fix(testing-library): should switch to another thread when dispatching

[upupming]

Summary

In the real Lynx App, lynx.getCoreContext and lynx.getJSContext works in the following way:

if (__BACKGROUND__) {
  lynx.getCoreContext().addEventListener("message", (e: Event) => {
    console.log('message', e)
    // {
    //   "type": "message",
    //     "data": {
    //     "type": "message",
    //       "data": [
    //         4,
    //         5,
    //         6
    //       ]
    //   },
    //   "origin": "CoreContext"
    // }
  });
  lynx.getCoreContext().postMessage({
    type: 'message',
    data: [1, 2, 3]
  });
} else {
  lynx.getJSContext().addEventListener("message", (e: Event) => {
    console.log('message', e)
  });
  // {
  //   "type": "message",
  //     "data": {
  //     "type": "message",
  //       "data": [
  //         1,
  //         2,
  //         3
  //       ]
  //   },
  //   "origin": "JSContext"
  // }
  lynx.getJSContext().postMessage({
    type: 'message',
    data: [3, 4, 5]
  });
}

We should switch to another thread when postMessage/dispatchEvent is called, this will fix the bug of thread switching when using MTS nested runOnMainThread and runOnBackground.

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[changeset-bot]

🦋 Changeset detected

Latest commit: b03f0c4

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@lynx-js/testing-environment	Patch

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...s/testing-library/testing-environment/src/index.ts	0.00%	10 Missing ⚠️

📢 Thoughts on this report? Let us know!

[codspeed-hq]

CodSpeed Performance Report

Merging #1244 will not alter performance

_{Comparing upupming:fix/testing-library-switch (b03f0c4) with main (7408d3b)}

Summary

✅ 10 untouched benchmarks

[relativeci]

Web Explorer

#2697 Bundle Size — 259.2KiB (0%).

b03f0c4(current) vs 7408d3b main#2688(baseline)

Bundle metrics  no changes

	Current #2697	Baseline #2688
Initial JS	141.05KiB	141.05KiB
Initial CSS	31.88KiB	31.88KiB
Cache Invalidation	0%	0%
Chunks	4	4
Assets	4	4
Modules	210	210
Duplicate Modules	17	17
Duplicate Code	4.15%	4.15%
Packages	4	4
Duplicate Packages	0	0

Bundle size by type  no changes

	Current #2697	Baseline #2688
JS	227.32KiB	227.32KiB
CSS	31.88KiB	31.88KiB

Bundle analysis report Branch upupming:fix/testing-library-swi... Project dashboard

---

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[relativeci]

React Example

#2706 Bundle Size — 234.12KiB (0%).

b03f0c4(current) vs 7408d3b main#2697(baseline)

Bundle metrics  no changes

	Current #2706	Baseline #2697
Initial JS	0B	0B
Initial CSS	0B	0B
Cache Invalidation	0%	0%
Chunks	0	0
Assets	4	4
Modules	153	153
Duplicate Modules	61	61
Duplicate Code	45.85%	45.85%
Packages	2	2
Duplicate Packages	0	0

Bundle size by type  no changes

	Current #2706	Baseline #2697
IMG	145.76KiB	145.76KiB
Other	88.37KiB	88.37KiB

Bundle analysis report Branch upupming:fix/testing-library-swi... Project dashboard

---

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