Fix flaky internal integration test

[helto4real]

Breaking change

Proposed change

Fix the flaky test by adding a delay to the test before sending event after subscribing to the event.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the [development checklist][dev-checklist]
• The code compiles without warnings (code quality chek)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (c44b02e) 79.44% compared to head (97159fd) 79.53%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #946      +/-   ##
==========================================
+ Coverage   79.44%   79.53%   +0.08%     
==========================================
  Files         175      175              
  Lines        3469     3469              
  Branches      449      449              
==========================================
+ Hits         2756     2759       +3     
+ Misses        529      527       -2     
+ Partials      184      183       -1     

Flag	Coverage Δ
unittests	79.53% <ø> (+0.08%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

see 2 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.