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From "Luc Maisonobe (JIRA)" <>
Subject [jira] [Commented] (MATH-553) Bug in class# org.apache.commons.math.dfp.Dfp / org.apache.commons.math.linear.RealVectorwith reproducible JUnit test
Date Sun, 03 Apr 2011 20:55:05 GMT


Luc Maisonobe commented on MATH-553:

Yes, I think these comments are helpful.
They give an hint about what to look at. In both cases, I add to run the test in a debugger
to see exactly what happened but the comment showed me exactly the variable to look at. I
don't know how you generate these comments, would it be possible to have both the information
about the values that make the test pass and the value that did make the test fail ? This
would allow the reader to simply compare these values without having to run a debugger by
himself. If this is not possible, the current comments already provide valuable information.

> Bug in class# org.apache.commons.math.dfp.Dfp / org.apache.commons.math.linear.RealVectorwith
reproducible JUnit test
> ---------------------------------------------------------------------------------------------------------------------
>                 Key: MATH-553
>                 URL:
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 2.2
>         Environment: jdk 1.6
>            Reporter: Sai Zhang
>         Attachments:
> Hi all:
> I am writing an automated bug finding tool, and using
> Apache Commons Math as an experimental subject
> for evaluation.
> The tool creates executable JUnit tests as well as
> explanatory code comments. I attached one bug-revealing
> test as follows. Could you please kindly check it, to
> see if it is a real bug or not?
> Also, it would be tremendous helpful if you could give
> some feedback and suggestion on the quality of generated code comments?
> From the perspective of developers who are familiar with the code,
> is the automatically-inferred comment useful in understanding
> the generated test? is the comment helpful in bug fixing from the
> perspective of developers?
> Particularly when the automatically-generated tests
> are often long.
> Your suggestion will help us improve the tool.
> Please see attachment for the failed test.
> The comment appears in the form of:
> //Tests pass if .... (it gives some small change to the test which can make the failed
test pass)
> For example:
> //Test passes if var10 is: (double)<0
> java.lang.Double var10 = new java.lang.Double(0.0d);
> means if you change var10 to a double value which is < 0 (e.g., -1d), the failed test
will pass

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