def testExtendStringWithString(self, message_module):
    """Test extending repeated string fields with characters from a string."""
    m = message_module.TestAllTypes()
    self.assertSequenceEqual([], m.repeated_string)
    m.repeated_string.extend('abc')
    self.assertSequenceEqual(['a', 'b', 'c'], m.repeated_string)
Test extending repeated string fields with characters from a string.
deps/protobuf/python/google/protobuf/internal/message_test.py