Google App Engine Manager allows customized building of app engines.

You'll need datastore emulator installed to run the integration tests. If you do not have the emulator already installed you will need to run the command:

gcloud components install cloud-datastore-emulator

To run tests you'll need to run the datastore emulator by doing the following command:

composer run datastore_emulator --timeout=0

You can now run the tests locally by using the command:

./vendor/bin/phpunit