Running specific tags in data-driven QML test doesn't work

import QtTest 1.11

TestCase {
  name: 'Test'

  function test_some_data() { 
    return [ { tag: 'foo' }, { tag: 'bar' }, { tag: 'baz' } ]
  }

  function test_some(data) {
    compare(3, data.tag.length)
  }
}