Fixes #1535 Tests for Post services.dart

[AyushRaghuvanshi]

What kind of change does this PR introduce?

Wrote tests for post_services.dart

Issue Number:

Fixes #1535

Did you add tests for your changes?

Yes

Summary
Added Tests for the file lib\services\post_service.dart.

Does this PR introduce a breaking change?
No

Have you read the contributing guide?
Yes

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[noman2002]

@AyushRaghuvanshi Fix the failing test.

[AyushRaghuvanshi]

@noman2002 It was not failing on my system. But the error seemed like, tests are trying to access the resource at the same time.
isar/#942 But i found this issue, which suggested to add deleteFromDisk() which i have added wherever the Hive is used.

[noman2002]

@AyushRaghuvanshi The test is failing in this PR only. It is working fine in other. Please look into it.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b548497) 76.43% compared to head (3f0073f) 76.88%.
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2103      +/-   ##
===========================================
+ Coverage    76.43%   76.88%   +0.45%     
===========================================
  Files          152      152              
  Lines         7438     7438              
===========================================
+ Hits          5685     5719      +34     
+ Misses        1753     1719      -34     

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[noman2002]

Looks good to me.