Typescript function app tests using supertest

[pjanuario]

I was trying to figure way to generate a test to hit a function app using jest and supertest libraries, any hint on how this could be performed? I didn't found any documentation from it. The only solution i found is to test the handler directly not being able to test the actual "mount" of the function.

[ejizba]

If you want the actual mount, you'd have to run Azure Functions Core Tools in a child process. We do this for our own end-to-end tests here if you want a quick example

[pjanuario]

Thanks, @ejizba I ended up in writting unit tests and call the function app handler, the only thing I wasn't able to test is the handler registration, for some reason I wasn't being able to mock the app.get.

handler.ts

app.get("function-app", {
  authLevel: "function",
  handler: Handler,
});

Any ideas on how this could be tested without having the need to mount core tools? Also noticed an annoying error while running tests.

  console.warn
    WARNING: Skipping call to register function "function-app" because the "@azure/functions" package is in test mode.

      79 | }
      80 |
    > 81 | app.get("function-app", {
         |     ^
      82 |   authLevel: "function",
      83 |   handler: Handler,
      84 | });

      at generic (node_modules/@azure/functions/dist/webpack:/@azure/functions/src/app.ts:143:17)
      at http (node_modules/@azure/functions/dist/webpack:/@azure/functions/src/app.ts:92:5)
      at Object.get (node_modules/@azure/functions/dist/webpack:/@azure/functions/src/app.ts:71:5)
      at Object.<anonymous> (src/functions/Handler.ts:81:5)
      at Object.<anonymous> (src/functions/Handler.test.ts:1:1)

[ejizba]

Unfortunately the app.get functionality relies on core tools, which is also why you're getting that warning. There's no real way to workaround that

[pjanuario]

Thanks for the feedback, I will close this. I have to say that v4 version interface is closer from node/express experience, the thing I miss most is indeed techniques and documentation to use the tools we often use while developing on node express ecosystem.