Improve unit test coverage in Polly.Specs

[gintsk]

Pull Request

The issue or feature being addressed

Contributes to #1290

Details on the issue fix or feature implementation

Adding some more tests to improve coverage regarding changes in #1957

Confirm the following

• I started this PR by branching from the head of the default branch
• I have targeted the PR to merge into the default branch
• I have included unit tests for the issue/feature
• I have successfully run a local build

[gintsk]

Added some more tests to get past 75% line coverage threshold.
For these tests I had to include parameters signature in test method name.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a6b9b33) 83.23% compared to head (9e07c23) 83.64%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1974      +/-   ##
==========================================
+ Coverage   83.23%   83.64%   +0.40%     
==========================================
  Files         312      312              
  Lines        7106     7106              
  Branches     1056     1056              
==========================================
+ Hits         5915     5944      +29     
+ Misses        806      789      -17     
+ Partials      385      373      -12     

Flag	Coverage Δ
linux	83.64% <ø> (+0.40%)	⬆️
macos	83.64% <ø> (+0.40%)	⬆️
windows	83.64% <ø> (+0.40%)	⬆️

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[martintmk]

Thanks @gintsk !