Fix sometimes failing test_loadPreviousReplies_whenMessagesAreEmpty_callDelegateWithEmptyChanges

[laevandus]

🎯 Goal

Fix unstable test: test_loadPreviousReplies_whenMessagesAreEmpty_callDelegateWithEmptyChanges

🛠 Implementation

Unstable because it is checking delegate call counts, but did not properly wait for the initial background observer callback. This caused a race between initial fetch and the second load replies call. Failure was reproducible when running the unit-test locally with the repeat option.

☑️ Contributor Checklist

• [x] I have signed the Stream CLA (required)
• [ ] This change should be manually QAed
• [ ] Changelog is updated with client-facing changes
• [ ] Changelog is updated with new localization keys
• [x] New code is covered by unit tests
• [ ] Comparison screenshots added for visual changes
• [ ] Affected documentation updated (docusaurus, tutorial, CMS)

[sonarcloud[bot]]

Quality Gate passed

Issues
168 New issues
0 Accepted issues

Measures
0 Security Hotspots
83.7% Coverage on New Code
0.1% Duplication on New Code

See analysis details on SonarQube Cloud