feat: migrate NSubstitute setup calls and Arg matchers

[vbreuss]

This pull request significantly enhances the NSubstitute-to-Mockolate migration code fix provider by adding support for rewriting NSubstitute setup/configuration calls and their argument matchers, along with comprehensive tests for these scenarios. The changes introduce logic to identify and transform NSubstitute's setup methods (like Returns, Throws, etc.) and argument matchers (like Arg.Any, Arg.Is) into their Mockolate equivalents.

The most important changes include:

Core migration logic improvements

• Added logic to identify NSubstitute setup/configurator methods (e.g., Returns, Throws) and rewrite them to Mockolate's Mock.Setup pattern in NSubstituteCodeFixProvider. This includes handling both method and property setups.
• Implemented transformation of NSubstitute argument matchers (Arg.Any, Arg.Is, etc.) to the corresponding Mockolate It matchers (It.IsAny, It.Is, It.Satisfies). This ensures argument matching semantics are preserved during migration.

Test coverage

• Added a new test class SetupTests in NSubstituteCodeFixProviderTests to verify the correct rewriting of various NSubstitute setup patterns and argument matchers to Mockolate equivalents. These tests cover method setups, property setups, exception setups, and multiple argument matchers.
• Refactored the test class structure to allow for partial class extension, enabling separation of creation and setup tests.

Code quality and maintainability

• Disabled specific code analysis warnings to allow for higher cognitive complexity and string literal duplication in the analyzer code, acknowledging the complexity inherent in code transformation logic.
• Added necessary using directives for collections to support new logic.

[github-actions]

Test Results

  3 files  ± 0    3 suites  ±0   2m 9s ⏱️ +12s
101 tests + 8  101 ✅ + 8  0 💤 ±0  0 ❌ ±0 
303 runs  +24  303 ✅ +24  0 💤 ±0  0 ❌ ±0 

Results for commit c72ae76. ± Comparison against base commit 5c98b8a.

♻️ This comment has been updated with latest results.

[Copilot]

Pull request overview

Adds NSubstitute setup/matcher migration behavior to the NSubstitute code fix, along with new tests verifying the rewritten setup calls and translated Arg.* matchers.

Changes:

• Extend NSubstituteCodeFixProvider to also rewrite NSubstitute setup/configuration call receivers to .<mock>.Mock.Setup.<member>(...) and translate Arg.Any / Arg.Is to It.*.
• Add a new SetupTests test suite covering method/property setup rewrites and matcher translations.
• Convert NSubstituteCodeFixProviderTests to a partial class to split test suites across files.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
Tests/Mockolate.Migration.Tests/NSubstituteCodeFixProviderTests.SetupTests.cs	New tests validating setup/matcher rewrites for NSubstitute migrations.
Tests/Mockolate.Migration.Tests/NSubstituteCodeFixProviderTests.CreationTests.cs	Make test container class partial to share across new test file.
Source/Mockolate.Migration.Analyzers.CodeFixers/NSubstituteCodeFixProvider.cs	Implement setup receiver rewriting and Arg.* matcher translation during creation-call migration.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
82.8% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

This is addressed in release v0.5.0.