Duplicate test.done() breaks nodeunit internals

[TWiStErRob]

test.js (there's no smaller repro than this!):

exports.duplicateDoneBreaksNodeUnit = function(test) {
    test.done();
    test.done();
};

output:

�[1m�[32mOK: �[39m�[22m0 assertions (105ms)

...\project\node_modules\nodeunit\lib\core.js:284
    if (group.setUp) {
             ^
TypeError: Cannot read property 'setUp' of undefined
    at wrapGroup (...\project\node_modules\nodeunit\lib\core.js:284:14)
    at Object.exports.runSuite (...\project\node_modules\nodeunit\lib\core.js:92:13)
    at exports.runSuite (...\project\node_modules\nodeunit\lib\core.js:124:21)
    at _concat (...\project\node_modules\nodeunit\deps\async.js:513:13)
    at async.forEachSeries.iterate (...\project\node_modules\nodeunit\deps\async.js:123:13)
    at async.forEachSeries.iterate (...\project\node_modules\nodeunit\deps\async.js:134:25)
    at _concat (...\project\node_modules\nodeunit\deps\async.js:515:17)
    at exports.test.test.done (...\project\node_modules\nodeunit\lib\types.js:146:17)
    at process.startup.processNextTick.process._tickCallback (node.js:244:9)

[luanmuniz]

👍 Same here

[jkingsbery]

Agreed. It would be nice if nodeunit provided an error message saying that test.done was invoked multiple times or something like that. I started looking around for a setUp function and couldn't find any, it's a very misleading error message.