Labs

In this set of labs we will create JUnit test cases and use Test-Driven Development (TDD).

1. Create a JUnit Test Case for the com.example.unittesting.labs.Calculator class, and use TDD to implement test methods and class functionality.

The Calculator class has five methods. * int add(int first, int second) * int subtract(int first, int second) - subtracts second from first * int multiply(int first, int second) * int divide(int numerator, int denominator) * double divide(double numerator, double denominator)

Be sure to make the test class in the test source folder, in the correct package.

Notes: * Clearly, implementing the methods is easy, but use TDD to create test methods first. * Be sure to test both divide methods, and that the method using ints loses any remainder. * Do not worry about testing Exceptions (to be explained later) or cases like dividing by zero.

(Solution: src/...solutions.Calculator, test/...solutions.CalculatorTests)

Optional: add a int modulus(int numerator, int denominator) method to your class and write test method(s) for it.

1. Create a set of test cases for the java.lang.String class.

Test the following String methods for the listed criteria: * contains() * Hello World! contains Hello returns true * Hello World! contains hello returns false * length() * Hello World! has length() equal to 12 * startsWith() * Hello World! starsWith Hello returns true * Hello World! startsWith hello returns false * toUpperCase() * "Hello World!" toUppercase returns HELLO WORLD!

(Solution: StringTests.java)

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