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Bugs item #2075537, was opened at 2008-08-26 03:13
Message generated for change (Comment added) made by nobody
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=720015&aid=2075537&group_id=130558

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Category: None
Group: None
Status: Open
Resolution: Accepted
Priority: 5
Private: No
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: Branch coverage for switch statement fall-through cases

Initial Comment:
I'm currently using Cobertura 1.9, and I think it may be miscalculating branch coverage for a switch statement; cases which fall-through to the following case do not seem to be recognised as covered.

I've got the following code:

    public enum AnEnumeration
    {
        FOO, BAR, GONK
    };

    public boolean someMethod(AnEnumeration e)
    {
        switch (e)
        {
            case FOO:
            case BAR:
            case GONK:
                return true;

            default:
                return false;
        }
    }

The unit-test is checking all of the values in the enumeration but not the default case, so I'd expect to see branch coverage of 75% (3 out of 4 branches covered). However, the HTML coverage report seems to indicate that the branches aren't covered at all -- the calculated branch coverage is 25% (1/4).

Interestingly, I've tried changing the switch statement to remove the fall-through behaviour:

    public boolean someMethod(AnEnumeration e)
    {
        switch (e)
        {
            case FOO:
                return true;

            case BAR:
                return true;

            case GONK:
                return true;

            default:
                return false;
        }
    }

With the above code and the same unit-test, Cobertura indicates that the branches are covered and gives the expected coverage figure of 75% (3/4). So, to my uneducated eye, this looks like the fall-through behaviour is somehow confusing the branch coverage calculation.

In case it matters, I'm using Java 5.

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Comment By: John Lewis (lewijw)
Date: 2011-01-24 15:53

Message:
Changes to the way switch statments are reported will probably go in the
next release.  Please see:

http://sourceforge.net/mailarchive/forum.php?thread_name=EC3002866D5A9D4887210D53E3DA563914CB1E64%40MERCMBX03D.na.SAS.com&forum_name=cobertura-devel

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=720015&aid=2075537&group_id=130558

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