Using SAP CAP typescript ApplicationService in Jest on cds 7

[jorgegrau]

Hi everyone!

First of all, I appreciate your time reading this.

We have a Typescript CAP project working fine since a lot of time (CDS 5) and since we upgrade to CDS 7 we're having problems on Jest testing. Basically our ApplicationService isn't loading on Jest testing and then non of our Handlers is loaded making all our test fail.

Making some changes to our code we see that if we change our XXService.ts to XXXService.js all work fine like before. As comment before, if we run it with CDS 6 all works fine.

Our current version of CDS is 7.3 and also try it with CDS 7.4 with the same result.

Have been change anything on CDS 7 and Jest? Is there anything we can do?

Thanks and regards,

Edit: Adding an extra information for more detail:

srv/service/TestService.cds

service TestService { function hello(to : String) returns String;};

srv/service/TestService.ts

import cds from '@sap/cds';
export class TestService extends cds.ApplicationService {
async init() { console.log("Hello world!"); await super.init(); }}
module.exports.TestService = TestService;

srv/server.ts

import cds from '@sap/cds';import helmet from 'helmet';import { Application } from 'express';
cds.on('bootstrap', (app: Application) => { app.use(helmet());});
module.exports = (o): Function => { return cds.server(o);};

srv/index.cds

using from './services/TestService';

jest.config.ts

import type { Config } from 'jest';
export default async (): Promise<Config> => { return { preset: 'ts-jest', testEnvironment: 'node', transform: { '\\.js?$': 'babel-jest', '\\.ts$': 'ts-jest', }, testMatch: ['**/*.test.ts'], verbose: false, roots: ['test'], maxWorkers: 1, logHeapUsage: true, setupFilesAfterEnv: ['./jest.setup.ts'], globalSetup: './jest.global.setup.ts', };};

jest.global.setup.ts

import cds from '@sap/cds';
export default async (): Promise<void> => { console.log("I'll be called first before any test cases run"); // load Axios const service = cds.test(__dirname); await service; globalThis.__service__ = service; globalThis.__cds__ = cds; console.log('end global setup');};

npm run test console oput:

> captest@1.0.0 test<br>> jest<br>Determining test suites to run...I'll be called first before any test cases run<br>[cds] - loaded model from 4 file(s):<br>  srv/index.cds<br>  srv/services/TestService.cds<br>  db/TestModel.cds<br>  node_modules/@sap/cds/common.cds<br>[cds] - connect to db > sqlite { url: 'db.sqlite' }<br>[cds] - using authentication: { kind: 'mocked' } <br>[auth] - WARNING: <br>    Usage of 'ID' in user configurations is deprecated and won't be<br>    supported in future releases. → Please use property 'id' instead.<br>  <br>[cds] - serving TestService { path: '/odata/v4/test' }<br>[cds] - server listening on { url: 'http://localhost:54878' }<br>[cds] - launched at 1/15/2024, 1:22:14 PM, version: 7.3.0, in: 307.46ms<br>[cds] - [ terminate with ^C ]<br>end global setup<br> PASS  test/Example.test.ts (261 MB heap size)<br>[odata] - GET /odata/v4/test/$metadata <br>Test Suites: 1 passed, 1 total<br>Tests:       1 passed, 1 total<br>Snapshots:   0 total<br>Time:        0.115 s, estimated 1 s<br>Ran all test suites.

We can see that Hello World isn't logged on console. Now change our handler to js:

TestService.js

const cds = require('@sap/cds');
module.exports = () => { console.log("Hello world!");}

If we re-run our tests:

npm run test<br>> captest@1.0.0 test<br>> jest<br>Determining test suites to run...I'll be called first before any test cases run<br>[cds] - loaded model from 4 file(s):<br>  srv/index.cds<br>  srv/services/TestService.cds<br>  db/TestModel.cds<br>  node_modules/@sap/cds/common.cds<br>[cds] - connect to db > sqlite { url: 'db.sqlite' }<br><strong>Hello world!<br></strong>[cds] - using authentication: { kind: 'mocked' } <br>[auth] - WARNING: <br>    Usage of 'ID' in user configurations is deprecated and won't be<br>    supported in future releases. → Please use property 'id' instead.<br>  <br>[cds] - serving TestService { path: '/odata/v4/test', impl: 'srv/services/TestService.js' }<br>[cds] - server listening on { url: 'http://localhost:54907' }<br>[cds] - launched at 1/15/2024, 1:24:47 PM, version: 7.3.0, in: 328.202ms<br>[cds] - [ terminate with ^C ]<br>end global setup<br> PASS  test/Example.test.ts (262 MB heap size)<br>[odata] - GET /odata/v4/test/$metadata <br>Test Suites: 1 passed, 1 total<br>Tests:       1 passed, 1 total<br>Snapshots:   0 total<br>Time:        0.108 s, estimated 1 s<br>Ran all test suites.

As you can see now we have the "Hello World!" output on console because the Handler has been loaded.

[Willem_Pardaens]

Have you consulted the release documentation with the (breaking) changes from CDS 6 to CDS 7? See https://cap.cloud.sap/docs/releases/jun23

Are you able to provide more concrete error information or logs that display the error?

[jorgegrau]

Hi willem.pardaens,

We revised all the documentation and don't saw anything and we cannot show an error because it doesn't return an error, it doesn't load de Handler configuration.

For more detail, I edit the post with all the detail to reproduce it.

Thank you very much and regars,