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Leonardo Maldonado 0016d5cfb2 Add comprehensive Rust best practices skill with 179 rules

Includes rules for:
- Ownership and borrowing patterns
- Error handling with thiserror/anyhow
- Memory management and allocation
- API design following Rust guidelines
- Async/Tokio patterns
- Performance optimization
- Naming conventions
- Type safety
- Testing strategies
- Documentation standards
- Project structure
- Linting configuration
- Common anti-patterns to avoid

2026-01-19 10:23:19 -03:00

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test-descriptive-names

Use descriptive test names that explain what is being tested

Why It Matters

Test names appear in test output and serve as documentation. A good test name tells you what behavior is being verified without reading the test body. When a test fails, a descriptive name immediately tells you what broke.

Bad

#[test]
fn test1() { ... }

#[test]
fn test_parse() { ... }  // Parse what? What behavior?

#[test]
fn it_works() { ... }

#[test]
fn test_function() { ... }

// Failure output: "test test_parse ... FAILED"
// What failed? No idea.

Good

#[test]
fn parse_returns_error_for_empty_input() { ... }

#[test]
fn parse_handles_unicode_characters() { ... }

#[test]
fn user_creation_requires_valid_email() { ... }

#[test]
fn expired_token_is_rejected() { ... }

// Failure output: "test parse_returns_error_for_empty_input ... FAILED"
// Immediately know what broke!

Naming Patterns

// Pattern: function_condition_expected_result
#[test]
fn parse_valid_json_returns_document() { ... }

#[test]
fn parse_invalid_json_returns_syntax_error() { ... }

// Pattern: scenario_expectation
#[test]
fn empty_cart_has_zero_total() { ... }

#[test]
fn adding_item_increases_cart_total() { ... }

// Pattern: when_given_then (BDD-style)
#[test]
fn when_user_not_found_then_returns_404() { ... }

Edge Cases

#[test]
fn handles_empty_string() { ... }

#[test]
fn handles_max_length_input() { ... }

#[test]
fn handles_unicode_emoji() { ... }

#[test]
fn handles_null_bytes() { ... }

#[test]
fn handles_concurrent_access() { ... }

Error Cases

#[test]
fn rejects_negative_quantity() { ... }

#[test]
fn returns_error_for_invalid_email_format() { ... }

#[test]
fn panics_on_double_initialization() { ... }

#[test]
fn timeout_returns_timeout_error() { ... }

Module Organization

#[cfg(test)]
mod tests {
    use super::*;
    
    mod parsing {
        use super::*;
        
        #[test]
        fn accepts_valid_json() { ... }
        
        #[test]
        fn rejects_trailing_comma() { ... }
    }
    
    mod validation {
        use super::*;
        
        #[test]
        fn requires_name_field() { ... }
        
        #[test]
        fn email_must_contain_at_symbol() { ... }
    }
}

// Test output:
// tests::parsing::accepts_valid_json
// tests::parsing::rejects_trailing_comma
// tests::validation::requires_name_field

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