If you'd like to see what data are stored in the localhost Datastore emulator, install Datastore Viewer:
pip install datastore-viewer
Then you can run the Datastore Viewer using this command (note that Datastore emulator needs to be running!):
# mac & linux:
export DATASTORE_EMULATOR_HOST=localhost:8001 && datastore-viewer
# windows
set DATASTORE_EMULATOR_HOST=localhost:8001 && datastore-viewer
Datastore Viewer will run on http://127.0.0.1:8082/. Enter test
as the project name and
you'll see the data in your Datastore.