End to end test example

[slinkydeveloper]

Fix restatedev/node-template-generator#18 and restatedev/sdk-typescript#101, replaces restatedev/node-template-generator#19

[gvdongen]

Looks good, will be a nice addition! I think we can make it slightly easier to be replicated by having two files for the testing logic: one to copy over with the logic of setting everything up (later to be put into an npm package), and one which just shows a single test that then uses the setup. What do you think?
Also, can we add an example for the handler API as well?

[slinkydeveloper]

Also, can we add an example for the handler API as well?

Can I do this in a followup?

[gvdongen]

Thanks for splitting up! Much nicer now.
I get the following error when running npm run test

 FAIL  test/test.ts
  ● ExampleService › works

    Error 404 during registration:

      79 |     if (!res.ok) {
      80 |       const badResponse = await res.text();
    > 81 |       throw new Error(
         |             ^
      82 |         `Error ${res.status} during registration: ${badResponse}`
      83 |       );
      84 |     }

      at prepareRestateTestContainer (test/restate_test_environment.ts:81:13)
      at Function.start (test/restate_test_environment.ts:121:35)
      at Object.<anonymous> (test/test.ts:15:30)


  ● Test suite failed to run

    TypeError: Cannot read properties of undefined (reading 'stop')

      31 |   // Stop Restate and the Service endpoint
      32 |   afterAll(async () => {
    > 33 |     await restateTestEnvironment.stop();
         |                                  ^
      34 |   });
      35 |
      36 |   it("works", async () => {

      at Object.<anonymous> (test/test.ts:33:34)

Test Suites: 1 failed, 1 total
Tests:       1 failed, 1 total
Snapshots:   0 total
Time:        3.987 s, estimated 6 s
Ran all test suites.

Jest has detected the following 1 open handle potentially keeping Jest from exiting:

  ●  TCPSERVERWRAP

      22 |   await new Promise((resolve, reject) => {
      23 |     restateHttpServer
    > 24 |       .listen(0)
         |        ^
      25 |       .once("listening", resolve)
      26 |       .once("error", reject);
      27 |   });

      at test/restate_test_environment.ts:24:8
      at prepareRestateServer (test/restate_test_environment.ts:22:9)
      at Function.start (test/restate_test_environment.ts:120:42)
      at Object.<anonymous> (test/test.ts:15:59)

[slinkydeveloper]

Error 404 during registration:

Perhaps you have an old image?

[gvdongen]

@slinkydeveloper That was indeed the issue.
Should we just for sake of documentation add this to the readme? Something like:

If you are encountering errors, try to do `docker pull docker.io/restatedev/restate:latest`.

I guess if I bump into this, I am not the only one.

[gvdongen]

LGTM!