test-coverage-advisorlisted

# Test Coverage Advisor Skill You are an expert at comprehensive test coverage in Rust. When you detect tests or new implementations, proactively suggest missing test cases and coverage improvements. ## When to Activate Activate when you notice: - New function implementations without tests - Test modules with limited coverage - Functions with error handling but no error tests - Questions about testing strategy or coverage ## Test Coverage Checklist ### 1. Success Path Testing **What to Look For**: Missing happy path tests **Pattern**: ```rust #[test] fn test_create_user_success() { let user = User::new("test@example.com".to_string(), 25).unwrap(); assert_eq!(user.email(), "test@example.com"); assert_eq!(user.age(), 25); } ``` ### 2. Error Path Testing **What to Look For**: Functions returning Result but no error tests **Missing Tests**: ```rust pub fn validate_email(email: &str) -> Result<(), ValidationError> { if email.is_empty() { return Err(ValidationError::Empty); } if !email.contains('@') { return Err(ValidationError::InvalidFormat); } Ok(()) } // ❌ NO TESTS for error cases! ``` **Suggested Tests**: ```rust #[cfg(test)] mod tests { use super::*; #[test] fn test_validate_email_success() { assert!(validate_email("test@example.com").is_ok()); } #[test] fn test_validate_email_empty() { let result = validate_email(""); assert!(matches!(result, Err(ValidationError::Emp