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>Unit Testing</H1
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>What Is Unit Testing ?</H1
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>Most regression testing as done by DejaGnu is system
      testing. This is the complete application is tested all at
      once. Unit testing is for testing single files, or small
      libraries. In this case, each file is linked with a test case in
      C or C++, and each function or class and method is tested in
      series, with the test case having to check private data or
      global variables to see if the function or method worked.</P
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>This works particularly well for testing APIs and at level
      where it is easier to debug them, than by needing to trace through
      the entire appication. Also if there is a specification for the
      API to be tested, the testcase can also function as a compliance
      test.</P
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