CalculatorWithTests/Tests/UnitTest1.cs

namespace Tests
{
    [TestClass]
    public class UnitTest1
    {
        //Positive

        [TestMethod]
        public void Sum21_and51_return72()
        {
            int a = 21;
            int b = 51;
            int except = 72;

            var calculator = new Calculator.Calculator();
            var actual = calculator.Add(a, b);

            Assert.AreEqual(actual, except);
        }

        [TestMethod]
        public void Sub2345_from7645_return5300()
        {
            int a = 7645;
            int b = 2345;
            int except = 5300;

            var calculator = new Calculator.Calculator();
            var actual = calculator.Subtract(a, b);

            Assert.AreEqual(actual, except);
        }

        [TestMethod]
        public void Mul44_by66_return2904()
        {
            int a = 44;
            int b = 66;
            int except = 2904;

            var calculator = new Calculator.Calculator();
            var actual = calculator.Multiply(a, b);

            Assert.AreEqual(actual, except);
        }

        [TestMethod]
        public void Div9_by2_return4_5()
        {
            int a = 9;
            int b = 2;
            float except = 4.5f;

            var calculator = new Calculator.Calculator();
            var actual = calculator.Divide(a, b);

            Assert.AreEqual(actual, except);
        }

        [TestMethod]
        public void Pow999_by0_return1()
        {
            int a = 999;
            int b = 0;
            int except = 1;

            var calculator = new Calculator.Calculator();
            var actual = calculator.Power(a, b);

            Assert.AreEqual(actual, except);
        }

        //Negative

        [TestMethod]
        public void Sum3_and4_notreturn8()
        {
            int a = 3;
            int b = 4;
            int except = 8;

            var calculator = new Calculator.Calculator();
            var actual = calculator.Add(a, b);

            Assert.AreNotEqual(actual, except);
        }

        [TestMethod]
        public void Sub4_from12_notreturn9()
        {
            int a = 12;
            int b = 4;
            int except = 9;

            var calculator = new Calculator.Calculator();
            var actual = calculator.Subtract(a, b);

            Assert.AreNotEqual(actual, except);
        }

        [TestMethod]
        public void Mul5_by66_notreturn331()
        {
            int a = 5;
            int b = 66;
            int except = 331;

            var calculator = new Calculator.Calculator();
            var actual = calculator.Multiply(a, b);

            Assert.AreNotEqual(actual, except);
        }

        [TestMethod]
        public void Div9_by3_notreturn4()
        {
            int a = 9;
            int b = 3;
            float except = 4;

            var calculator = new Calculator.Calculator();
            var actual = calculator.Divide(a, b);

            Assert.AreNotEqual(actual, except);
        }

        [TestMethod]
        public void Pow5_by5_notreturn625()
        {
            int a = 5;
            int b = 5;
            int except = 625;

            var calculator = new Calculator.Calculator();
            var actual = calculator.Power(a, b);

            Assert.AreNotEqual(actual, except);
        }
    }
}