Add functional coverage for generated registrations

[dukesteen]

Exercise service lifetimes, registration and duplicate strategies, keyed and factory services, open generics, tags, proxy identity, and RegisterServices callbacks against a real service provider.

Summary by CodeRabbit

• Tests
  • Added functional coverage for duplicate registration strategies: append, skip, and replace.
  • Added validation for keyed service resolution and tag-based filtering.
  • Added coverage for singleton, scoped, and transient lifetimes.
  • Added tests for factory registrations, open generics, manual registrations, and registration strategies.
• Chores
  • Removed an obsolete placeholder test.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: a9276fd8-da83-46ee-9b9f-37754b4921c8

📥 Commits

Reviewing files that changed from the base of the PR and between 7b240ee and abd3a89.

📒 Files selected for processing (10)

• tests/Immediate.Injections.FunctionalTests/DuplicateStrategies/DuplicateStrategyTests.cs
• tests/Immediate.Injections.FunctionalTests/Empty.cs
• tests/Immediate.Injections.FunctionalTests/Factories/FactoryTests.cs
• tests/Immediate.Injections.FunctionalTests/KeyedServices/KeyedServiceTests.cs
• tests/Immediate.Injections.FunctionalTests/Lifetimes/LifetimeTests.cs
• tests/Immediate.Injections.FunctionalTests/OpenGenerics/OpenGenericTests.cs
• tests/Immediate.Injections.FunctionalTests/RegisterServices/RegisterServicesTests.cs
• tests/Immediate.Injections.FunctionalTests/RegistrationStrategies/RegistrationStrategyTests.cs
• tests/Immediate.Injections.FunctionalTests/ServiceProviderFactory.cs
• tests/Immediate.Injections.FunctionalTests/Tags/TagTests.cs

💤 Files with no reviewable changes (1)

• tests/Immediate.Injections.FunctionalTests/Empty.cs

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📝 Walkthrough

Walkthrough

Adds functional DI tests for registration strategies, duplicate handling, factories, keys, tags, lifetimes, open generics, and manual registrations. Introduces a shared validated service-provider factory and removes the placeholder empty test.

Changes

Functional DI tests

Layer / File(s)	Summary
Service-provider test harness tests/Immediate.Injections.FunctionalTests/ServiceProviderFactory.cs	Adds shared provider construction with optional service configuration, generated test-service registration, and validation options.
Registration behavior coverage tests/Immediate.Injections.FunctionalTests/RegistrationStrategies/RegistrationStrategyTests.cs, tests/Immediate.Injections.FunctionalTests/DuplicateStrategies/DuplicateStrategyTests.cs, tests/Immediate.Injections.FunctionalTests/Tags/TagTests.cs, tests/Immediate.Injections.FunctionalTests/KeyedServices/KeyedServiceTests.cs	Tests interface registration strategies, duplicate append/skip/replace behavior, tag filtering, and matching keyed resolution.
Factory and manual registration coverage tests/Immediate.Injections.FunctionalTests/Factories/FactoryTests.cs, tests/Immediate.Injections.FunctionalTests/RegisterServices/RegisterServicesTests.cs	Tests factory-created services, dependency and key propagation, manual registration methods, and tag forwarding.
Resolution lifetime and generic coverage tests/Immediate.Injections.FunctionalTests/Lifetimes/LifetimeTests.cs, tests/Immediate.Injections.FunctionalTests/OpenGenerics/OpenGenericTests.cs	Tests singleton, scoped, and transient instance behavior plus closed resolutions from open-generic registrations.

Estimated code review effort: 3 (Moderate) | ~25 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: adding functional test coverage for generated registrations.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test/add-injections-functional-tests

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