public void AddRandomSimple()
        {
            var stubRandom = new StubIRandom();
            stubRandom.GetRandomNumber = () => { return -10; };

            calculator = new CalculatorViewModel(stubRandom);

            calculator.KeyCommand.Execute("100");
            calculator.AddCommand.Execute(null);
            calculator.AddRandomCommand.Execute(null);
            calculator.EquateCommand.Execute(null);

            Assert.AreEqual(90, calculator.CurrentValue);
        }
        public void AddRandomSimple()
        {
            var stubRandom = new StubIRandom();

            stubRandom.GetRandomNumber = () => { return(-10); };

            calculator = new CalculatorViewModel(stubRandom);

            calculator.KeyCommand.Execute("100");
            calculator.AddCommand.Execute(null);
            calculator.AddRandomCommand.Execute(null);
            calculator.EquateCommand.Execute(null);

            Assert.AreEqual(90, calculator.CurrentValue);
        }