public void ApplyShouldDeleteChar(int position)
{
state.CurrentPosition = position;
command = new BackspaceCommand();
var oldState = new ControllerState(state);
var result = command.Apply(state);
result.Should().BeTrue();
state.Text.ToString().Should().BeEquivalentTo(oldState.Text.Remove(position - 1, 1).ToString());
state.CurrentPosition.Should().Be(position - 1);
}
public void RevertShouldRestoreState(int position)
{
state.CurrentPosition = position;
command = new BackspaceCommand();
var oldState = new ControllerState(state);
var applyResult = command.Apply(state);
applyResult.Should().BeTrue();
var result = command.Revert(state);
result.Should().BeTrue();
state.Should().Be(oldState);
}
public void Backspace()
{
if (this.document.Length() == 0)
{
return;
}
IUndoableCommand command = new BackspaceCommand(this.document);
this.undoStack.Push(command);
this.redoStack.Clear();
command.Execute();
}
