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unicode_sample = u'\uc77c\uc601'
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valid_utf8_str = unicode_sample.encode('utf-8')
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invalid_utf8_str = unicode_sample.encode('utf-8')[::-1]
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for false_argument in [None,
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self.assertFalse(constraints.check_utf8(false_argument))
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for true_argument in ['this is ascii and utf-8, too',