Boundary Analysis

For every method-under-test there is a set of valid preconditions and arguments. It is the domain of all possible values that allows the method to work properly. That domain defines the method’s boundaries. Boundary testing requires analysis to determine the valid preconditions and the valid arguments. Once these are established, you can develop tests to verify that the method guards against invalid preconditions and arguments.

Boundary-value analysis is about finding the limits of acceptable...