refine test cases for OIDC

[JacksonTian]

You need to complete

• unit tests and/or feature tests
• documentation is changed or added

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.89%. Comparing base (3bd38fa) to head (595f7a5).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #112      +/-   ##
==========================================
+ Coverage   97.20%   97.89%   +0.68%     
==========================================
  Files          32       32              
  Lines        2114     2091      -23     
==========================================
- Hits         2055     2047       -8     
+ Misses         45       31      -14     
+ Partials       14       13       -1     

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