fix: Missing error messages in Parse errors

[mtrezza]

Issue

Flaky tests obscure real failures and erode CI reliability. Two tests were listed as flaky and retried up to 5 times on each CI run:

• ParseLiveQuery handle invalid websocket payload length — intermittent timeout
• rest query query internal field — TypeError: message.split is not a function

Approach

ParseLiveQuery test — The test sent an invalid WebSocket frame, then used setTimeout(1000) to save an object, racing against a random reconnection delay of 0–1000 ms. If the reconnect took close to 1000 ms, the save fired before the subscription was re-established, and the update event was permanently lost. Fixed by replacing the blind timeout with a deterministic event-driven flow: wait for the initial subscription open event, then listen for the close → open reconnection cycle before saving.

RestQuery test — Parse.Error was constructed with non-string messages (raw caught error objects or undefined) in DatabaseController and RestWrite. When such an error reached Jasmine's stack trace builder, message.split('\n') crashed. Fixed by ensuring all Parse.Error constructors pass a string message. The test itself also mixed expectAsync rejection checks with success queries in Promise.all; if any rejected unexpectedly, orphaned promises caused unhandled rejections. Fixed by running the two groups sequentially.

With both root causes addressed, the tests are removed from the flaky test list.

Tasks

• Add tests
• Add changes to documentation (guides, repository pages, code comments)

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[parseplatformorg]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues

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[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 92.53%. Comparing base (fe9fba6) to head (0119f25).
⚠️ Report is 3 commits behind head on alpha.

Files with missing lines	Patch %	Lines
src/RestWrite.js	83.33%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            alpha   #10304   +/-   ##
=======================================
  Coverage   92.53%   92.53%           
=======================================
  Files         192      192           
  Lines       16502    16502           
  Branches      227      227           
=======================================
  Hits        15270    15270           
  Misses       1212     1212           
  Partials       20       20           

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[parseplatformorg]

🎉 This change has been released in version 9.7.0-alpha.4