'What happens if an error is raised in a DelayedCall and an error is
also raised in the test?
L{test_reporter.ErrorReportingTests.testHiddenException} checks that
both errors get reported.
Note that this behaviour is deprecated. A B{real} test would return a
Deferred that got triggered by the callLater. This would guarantee the
delayed call error gets reported.'

def testHiddenException(self):

    reactor.callLater(0, self.go)
    reactor.iterate(0.01)
    self.fail('Deliberate    failure    to    mask    the    hidden    exception')
