Fix Polly.Testing mutations

[martincostello]

While working on #2500 I noticed that no mutations were being tested for Polly.Testing.

This fixes that by removing the ignore-mutations setting for that project, otherwise Stryker finds no ways to mutate the code and does nothing.

Once that was fixed, some additional changes were needed to get back to 100% mutations score for that project.

[Copilot]

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (3)

test/Polly.Testing.Tests/ResiliencePipelineExtensionsTests.cs:22

• Ensure that the error message 'pipeline' is clear and helpful. Consider adding a custom message to indicate that the pipeline parameter cannot be null.

Should.Throw<ArgumentNullException>(() => pipeline.GetPipelineDescriptor()).ParamName.ShouldBe("pipeline");

test/Polly.Testing.Tests/ResiliencePipelineExtensionsTests.cs:23

• Ensure that the error message 'pipeline' is clear and helpful. Consider adding a custom message to indicate that the pipeline parameter cannot be null.

Should.Throw<ArgumentNullException>(() => pipelineGeneric.GetPipelineDescriptor()).ParamName.ShouldBe("pipeline");

src/Polly.Testing/ResiliencePipelineExtensions.cs:79

• The line components.Add(tracking); was removed. This changes the behavior of the method by not adding ExecutionTrackingComponent to the components list. If this component is expected to be part of the list, this could lead to issues.

ExpandComponents(tracking.Component, components);

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.36%. Comparing base (f58fcfb) to head (a817c7b).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2503   +/-   ##
=======================================
  Coverage   85.35%   85.36%           
=======================================
  Files         312      312           
  Lines        7465     7468    +3     
  Branches     1121     1121           
=======================================
+ Hits         6372     6375    +3     
  Misses        908      908           
  Partials      185      185           

Flag	Coverage Δ
linux	85.36% <100.00%> (+<0.01%)	⬆️
macos	85.36% <100.00%> (+<0.01%)	⬆️
windows	85.32% <100.00%> (+<0.01%)	⬆️

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