fix(tests): stabilize plugin and doctor tests for Docker/act (#238)

[qhkm]

Summary

• Skip test_execute_binary_not_executable when running as root (UID 0) — root bypasses file execute permission checks on Linux, causing the test to pass when it should fail
• Broaden spawn-failure error assertions in test_execute_spawn_failure and test_chat_spawn_failure to accept OS-level error text alongside our wrapped message
• Use longer random binary name in test_check_binary_missing to avoid PATH collisions in unusual environments
• Add Debug derive to DiagItem for better assertion messages

Root Cause Analysis

Test	Root Cause
test_execute_binary_not_executable	Docker runs as root → root ignores execute permission bits
test_execute_spawn_failure	Error message format may differ across Docker/act environments
test_chat_spawn_failure	Same as above
test_check_binary_missing	Defensive fix — longer name prevents collisions

Test plan

• All 4 affected tests pass locally
• Full cargo test --lib passes (2918 tests)
• cargo clippy -- -D warnings clean
• cargo fmt -- --check clean

Closes #238

🤖 Generated with Claude Code

Summary by CodeRabbit

• Tests

  • Improved test reliability across different runtime environments, including containerized and CI setups.
  • Enhanced error handling to be platform-agnostic across diagnostic and plugin tooling tests.
  • Strengthened test stability in restricted runtime contexts.

• Refactor

  • Added enhanced debugging support to diagnostic tools.

[coderabbitai]

📝 Walkthrough

Walkthrough

Three files updated to stabilize tests across local and Docker/Act environments. Changes include adding Debug derive to DiagItem, accepting flexible error messages in spawn failure assertions, and adding root-aware test guards to skip permission-related tests when running as root.

Changes

Cohort / File(s)	Summary
Test Error Message Flexibility src/providers/plugin.rs, src/tools/binary_plugin.rs	Modified test_chat_spawn_failure and test_execute_spawn_failure to accept either "Failed to spawn" or "No such file" error messages, accommodating OS-level variations across environments.
Root-Aware Test Guards src/tools/binary_plugin.rs	Added Unix-only is_root() helper and skip guard in test_execute_binary_not_executable to prevent false negatives when tests run as root in Docker-like environments.
DiagItem Debug Derive & Test Name Uniqueness src/cli/doctor.rs	Added #[derive(Debug)] to public DiagItem struct and updated test_check_binary_missing to use a random-looking binary name for reduced collision risk.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 Tests now wiggle-hop with grace,
Root checks and messages embrace,
Docker, Act, and local too,
All environments work through!
Derive and guards now save the day,
Unstable tests skip away! 🎉

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'fix(tests): stabilize plugin and doctor tests for Docker/act' accurately describes the main objective of the PR—fixing environment-specific test failures in Docker/act environments.
Linked Issues check	✅ Passed	All changes directly address the failing tests identified in issue #238: skip root execution permission test, broaden error assertions for environment differences, extend binary name to prevent collisions, and add Debug derive to improve diagnostics.
Out of Scope Changes check	✅ Passed	All changes are directly scoped to stabilizing the four failing tests: test_execute_binary_not_executable, test_execute_spawn_failure, test_chat_spawn_failure, and test_check_binary_missing. No unrelated modifications are present.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/docker-test-mismatch

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[coderabbitai]

🧹 Nitpick comments (1)

src/tools/binary_plugin.rs (1)

282-294: LGTM!

The is_root() helper is well-implemented with proper error handling. The docstring clearly explains why this check is needed for Docker environments.

💡 Optional: Consider using libc::getuid() for a lighter-weight check

The current implementation spawns a process, which is fine for test code. If you ever want to avoid the process spawn overhead, you could use:

#[cfg(unix)]
fn is_root() -> bool {
    // SAFETY: getuid() is always safe to call
    unsafe { libc::getuid() == 0 }
}

This is purely optional since the current implementation is correct and clear.

🤖 Prompt for AI Agents

Verify each finding against the current code and only fix it if needed.

In `@src/tools/binary_plugin.rs` around lines 282 - 294, Replace the current
process-spawn implementation of is_root() with a direct UID check to avoid
overhead: update the #[cfg(unix)] fn is_root() to call libc::getuid() (unsafe
block) and return true when it equals 0, keeping the docstring and cfg intact;
this changes the check from using std::process::Command::new("id") to using
unsafe { libc::getuid() == 0 } while preserving behavior and error handling.

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Nitpick comments:
In `@src/tools/binary_plugin.rs`:
- Around line 282-294: Replace the current process-spawn implementation of
is_root() with a direct UID check to avoid overhead: update the #[cfg(unix)] fn
is_root() to call libc::getuid() (unsafe block) and return true when it equals
0, keeping the docstring and cfg intact; this changes the check from using
std::process::Command::new("id") to using unsafe { libc::getuid() == 0 } while
preserving behavior and error handling.

---

ℹ️ Review info

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 3884e12c-3650-49e8-b2ee-42d5f9f2fa8c

📥 Commits

Reviewing files that changed from the base of the PR and between e782488 and 234f855.

📒 Files selected for processing (3)

• src/cli/doctor.rs
• src/providers/plugin.rs
• src/tools/binary_plugin.rs