The tests expect a running instance of PubSub. You can run the emulator specified in the docker-compose.yml, then set the correct env variable by running the following:
make up
PUBSUB_EMULATOR_HOST=localhost:8085 make test
Running one test:
make up
PUBSUB_EMULATOR_HOST=localhost:8085 go test -v ./... -run TestPublishSubscribe/TestContinueAfterSubscribeClose