The Inner Life of a Test Framework
As mere users of a test framework, we should not bother about its internal structure, unless we are programmers and, as such, interested in the inner parts of each piece of software we can get a hold of. In addition, unit testing is such an individual activity that we may sometimes not get around expansions and adaptations of the framework. JUnit does not cover every functionality anyone may need during testing; it is an open core that can be expanded and completed in different places. And if we find that JUnit limits our own test needs too much, then it may still serve us as an example for the benefits and drawbacks of certain design decisions in the development of our own test support tools.
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