Java Test-Driven Development Lab Exercise

1. Account balance exercise

Using TDD, complete the following exercise.

Create a new Account class, and a corresponding AccountTest class, using the process we’ve previously demonstrated in lecture.

Write the following tests for the Account class:

shouldIncreaseMyBalanceWhenIDepositMoney - This test should create an Account object, deposit $50, and then check the balance.
shouldDecreaseMyBalanceWhenIWithdrawMoney - This test should create an Account object, deposit $100, withdraw $50, and then check the balance.
shouldNotDecreaseMyBalanceWhenIWithdrawMoneyAndDoNotHaveEnoughToCoverTheWithdrawal - This test should create an Account object, deposit $50, withdraw $100, and then check the balance.

For each of the test cases:

Implement the test for that test case. Uncomment it and add a test code inside it.
Fix compile errors.
Watch the test fail.
Write now code that you expect to make the test pass.
Watch the test pass. If any of your tests fail, you should repeat step #4.
Commit your changes and go back to Step #1 for the next test case.

Given	When	Then
I have $100 in my account	I deposit $50	I see that my account contains $150
I have $100 in my account	I withdraw $50	I see that my account contains $50
I have $50 in my account	I withdraw $100	I see that my account contains $50

Using TDD, complete the following exercise.

Create a new Factorial class, and a corresponding FactorialTest class, using the process we’ve previously demonstrated in lecture.

Write the following tests for the Factorial class:

shouldReturnOneWhenNumberIsOne - This test should create a Factorial object, compute the factorial of 1, and then check the result.
shouldReturnTwoWhenNumberIsTwo - This test should create a Factorial object, compute the factorial of 2, and then check the result.
shouldReturnOneWhenNumberIsZero - This test should create a Factorial object, compute the factorial of 0, and then check the result.
shouldReturnSixWhenNumberIsThree - This test should create a Factorial object, compute the factorial of 3, and then check the result.
shouldThrowIllegalArgumentExceptionWhenNumberIsNegative - This test should create a Factorial object, compute the factorial of -1, and then check that an IllegalArgumentException is thrown.

For each of the test cases:

Implement the test for that test case. Uncomment it and add a test code inside it.
Fix compile errors.
Watch the test fail.
Write now code that you expect to make the test pass.
Watch the test pass. If any of your tests fail, you should repeat step #4.
Commit your changes and go back to Step #1 for the next test case.