'Calls to L{twisted.web.html} members emit a deprecation warning.'

def test_deprecation(self):

    def assertDeprecationWarningOf(method):
        '\n                                                Check    that    a    deprecation    warning    is    present.\n                                                '
        warningsShown = self.flushWarnings([self.test_deprecation])
        self.assertEqual(len(warningsShown), 1)
        self.assertIdentical(warningsShown[0]['category'], DeprecationWarning)
        self.assertEqual(warningsShown[0]['message'], ('twisted.web.html.%s    was    deprecated    in    Twisted    15.3.0;    please    use    twisted.web.template    instead' % (method,)))
    html.PRE('')
    assertDeprecationWarningOf('PRE')
    html.UL([])
    assertDeprecationWarningOf('UL')
    html.linkList([])
    assertDeprecationWarningOf('linkList')
    html.output((lambda : None))
    assertDeprecationWarningOf('output')
