White Box Testing: Test Requirements
We start by testing the requirements of the method, which means we are
testing the main functionality of the method. For
Paycheck.calculateRegularPay(), the main functionality is that the
method will return the employee’s regular pay for the given pay rate and
hours worked. The code for Paycheck.calculateRegularPay() is in Figure 5.
/**
* Returns the employee's regular pay for the hours worked up to the first
* REGULAR_PAY_MAX_HOURS hours worked.
*
* @param payRate employee's pay rate
* @param hoursWorked number of hours worked by the employee
* @return employee's regular pay
*/
public static int calculateRegularPay(int payRate, double hoursWorked) {
if (hoursWorked > REGULAR_PAY_MAX_HOURS) {
return payRate * REGULAR_PAY_MAX_HOURS;
}
return (int) (payRate * hoursWorked);
}
Figure 5: Implementation of the calculateRegularPay method in the Paycheck program.
A simple test is shown in Figure 6, below. Note that each piece of test
information is listed so that the information will be printed by the
testResult() method. The description is a String version of the method
call that generates the actual result for the test. Since the
Paycheck.calculateRegularPay() method returns a int, the result is
concatenated to the empty String to generate a String output for the
actual results.
/**
* Test the Paycheck.calculateRegularPay() method.
*/
@Test
public void testCalculateRegularPay() {
// Less than 40 hours
// Regular Level 1 36 hours
assertEquals("Paycheck.calculateRegularPay(Paycheck.LEVEL_1_PAY_RATE, 36)", 68400,
Paycheck.calculateRegularPay(Paycheck.LEVEL_1_PAY_RATE, 36));
}
Figure 6: Requirement test for Paycheck.calculateRegularPay() in PaycheckTest.