simple integration test

api/package-lock.json

api/package.json

api/src/__mocks__/postgraphileServer.ts

api/src/app.ts

api/src/postgraphileServer.ts

api/src/queries.ts

api/src/tests/integration/app.test.ts

api/src/tests/test-helpers.ts

api/src/tests/unit/app.test.ts