test: expand test coverage for config validators and robust edge cases

[Tei1988]

Thoroughly expanded unit test suite with high-value coverage for config validators (ValidateWorkdir, ValidatePort, ValidateGroupAdd, and ValidateToolName) without modifying any production code. All tests run and pass perfectly.

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PR created automatically by Jules for task 3603892501454412509 started by @Tei1988

Summary by CodeRabbit

• Tests
  • Added expanded edge-case validation coverage for working directories, including empty and absolute path handling.
  • Added additional robustness tests for port mappings, group additions, and tool names, covering invalid formats, unsupported protocols, out-of-range values, unsafe names, and illegal/traversal characters.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 1275b0d2-9799-4675-b712-b42b3024ba1f

📥 Commits

Reviewing files that changed from the base of the PR and between a40ee0f and 507cd89.

📒 Files selected for processing (1)

• internal/config/test_improvement_extra_scenarios_test.go

🚧 Files skipped from review as they are similar to previous changes (1)

• internal/config/test_improvement_extra_scenarios_test.go

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📝 Walkthrough

Walkthrough

Adds configuration validation unit tests covering workdir edge cases and robustness checks for port, group-add, and tool-name validators.

Changes

Configuration validation tests

Layer / File(s)	Summary
Workdir validation cases internal/config/test_improvement_extra_scenarios_test.go	Adds table-driven assertions for accepted empty and absolute paths, plus rejected relative, traversal, illegal-character, and backslash inputs.
Validator robustness cases internal/config/test_improvement_extra_scenarios_test.go	Adds subtests covering valid and malformed port mappings, group-add values, and tool names.

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

Possibly related PRs

• Tei1988/cderun#508: Adds overlapping robustness coverage for the same configuration validators.
• Tei1988/cderun#416: Extends configuration validation tests for the same validator functions.
• Tei1988/cderun#386: Adds overlapping edge-case coverage for port validation.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description summarizes the change, but it omits the required template sections for概要,関連タスク, andチェックリスト.	Rewrite the PR description to follow the repository template and include the required sections, especially the checklist and related task info.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: expanded config validator test coverage for edge cases.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

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[Tei1988]

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@internal/config/test_improvement_extra_scenarios_test.go`:
- Around line 337-339: Replace the error assertions with require.Error in
internal/config/test_improvement_extra_scenarios_test.go at lines 337-339,
351-352, 362-364, and 366-367, covering invalid protocol/port, invalid
group-add, empty or dot tool names, and path-like tool names; reuse the existing
require import.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

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• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 89126de7-6677-422a-8d04-89cdb4dfbcc1

📥 Commits

Reviewing files that changed from the base of the PR and between 0e3f355 and a40ee0f.

📒 Files selected for processing (1)

• internal/config/test_improvement_extra_scenarios_test.go

[Tei1988]

@coderabbitai review

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✅ Action performed

Review finished.

Note: CodeRabbit is an incremental review system and does not re-review already reviewed commits. This command is applicable only when automatic reviews are paused.