public void ShouldThrowExceptionWithUndoManyLevels()
{
User = new CommandPatern.User();
var ex = Assert.Throws <IndexOutOfRangeException>(() => User.Undo(4));
Assert.That(ex.Message, Is.EqualTo("Too much levels."));
}
public void ExecuteCalculator()
{
User = new CommandPatern.User();
var result = User.Compute('+', 10);
Assert.AreEqual(10, result);
}
public void ExecuteCalculatorSeveralTimes()
{
User = new CommandPatern.User();
var result = User.Compute('+', 10);
result = User.Compute('-', 5);
result = User.Compute('*', 1);
result = User.Compute('/', 5);
Assert.AreEqual(1, result);
}
public void ExecuteCalculatorRedo3levels()
{
User = new CommandPatern.User();
var result = User.Compute('+', 10);
result = User.Compute('-', 5);
result = User.Compute('*', 1);
result = User.Compute('/', 5);
var redo3 = User.Undo(2);
Assert.AreEqual(1, result);
Assert.AreEqual(5, redo3);
}
