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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

from twisted.trial import unittest
from twisted.web import html



class WebHtmlTests(unittest.TestCase):
    """
    Unit tests for L{twisted.web.html}.
    """

    def test_deprecation(self):
        """
        Calls to L{twisted.web.html} members emit a deprecation warning.
        """
        def assertDeprecationWarningOf(method):
            """
            Check that a deprecation warning is present.
            """
            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')