Problem: Java Comparable Interface with Constructor

[Roy Hattlesby]

I love Cobertura and think that it is a significant contibution in the quest to improve the lives of many around the world...  Well done team Cobertura !

I'm using Cobertura 1.9.2 and Java 1.6 with Maven 2 on WindowsVISTA (Yes, Windoze does suck!)

I've had NO problem maintaining 100% coverage (not that that is the objective) EXCEPT FOR the following situation that I'm at a loss to account for. I've spent some time Googling and looking on the Cobertura site for answers but have had no luck with resolution to this little annoyance -- I accept that I must have an Obsessive Compulsive personality. I suspect that I'm doing something really dumb but CANNOT for the life of me see what it is.  Therefore, your help would be greatly appreciated.

Let us assume that I have a really simple HelloWorld class (HelloWorld.java) that implements the interface Comparable<HelloWorld>.  Please see below:


    public final class HelloWorld implements Comparable<HelloWorld>
    {    ...
        public final int compareTo( HelloWorld other )
        {
            return 0;    // this is *NOT* a sound implementation of compareTo(...)
        }
    }

In a test class, a simple instantiation of HelloWorld and call to compateTo(...) causes Cobertura to report 100% coverage.  I love it -- ALL GOOD!

HOWEVER, as soon as I add a default/null (no argument) constructor to the HelloWorld class (which implements Comparable<HelloWorld> -- please see below -- then Cobertura reports that the class declaration is NOT covered by testing code:

    public final class HelloWorld implements Comparable<HelloWorld>  // this line reported RED (and I don't understand why)
    {    ...
        public XXX()
        {
            // this method verbose... BUT conceptually sound
            super();
            return;
        }

        public final int compareTo( XXX other )
        {
            return 0;
        }
    }

I cannot see how I can write any testing code to cause Cobertura to report 100% test coverage for my HelloWorld class when (1) HelloWorld implements Comparable<HelloWorld>, and (2) HelloWorld offers a default/null (no argument) constructor ?  I'd like to see my Cobertura report 100%   ! ....   Thanks in advance for you help with what must be a dumb newbie confusion on my part,,,

RoyQ


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