Imagine that we are writing a payroll system. This system has a number of functions.

• We can add employees to the payroll database.
• We can change existing employees.
• We can request that paychecks be created for a given payday.

Paychecks are output to a file in a simple text format.

We'd like to test this system. Here are a few acceptance tests to think about:

^AddAndPayTest	This test adds a few employees, pays them, and then checks to be sure that their paychecks are correct.
^ChangeBetweenTwoPaydays	This test adds some employees, pays them, then adds one more and changes an existing on. then pays again and checks to make sure the paychecks are correct.

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^SetUp