Copy example files and update corresponding values.
cp Makefile.env.exmaple Makefile.env
Run tests
make integration_test
Set following environment variables:
export STORAGE_GCS_INTEGRATION_TEST=on
export STORAGE_GCS_CREDENTIAL=base64:base64-content
export STORAGE_GCS_NAME=bucketname
export STORAGE_GCS_PROJECT_ID=project-id
Run tests
make integration_test