Move mutation testing docs from xUnit subsection to top-level Testing section

[Copilot]

Summary

Mutation testing documentation was incorrectly nested under Testing > Test frameworks > xUnit when it's a framework-agnostic testing technique. Stryker.NET works with all test frameworks—the examples simply use xUnit.

Fixes #49967

Changed navigation structure:

• From: Testing > Test frameworks > xUnit > Mutation testing
• To: Testing > Mutation testing (top-level, after "Unit test code coverage")

Modified file:

• docs/navigate/devops-testing/toc.yml - Relocated mutation testing entry

Original prompt

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This section details on the original issue you should resolve

<issue_title>Mutation testing docs are under wrong section</issue_title>
<issue_description>### Type of issue

Other (describe below)

Description

The mutation testing docs are currently in the left menu bar under section:

Testing -> Test Frameworks -> xUnit -> Mutation Testing

This is incorrect, as Mutation Testing is not a specific usecase for xUnit. It's just the case that the code examples are written with xUnit.

My suggestion would be to place this page under:

Testing -> Mutation Testing

Page URL

https://learn.microsoft.com/en-us/dotnet/core/testing/mutation-testing

Content source URL

https://github.com/dotnet/docs/blob/main/docs/core/testing/mutation-testing.md

Document Version Independent Id

189e53ea-f654-e3c4-8255-9f2044941ad0

Platform Id

0bb16469-b707-aad3-8d0e-ca513d96d384

Article author

@sigmade

Metadata

• ID: 630d3b5a-eb99-64ae-0c68-881f0d1e8ef1
• PlatformId: 0bb16469-b707-aad3-8d0e-ca513d96d384
• Service: dotnet-fundamentals

Related Issues</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Mutation testing docs are under wrong section #49106

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Internal previews

📄 File	🔗 Preview link
docs/navigate/devops-testing/toc.yml	docs/navigate/devops-testing/toc

[Copilot]

Pull Request Overview

This PR corrects the navigation structure by moving mutation testing documentation from a framework-specific location to a framework-agnostic top-level testing section. Mutation testing with Stryker.NET is applicable to all test frameworks—the documentation simply uses xUnit for its code examples.

Key changes:

• Relocated "Mutation testing" entry from nested under xUnit to top-level Testing section
• Positioned after "Unit test code coverage" for logical flow