Jest test crash when using cds-plugin-ui5

[js1972]

When using cds-plugin-ui5 any jest tests in my project fail with a segment fault ass below:

*[main][~/dev/consumptionopps]$ npm test     

> consumptionopps@1.0.0 test
> jest tests/test.js

  console.warn
    [cds] - WARNING: 
    
      Returning an 'activate' function is deprecated and won't be
      supported in future releases. → Please return a Promise with 'module.exports' instead.
      

      at Function.logger.warn (node_modules/@sap/cds/lib/log/cds-log.js:98:59)
      at node_modules/@sap/cds/lib/plugins.js:35:26
          at Array.map (<anonymous>)
      at Object.<anonymous>.exports.activate (node_modules/@sap/cds/lib/plugins.js:30:47)
      at cds.get plugins [as plugins] (node_modules/@sap/cds/lib/index.js:10:64)
      at Object.serve (node_modules/@sap/cds/bin/serve.js:159:13)
      at Object.exec (node_modules/@sap/cds/bin/cds-serve.js:14:17)
      at cds.exec (node_modules/@sap/cds/bin/cds-serve.js:50:47)
      at Object.<anonymous> (node_modules/@sap/cds/lib/utils/cds-test.js:57:39)

  console.debug
    [cds-ui5-plugin] [debug] activate {
      impl: '/Users/I540401/dev/consumptionopps/node_modules/cds-plugin-ui5/cds-plugin.js'
    }

      at Object.log (node_modules/cds-plugin-ui5/lib/log.js:20:16)
          at Array.map (<anonymous>)

  console.debug
    [cds-ui5-plugin] [debug] bootstrap

      at Object.log (node_modules/cds-plugin-ui5/lib/log.js:20:16)

  console.info
    [cds-ui5-plugin] [info] Mounting /fre.consumption.opportunities to UI5 app /Users/I540401/dev/consumptionopps/app/opportunities (id=opportunities)

      at Object.log (node_modules/cds-plugin-ui5/lib/log.js:20:16)


 RUNS  tests/test.js
[1]    6167 segmentation fault  npm test
*[main][~/dev/consumptionopps]$ 

If I remove the plugin, the test then work properly. Add the plugin again and they fail.

Sample repo: https://github.tools.sap/BTP-CEE/consumptionopps (branch main - Peter you have been added as a contributer).

[petermuessig]

Hmm, I think this can't be fixed easily in the cds-plugin-ui5 as the issue is related to jest and nodejs - jest forwarded the issue to node:

Jest issue (one of them): jestjs/jest#12286
Node issue: nodejs/node#35889 (fixed with Node.js >= 21)

After upgrading my local nodejs to 21 and using the following command line:

NODE_OPTIONS=--experimental-vm-modules jest tests/test.js

it works...

I have to admit, that I can't help here and this needs to be fixed using a newer Node.js version plus enabling the ESM support for JEST: https://jestjs.io/docs/ecmascript-modules

Sorry...

I think this has to be documented and therefore I'll keep it open. The try of Volker with #903 will not work... I'll close the PR and keep the issue open to add the documentation...

[petermuessig]

@petermuessig is there a way to bypass or turn off the cds plugin when running the tests maybe? If not it means the plugin is not compatible with cap testing which is a shame. Maybe via an envar?

The JEST tests are only used for the backend tests, right? In this case we may disable it exactly with the parameters @vobu used in his #903 PR to switch to require. I think this makes sense and can be done easily. WDYT? If it is only the backend tests - I'm fine and will prepare a change (and I would allow to force to enable the plugin for testing purposes with the suggestion of using Node.js 21 and the experimental support for ESM)...

[js1972]

Exactly right - the ui5 apps are not required for cds.test() etc. If there was a simple switch to completely bypass the plugin that would be perfect.

Eg. CAP_PLUGIN_BYPASS=true jest

[petermuessig]

@js1972 - ok, I would by default disable it and with force the plugin to run with CDS_PLUGIN_UI5_ACTIVE=true

I would also explain what needs to be done in the README.md of the plugin in case of using the UI5 apps for the JEST testing with the plugin.

[petermuessig]

cds-plugin-ui5 0.7.2 is about to be released