def testPackageInitializationImport(self):
    """Test that we can import nested messages from their __init__.py.

    Such setup is not trivial since at the time of processing of __init__.py one
    can't refer to its submodules by name in code, so expressions like
    google.protobuf.internal.import_test_package.inner_pb2
    don't work. They do work in imports, so we have assign an alias at import
    and then use that alias in generated code.
    """
    # We import here since it's the import that used to fail, and we want
    # the failure to have the right context.
    # pylint: disable=g-import-not-at-top
    from google.protobuf.internal import import_test_package
    # pylint: enable=g-import-not-at-top
    msg = import_test_package.myproto.Outer()
    # Just check the default value.
    self.assertEqual(57, msg.inner.value)
Test that we can import nested messages from their __init__.py.

    Such setup is not trivial since at the time of processing of __init__.py one
    can't refer to its submodules by name in code, so expressions like
    google.protobuf.internal.import_test_package.inner_pb2
    don't work. They do work in imports, so we have assign an alias at import
    and then use that alias in generated code.
    
deps/protobuf/python/google/protobuf/internal/reflection_test.py