commandMock.Object);
commandExecutionManager.Undo();
commandExecutionManager.ExecuteCommand(commandMock.Object);
Assert.Throws <InvalidOperationException>(() => commandExecutionManager.Redo());
}
public void Undo_NothingToUndo_InvalidOperationException()
{
var commandExecutionManager = new CommandExecutionManager();
Assert.Throws <InvalidOperationException>(() => commandExecutionManager.Undo());
}