Can't get parallel/threadCount to work with usetestng

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I’m having trouble triggering testng parallel test execution from within gradle. The tests just run serially, instead of parallel with 3 threads when I do this:

useTestNG{
        useDefaultListeners = true
        options {
            suites file(testXML)
            parallel = 'tests'
            threadCount = 3
            listeners.add("listeners.ScreenShotTestListener")
        }
    }

When I put parallel = ‘tests’ and thread-count = ‘3’ in the xml file, it does run in 3 threads. When I just put parallel = ‘tests’ in the xml file, it runs in the default 5 threads.

I also tried it without an xml file:

useTestNG{
        useDefaultListeners = true
        options {
            include 'tests/MyTests/develop/**'
            parallel = 'tests'
            threadCount = 3
            listeners.add("listeners.ScreenShotTestListener")
        }
    }

But again, this runs serially, instead of using 3 threads.

I’ve tried both gradle 1.11 and 2.1 testng-6.8.5.jar