Unit Testing

This document details the unit testing practices in Anya.

Test Structure

1. Test Organization

#[cfg(test)]
mod tests {
    use super::*;

    // Test setup
    fn setup() -> TestContext {
        TestContext::new()
    }

    // Test cleanup
    fn teardown(context: TestContext) {
        context.cleanup();
    }

    #[test]
    fn test_basic_functionality() {
        let context = setup();
        // Test implementation
        teardown(context);
    }
}

2. Test Categories

#[cfg(test)]
mod tests {
    // Positive tests
    #[test]
    fn test_valid_input() {
        assert!(process_input("valid").is_ok());
    }

    // Negative tests
    #[test]
    fn test_invalid_input() {
        assert!(process_input("").is_err());
    }

    // Edge cases
    #[test]
    fn test_boundary_conditions() {
        assert!(process_input("max_length").is_ok());
    }
}

3. Test Utilities

// Test helpers
pub mod test_utils {
    pub fn create_test_data() -> TestData {
        TestData::default()
    }

    pub fn verify_result(result: TestResult) -> bool {
        result.is_valid()
    }

    pub fn cleanup_test_data(data: TestData) {
        data.cleanup();
    }
}

Test Implementation

1. Basic Tests

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_addition() {
        assert_eq!(add(2, 2), 4);
    }

    #[test]
    fn test_subtraction() {
        assert_eq!(subtract(4, 2), 2);
    }

    #[test]
    fn test_multiplication() {
        assert_eq!(multiply(3, 3), 9);
    }
}

2. Property Tests

use proptest::prelude::*;

proptest! {
    #[test]
    fn test_addition_properties(a in 0..100i32, b in 0..100i32) {
        let result = add(a, b);
        prop_assert!(result >= a);
        prop_assert!(result >= b);
        prop_assert_eq!(result, b + a);
    }
}

3. Mock Tests

use mockall::automock;

#[automock]
trait Database {
    fn query(&self, id: u32) -> Result<String, Error>;
}

#[cfg(test)]
mod tests {
    #[test]
    fn test_database_query() {
        let mut mock = MockDatabase::new();
        mock.expect_query()
            .with(eq(1))
            .returning(|_| Ok("result".to_string()));

        assert_eq!(mock.query(1).unwrap(), "result");
    }
}

Best Practices

1. Test Design

  • Single responsibility
  • Clear naming
  • Comprehensive coverage
  • Independent tests

2. Test Implementation

  • Setup and teardown
  • Error handling
  • Resource cleanup
  • Documentation

3. Test Maintenance

  • Regular updates
  • Coverage monitoring
  • Performance checks
  • Documentation updates