A simple coverage example - NCover 4 - Agile series I

The failing test, TestMultiply, decreases the coverage % plus the two methods, Subtract and Divide, do not have unit tests, which also decreases the coverage. 

    [TestFixture]

    class TestCoverage_Class2

    {

        Coverage_Class1 initCoverage = new Coverage_Class1(55, 12);

        [Test]

        public void TestAdd()

        {

            Assert.AreEqual(67,initCoverage.Add());

        }

        [Test]

        public void TestMultiply()

        {

            Assert.AreEqual(60, initCoverage.Multiply());

        }

    }

// Domain class being tested

public class Coverage_Class1

    {

        int firstValue, secondValue;

        public Coverage_Class1(int a, int b)

        {

            firstValue = a;

            secondValue = b;

        }

        public int Add()

        {

            return firstValue + secondValue;

        }

        public int Multiply()

        {

            return firstValue * secondValue;

        }

        public int Subtract()

        {

            return firstValue - secondValue;

        }

        public int Divide()

        {

            return firstValue / secondValue;

        }

    }

Write the two tests for the additional two methods, Divide and Subtract, with one of them a failing test and the coverage looks like this:

Make them all pass and voila, 100 % coverage  !

Work around with the Threshhold values and you will increase your own coverage capabilities ! :) Happy Coverage! :)