Calculator Application contains 3 basic functionalities

1. Addition
2. Subtraction
3. Multiplication

Write Calculator Application using Test Driven Development

Steps:

Create a TestClass: "TestCalculator"

1. Create a Test Method: "testAddition"

   • Implement addition() method which takes two integer parameter and returns integer result int addition(int a, in b)

   • verify addition function with below input/output

     Input / Output:

     25, 20  --> 45
     5, 10   --> 15 
     

2. Create a Test Method: "testSubtraction"

   • Implement subtraction() method which takes two integer parameter and returns integer result int subtraction(int a, in b)

   • verify subtraction function with below input/output

     Input / Output:

     25, 20  --> 5
     40, 10   --> 30 
     

3. Create a Test Method: "testMultiplication"

   • Implement multiplication() method which takes two integer parameter and returns integer result int testMultiplication(int a, in b)

   • verify multiplication function with below input/output

     Input / Output:

     25, 20  --> 5
     40, 10   --> 30 
     

4. Create a Test Method: "testDivision"

   • Implement division() method which takes two integer parameter and returns integer result int testMultiplication(int a, in b)

   • verify multiplication function with below input/output

     Input / Output:

     25, 20  --> 5
     40, 10   --> 30 
     

   • Verify if someone divides by zero, an exception should be thrown.