[test_utils] Add tests for prepend_extension
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		@@ -41,6 +41,7 @@ from youtube_dl.utils import (
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    sanitize_filename,
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    sanitize_path,
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    sanitize_url_path_consecutive_slashes,
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    prepend_extension,
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    shell_quote,
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    smuggle_url,
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    str_to_int,
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@@ -193,6 +194,14 @@ class TestUtil(unittest.TestCase):
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            sanitize_url_path_consecutive_slashes('http://hostname/abc//'),
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            'http://hostname/abc/')
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    def test_prepend_extension(self):
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        self.assertEqual(prepend_extension('abc.ext', 'temp'), 'abc.temp.ext')
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        self.assertEqual(prepend_extension('abc.ext', 'temp', 'ext'), 'abc.temp.ext')
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        self.assertEqual(prepend_extension('abc.unexpected_ext', 'temp', 'ext'), 'abc.unexpected_ext.temp')
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        self.assertEqual(prepend_extension('abc', 'temp'), 'abc.temp')
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        self.assertEqual(prepend_extension('.abc', 'temp'), '.abc.temp')
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        self.assertEqual(prepend_extension('.abc.ext', 'temp'), '.abc.temp.ext')
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    def test_ordered_set(self):
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        self.assertEqual(orderedSet([1, 1, 2, 3, 4, 4, 5, 6, 7, 3, 5]), [1, 2, 3, 4, 5, 6, 7])
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        self.assertEqual(orderedSet([]), [])
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