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From "Sai Zhang (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 21:07:06 GMT


Sai Zhang commented on MATH-553:

Thanks Luc for your comments.

I used a statistical algorithm to summarize the properties of a set of
"failure-correcting" objects. A technical report
describing the technique is on its way.

Yes, it is possible to have both an example value which make the test pass
(we have already implemented it
in our tool). For the reported test, the generated comment is: (after
appending an example value):

//Test passes if var10 is: (double)<0, for example, -1.0d
 java.lang.Double var10 = new java.lang.Double(0.0d);

The value making the test fail is already shown in the test (var10 = 0.0d in
the above test).




> 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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