Examples of weka.test.Regression.diff()

weka.test.Regression.diff()
Returns the difference between the current output and the reference version. @return a String value illustrating the differences. If thisstring is empty, there are no differences. If null is returned, there was no reference output found, and the current output has been written as the reference. @exception IOException if an error occurs during reading or writing ofthe reference file.


    Regression reg = new Regression(this.getClass());
    Instances result = useFilter();
    reg.println(result.toString());
    try {
      String diff = reg.diff();
      if (diff == null) {
        System.err.println("Warning: No reference available, creating."); 
      } else if (!diff.equals("")) {
        fail("Regression test failed. Difference:\n" + diff);
      }

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      ex.printStackTrace();
      fail("Exception thrown on useFilter(): \n" + ex.getMessage());
    }
    reg.println(result.toString());
    try {
      String diff = reg.diff();
      if (diff == null) {
        System.err.println("Warning: No reference available, creating."); 
      } else if (!diff.equals("")) {
        fail("Regression test failed when using deprecated methods. Difference:\n" + diff);
      }

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