."""         self.write_dump(TestDumpImporter.DUMP)         self.write_files(TestDumpImporter.FILES)         self.assertTrue(self.do_import())          self.assertContestInDb("contestname", "contest description 你好",                                [("taskname", "task title")],                                [("username", "Last Name")])         self.assertContestInDb(             self.other_contest_name, self.other_contest_description, [], [])          self.assertFileInDb(             TestDumpImporter.GENERATED_FILE_DIGEST, "desc", b"content")         self.assertFileInDb(             TestDumpImporter.NON_GENERATED_FILE_DIGEST, "subsource", b"source")      def test_import_