def METHOD_NAME(self):
    """The single thread test takes much longer than the multithread test but is easier to debug"""
    single_thread = False
    self.importer.generate_modules_cache(single_thread=single_thread)
    self.assertIn(("from typing import Dict", "Dict"), self.importer.search("Dict"))
    self.assertTrue(len(self.importer._dump_all()) > 0)
    for table in self.importer._dump_all():
        self.assertTrue(len(table) > 0)