def METHOD_NAME(self):
    self.assertIsNone(self.ctx.find_type(str(DataType.FLOAT)))
    self.assertEqual(BookForm, self.ctx.find_type("{urn:books}BookForm"))
    self.ctx.xsi_cache["{urn:books}BookForm"].append(BooksForm)
    self.assertEqual(BooksForm, self.ctx.find_type("{urn:books}BookForm"))