public void TestAdd0ToTTCReturns0()
        {
            // Arrange
            TestThisClass ttc = new TestThisClass(new Adder1For1());

            // Act
            // Assert
            Assert.AreEqual(0, ttc.GetNumer);
        }
        public void TestAdd1ToTTCReturns2()
        {
            // Arrange
            TestThisClass ttc = new TestThisClass(new Adder1For2());

            // Act
            ttc.AddNumber(1);
            // Assert
            Assert.AreEqual(2, ttc.GetNumer);
        }