chore: Improve null check, test typing, and IDE settings

[HofmeisterAn]

What does this PR do?

Converts the auth-provider theory data to typed TheoryData<T1, T2> to resolve xUnit analyzer findings, and removes null-forgiving (!) operators across src/ and tests/ since nullable
reference types aren't enabled and they were no-ops kept only to silence ReSharper. The two related inspections are now SUGGESTION.

Why is it important?

-

Related issues

-

Summary by CodeRabbit

• Code Quality

  • Improved nullability annotations and removed unnecessary null-suppression usage without changing runtime behavior.

• Tests

  • Strengthened test data typing and streamlined test code while maintaining existing coverage and behavior.

• Developer Experience

  • Updated spell-checking terms and IDE inspection settings for more consistent development workflows.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Team

Run ID: c9c480d3-aea4-4eab-bcfd-f8b9a438d086

📥 Commits

Reviewing files that changed from the base of the PR and between 6581499 and df94d90.

📒 Files selected for processing (11)

• Testcontainers.dic
• Testcontainers.sln.DotSettings
• src/Testcontainers/Clients/TestcontainersClient.cs
• src/Testcontainers/Containers/DockerContainer.cs
• tests/Testcontainers.AspireDashboard.Tests/AspireDashboardContainerTest.cs
• tests/Testcontainers.Databases.Tests/DatabasesContainerTest.cs
• tests/Testcontainers.LowkeyVault.Tests/LowkeyVaultContainerTest.cs
• tests/Testcontainers.Platform.Linux.Tests/TarOutputMemoryStreamTest.cs
• tests/Testcontainers.Playwright.Tests/PlaywrightContainerTest.cs
• tests/Testcontainers.Tests/Unit/Builders/CommonDirectoryPathTest.cs
• tests/Testcontainers.Tests/Unit/Configurations/DockerEndpointAuthenticationProviderTest.cs

🚧 Files skipped from review as they are similar to previous changes (11)

• src/Testcontainers/Containers/DockerContainer.cs
• Testcontainers.dic
• tests/Testcontainers.LowkeyVault.Tests/LowkeyVaultContainerTest.cs
• tests/Testcontainers.Tests/Unit/Builders/CommonDirectoryPathTest.cs
• Testcontainers.sln.DotSettings
• tests/Testcontainers.AspireDashboard.Tests/AspireDashboardContainerTest.cs
• tests/Testcontainers.Tests/Unit/Configurations/DockerEndpointAuthenticationProviderTest.cs
• src/Testcontainers/Clients/TestcontainersClient.cs
• tests/Testcontainers.Databases.Tests/DatabasesContainerTest.cs
• tests/Testcontainers.Playwright.Tests/PlaywrightContainerTest.cs
• tests/Testcontainers.Platform.Linux.Tests/TarOutputMemoryStreamTest.cs

Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review.

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Walkthrough

The change updates spell-check and inspection settings, removes redundant null-forgiving operators from production and test code, and converts authentication test data to strongly typed TheoryData collections.

Changes

Nullability and test quality

Layer / File(s)	Summary
Dictionary and inspection settings Testcontainers.dic, Testcontainers.sln.DotSettings	Adds dictionary entries and updates nullable inspection severity settings.
Production nullability annotations src/Testcontainers/Clients/TestcontainersClient.cs, src/Testcontainers/Containers/DockerContainer.cs	Removes redundant null-forgiving operators without changing runtime behavior.
Test nullability cleanup tests/Testcontainers.*.Tests/*, tests/Testcontainers.Tests/Unit/Builders/CommonDirectoryPathTest.cs	Removes redundant null-forgiving operators from test code.
Strongly typed authentication test data tests/Testcontainers.Tests/Unit/Configurations/DockerEndpointAuthenticationProviderTest.cs	Replaces List<object[]> collections with typed TheoryData collections and direct typed arguments.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to df94d

This change strengthens authentication test-data typing and removes redundant null-forgiving operators without an identified current-head production risk.

Poem

A rabbit reads each line,
The patch grows clear beneath the moon,
Small changes hop in place,
Tests guard the garden path,
Reviews bloom before the dawn.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 16.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 9 files. (2 skipped: …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
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.
Title check	✅ Passed	The title clearly summarizes the main changes: null-forgiving operator cleanup, typed test data, and IDE settings updates.
Description check	✅ Passed	The description explains the main changes and their purpose. The mandatory rationale section contains only a placeholder, and no testing steps are provided, but the description is otherwise relevant a…

Full details: Docstring Coverage

Explanation

Docstring coverage is 16.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 12 functions across 9 files. (2 skipped: 2 unsupported.)

• Fix all pre-merge checks with AI

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/use-theory-data-in-endpoint-authentication-tests

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