The behavor of TestSuite.createTestFinder() is unspecified. The general contract for this method should be described:
   a) testsuite.jtd entry is used.
   b) if jtd file is found, then the binary test finder is used.
   c) If no jtd file found , and no "finder" in testsuite.jtt,
      it is not specified that HTMLTestFinder is used.

Also the description of HTMLTestFinder doesn't specify that DIR_WALK is the default mode.