Test for join_organisation_after_auth.dart

[Dante291]

What kind of change does this PR introduce?

test for join org.

Issue Number:

Fixes #2152

Did you add tests for your changes?

yes

Have you read the contributing guide?

yes

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (06fdb92) 87.38% compared to head (c15da25) 87.65%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2260      +/-   ##
===========================================
+ Coverage    87.38%   87.65%   +0.27%     
===========================================
  Files          155      155              
  Lines         7356     7356              
===========================================
+ Hits          6428     6448      +20     
+ Misses         928      908      -20     

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[noman2002]

Looks good.