Branch you say? What branch?

When I use Cobertura to instrument my Grails Controllers, it doesn’t seem to accurately report on the branch coverage. For instance, the index closure in my controller looks like this:

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def index = {
	redirect(action:list,params:params)
}

The tests look like this:

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void testIndex(){
	stateController.index()
	assertEquals('/state/list', stateController.response.redirectedUrl)
}
 
void testIndexWithParams(){
	stateController.params.max=10
	stateController.index()
	assertEquals('/state/list?max=10', stateController.response.redirectedUrl)
}

I don’t believe there are actually two possible branches to that little line of code with the redirect (line 2 in the first code example), but Cobertura reports only 1 of 2 branches is covered. What do you think is the elusive second branch? Apparently I’m not the only one with that question – I found this post on the Groovy users mailing list, but no solution.

In fact, the entire class apparently has some issues with the branch coverage:

For me this may not be a huge deal since I’m mostly using this report as a guide to highlight areas of code that aren’t covered at all by tests. But it would be nice to not have simple lines of code (where branch coverage should really be N/A) highlighted in red on the report.

If you’re interested, here are the Controller and the Test – I think it should be pretty close to 100% covered for both line and branch.

• StateController.groovy (generated with grails generate-all State)
• StateControllerTests.groovy (from ${projectName}/test/integration)