'Sanity check that file comparison is not giving false positives.'

def test_file_is_wrong(self):

    ref_fn = os.path.join(self.subdir, 'tweets.20150430-223406.retweet.csv.ref')
    with TemporaryDirectory() as tempdir:
        outfn = os.path.join(tempdir, 'tweets.20150430-223406.text.csv')
        json2csv(self.infile, outfn, ['text'], gzip_compress=False)
        self.assertFalse(are_files_identical(outfn, ref_fn), msg=self.msg)
