public void Should_Output1Point1_WhenDoind3Point3Substract2Point2()
        {
            //arrange
            var outputServise = new Mock<IOutputServise>();
            var calculator = new CalculatorEngine(outputServise.Object);

            //act
            calculator.Substract(3.3, 2.2);

            //assert
            outputServise.Verify(x => x.Output(1.1), Times.Once());
        }
        public void Should_Return1Point1_WhenDoind3Point3Substract2Point2()
        {
            //arrange
            var outputServise = new Mock<IOutputServise>();
            var calculator = new CalculatorEngine(outputServise.Object);
            string expectedResult = "1,1000";

            //act
            calculator.Substract(3.3, 2.2);

            //assert
            Assert.AreEqual(calculator.correctResult, expectedResult);
        }