✅ improve unit test setup

[BenoitZugmeyer]

Motivation

For a long time, our unit test suite did not support to be built as a single bundle -- each .spec.ts files produced a separate bundle with their dependencies, so module-level variables were not shared between spec files.

This constraint caused maintenance issues in the past (see). It also prevents us from running global cleanups in the "forEach.spec.ts" file.

Changes

• Make sure all tests are properly cleaned-up on exit
• Remove the runtimeChunck: false option so karma-webpack is building mutualizing common dependencies between spec files
• Also, introduce a --seed argument so we can run the spec files for a given seed without modifying the config file (useful for letting agents investigating test failures)

Test instructions

If CI is green, it should be good

Checklist

• Tested locally
• Tested on staging
• Added unit tests for this change.
• Added e2e/integration tests for this change.
• Updated documentation and/or relevant AGENTS.md file

[datadog-datadog-prod-us1]

⚠️ Tests

✨ Fix all issues with Cursor

⚠️ Warnings

🧪 1 Test failed

makeRecorderApi recorder boot with automatic start starts recording when init() is called from Safari 12.1.2 (Mac OS 10.14.6) (Datadog) (Fix with Cursor)

Expected $.length = 2 to equal 1.
Expected $[0].metrics.result = 'aborted' to equal 'succeeded'.
<Jasmine>
webpack:///packages/rum/src/boot/recorderApi.spec.ts:91:52 <- /tmp/_karma_webpack_495919/commons.js:100432:60
asyncFunctionResume@[native code]
[native code]
promiseReactionJob@[native code]

ℹ️ Info

❄️ No new flaky tests detected

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 02c399c | Docs | Datadog PR Page | Was this helpful? Give us feedback!}

[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	168.98 KiB	168.97 KiB	-3 B	-0.00%	✅
Rum Profiler	4.31 KiB	4.31 KiB	0 B	0.00%	✅
Rum Recorder	24.54 KiB	24.54 KiB	0 B	0.00%	✅
Logs	56.27 KiB	56.27 KiB	-3 B	-0.01%	✅
Flagging	944 B	944 B	0 B	0.00%	✅
Rum Slim	125.82 KiB	125.82 KiB	-3 B	-0.00%	✅
Worker	23.63 KiB	23.63 KiB	0 B	0.00%	✅

🚀 CPU Performance

Pending...

🧠 Memory Performance

Pending...

🔗 RealWorld