public void EqualsCommandInClearStateShouldBeInvariantTest()
{
var calc = CalculatorFactory.BuildNew();
var state = new ClearState(calc);
state.Notify(new EqualsCommand());
Assert.IsTrue(calc.State is ClearState);
}
public void PointCommandShouldSetAccumulatorTest()
{
var calc = CalculatorFactory.BuildNew();
var state = new ClearState(calc);
Assert.IsTrue(calc.CPU.Accumulator.IsEmpty);
state.Notify(PointCommand.Instance);
Assert.IsTrue(calc.State is AccumulatorState);
Assert.IsTrue(calc.CPU.Accumulator.ToString() == "0.");
}