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+The code in this directory produces a test for Xdelta.  To run it you
+have to edit the hard-coded constants at the top of the file, which
+include "cmd_data_source", which should be the name of a big file
+containing source data that the test uses to construct sample inputs.
+This allows you to test on whatever kind of data you want, but the
+synthetic edits are still hardcoded.  Have a look.
+
+Of course, a better test would let you run it without any
+configuration, but this is not that test.