'L{isDefaultHandler} returns true if the SIGCHLD handler is SIG_DFL,
false otherwise.'

def test_isDefaultHandler(self):

    self.assertTrue(isDefaultHandler())
    signal.signal(signal.SIGCHLD, signal.SIG_IGN)
    self.assertFalse(isDefaultHandler())
    signal.signal(signal.SIGCHLD, signal.SIG_DFL)
    self.assertTrue(isDefaultHandler())
    signal.signal(signal.SIGCHLD, (lambda *args: None))
    self.assertFalse(isDefaultHandler())
