public void ShouldCorrectlyExecuteTheCommands()
{
//arrange
var obj = new ValueObject() { Number = 1 };
var context = new CommandExecutionContext(handler);
//act
context.Execute(new AddOneCommand(obj));
//assert
Assert.AreEqual(2, obj.Number);
}
public void ShouldCorrectlyUndoAndRedoActions()
{
var obj = new ValueObject() { Number = 1 };
handler.Execute(new AddOneCommand(obj));
Assert.AreEqual(2, obj.Number);
handler.Undo();
Assert.AreEqual(1, obj.Number);
handler.Redo();
Assert.AreEqual(2, obj.Number);
}
public void ShouldFailSilentlyWhenUndoingMultipleTimes()
{
//arrange
var hasFailed = false;
var valueObj = new ValueObject();
handler.Execute(new AddOneCommand(valueObj));
//act
//execute a couple of times
handler.Undo();
try
{
handler.Undo(); //this should fail as there is nothing to be undone
}
catch (ApplicationException)
{
hasFailed = true;
}
//assert
Assert.AreEqual(0, valueObj.Number);
Assert.IsTrue(hasFailed, "The 2nd undo operation should have failed");
}
public void ShouldUndoAndRedoMultipleLevels()
{
//arrange
var valueObj = new ValueObject();
for (int i = 0; i < 5; i++)
{
handler.Execute(new AddOneCommand(valueObj));
}
Assert.AreEqual(5, valueObj.Number);
//exec
handler.Undo(3);
//assert
Assert.AreEqual(2, valueObj.Number);
//redo
handler.Redo(2);
Assert.AreEqual(4, valueObj.Number);
}
public AddTwoCommand(ValueObject valObj)
{
this.valObj = valObj;
}