class_docstr: Checks that messages, enums and files are correctly registered.
code: def testFindFileByName(self):
      self.assertEqual(
          "google/protobuf/unittest.proto",
          symbol_database.Default()
          .pool.FindFileByName("google/protobuf/unittest.proto")
          .name,
      )
  
imports: from google.protobuf.internal import test_bad_identifiers_pb2
  from google.protobuf import unittest_custom_options_pb2
  from google.protobuf import unittest_import_pb2
  from google.protobuf import unittest_import_public_pb2
  from google.protobuf import unittest_mset_pb2
  from google.protobuf import unittest_mset_wire_format_pb2
  from google.protobuf import unittest_no_generic_services_pb2
  from google.protobuf import unittest_pb2
  from google.protobuf import service
  from google.protobuf import symbol_database
label_desc: Use image node_id 3 for calling the SymbolDatabaseRegistrationTest obj's underlying member method code with example usage: obj.testFindFileByName() without return types