def METHOD_NAME(self):
    """
    _testFirstEvent_
    Verify that we set the firstEvent parameter whenever the FirstEvent
    field in the job mask is a positive integer. And the job is
    not production.
    """
    job = Job()
    job["input_files"] = [{"lfn": "bogusFile", "parents": []}]
    job["mask"] = Mask()
    tweak = PSetTweak()
    WMTweaks.makeJobTweak(job, tweak)
    self.assertFalse(hasattr(tweak.process.source, "skipEvents"),
                     "Error: There should be no skipEvents tweak.")
    self.assertFalse(hasattr(tweak.process.source, "firstEvent"),
                     "Error: There should be no firstEvent tweak.")
    job["mask"]["FirstEvent"] = 0
    tweak = PSetTweak()
    WMTweaks.makeJobTweak(job, tweak)
    self.assertTrue(hasattr(tweak.process.source, "skipEvents"),
                    "Error: There should be a skipEvents tweak.")
    self.assertEqual(tweak.process.source.skipEvents, 'customTypeCms.untracked.uint32(0)',
                     "Error: The skipEvents tweak should be 0.")
    return