After your first burst of obvious tests, make notes about what else needs testing. Some of your notes will turn
into formal test series: well-documented groups of tests that you will probably use each time you test a new
version of the program. Figure 1.4 is a test series that covers the valid inputs to the program—pairs of
numbers that the program should add correctly.
In the first test, you entered two numbers, didn't try to change them, and examined the result. Another
39,600 tests are similar to this.' It would be crazy to run them all. Figure 1.4 includes only eight of them. How
did we narrow it down to these eight? A minor factor in determining specific values was that we wanted to
use each digit at least once. Beyond that, we restricted the choices to the tests that we considered most likely
to reveal problems. A powerful technique for finding problem cases is to look for boundary conditions.
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