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>DejaGnu uses a single header file to assist in unit
      testing. As this file also produces it's one test state output,
      it can be run standalone, which is very useful for testing on
      embedded systems. This header file has a C and C++ API for the
      test states, with simple totals, and standardized
      output. Because the output has been standardized, DejaGnu can be
      made to work with this test case, without writing almost any
      Tcl. The library module, dejagnu.exp, will look for the output
      messages, and then merge them into DejaGnu's.</P
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