Testing Framework in TuskLang for Rust

The testing framework in TuskLang for Rust provides comprehensive testing capabilities that integrate seamlessly with Rust's built-in testing ecosystem, offering powerful assertions, mocking, property-based testing, and performance benchmarking.

Basic Testing Structure

// Basic test module
#[cfg(test)]
mod tests {
    use super::*;
    use tusk_testing::*;
    #[test]
    fn test_basic_functionality() {
        let result = @calculator.add(2, 3);
        assert_eq!(result, 5);
    }
    #[tokio::test]
    async fn test_async_functionality() {
        let user = @user_service.find_user(1).await.unwrap();
        assert!(user.is_some());
        assert_eq!(user.unwrap().name, "John Doe");
    }
    #[test]
    fn test_with_tusk_operators() {
        let config = @config.load("test_config.tsk");
        let db_url = @env.get("TEST_DATABASE_URL", "sqlite::memory:");
        
        assert_eq!(config.get("app_name"), "TestApp");
        assert!(!db_url.is_empty());
    }
}

Test Configuration and Setup

// Test configuration with TuskLang
pub struct TestConfig {
    pub database_url: String,
    pub api_base_url: String,
    pub test_data_path: String,
}
impl TestConfig {
    pub fn from_tusk_config() -> Result<Self, Box<dyn std::error::Error + Send + Sync>> {
        let config = @config.load("test_config.tsk");
        
        Ok(TestConfig {
            database_url: @env.get("TEST_DATABASE_URL", "sqlite::memory:"),
            api_base_url: config.get("api.base_url", "http://localhost:8080"),
            test_data_path: config.get("test.data_path", "./test_data"),
        })
    }
    
    pub fn setup_test_environment(&self) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        // Setup test database
        @db.connect(&self.database_url)?;
        @db.migrate()?;
        
        // Load test data
        let test_data = @file.read(&self.test_data_path)?;
        @db.seed(&test_data)?;
        
        // Setup test API server
        @api.start(&self.api_base_url)?;
        
        Ok(())
    }
    
    pub fn cleanup_test_environment(&self) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        @db.cleanup()?;
        @api.stop()?;
        Ok(())
    }
}
// Test fixtures
pub struct TestFixture {
    config: TestConfig,
    test_data: serde_json::Value,
}
impl TestFixture {
    pub async fn new() -> Result<Self, Box<dyn std::error::Error + Send + Sync>> {
        let config = TestConfig::from_tusk_config()?;
        config.setup_test_environment()?;
        
        let test_data = @file.read_json(&format!("{}/fixtures.json", config.test_data_path))?;
        
        Ok(Self { config, test_data })
    }
    
    pub fn get_test_user(&self) -> User {
        serde_json::from_value(self.test_data["users"]["test_user"].clone()).unwrap()
    }
    
    pub fn get_test_product(&self) -> Product {
        serde_json::from_value(self.test_data["products"]["test_product"].clone()).unwrap()
    }
}
impl Drop for TestFixture {
    fn drop(&mut self) {
        if let Err(e) = self.config.cleanup_test_environment() {
            eprintln!("Failed to cleanup test environment: {}", e);
        }
    }
}

Advanced Assertions

// Custom assertion macros for TuskLang
#[macro_export]
macro_rules! assert_tusk_config {
    ($config:expr, $key:expr, $expected:expr) => {
        let actual = $config.get($key);
        assert_eq!(actual, $expected, "Config key '{}' mismatch", $key);
    };
}
#[macro_export]
macro_rules! assert_database_record {
    ($table:expr, $conditions:expr, $expected_count:expr) => {
        let count = @db.table($table).where_conditions($conditions).count();
        assert_eq!(count, $expected_count, "Database record count mismatch for table '{}'", $table);
    };
}
#[macro_export]
macro_rules! assert_api_response {
    ($response:expr, $status:expr, $expected_data:expr) => {
        assert_eq!($response.status(), $status);
        let response_data: serde_json::Value = $response.json().await.unwrap();
        assert_eq!(response_data, $expected_data);
    };
}
// Usage in tests
#[test]
fn test_config_assertions() {
    let config = @config.load("test_config.tsk");
    
    assert_tusk_config!(config, "app.name", "TestApp");
    assert_tusk_config!(config, "database.type", "sqlite");
}
#[tokio::test]
async fn test_database_assertions() {
    let fixture = TestFixture::new().await.unwrap();
    let user = fixture.get_test_user();
    
    @db.users.insert(&user).await.unwrap();
    
    assert_database_record!("users", &[("email", &user.email)], 1);
}
#[tokio::test]
async fn test_api_assertions() {
    let client = reqwest::Client::new();
    let response = client.get("http://localhost:8080/api/health").send().await.unwrap();
    
    assert_api_response!(response, 200, serde_json::json!({
        "status": "healthy",
        "timestamp": @date.now()
    }));
}

Mocking and Stubbing

// Mock framework for TuskLang
pub trait Mockable {
    fn mock(&self) -> Mock;
}
pub struct Mock {
    expectations: std::collections::HashMap<String, MockExpectation>,
}
pub struct MockExpectation {
    pub return_value: Option<serde_json::Value>,
    pub error: Option<String>,
    pub call_count: usize,
    pub expected_calls: usize,
}
impl Mock {
    pub fn new() -> Self {
        Self {
            expectations: std::collections::HashMap::new(),
        }
    }
    
    pub fn expect_call(&mut self, method: &str, return_value: serde_json::Value) -> &mut Self {
        self.expectations.insert(method.to_string(), MockExpectation {
            return_value: Some(return_value),
            error: None,
            call_count: 0,
            expected_calls: 1,
        });
        self
    }
    
    pub fn expect_error(&mut self, method: &str, error: String) -> &mut Self {
        self.expectations.insert(method.to_string(), MockExpectation {
            return_value: None,
            error: Some(error),
            call_count: 0,
            expected_calls: 1,
        });
        self
    }
    
    pub fn times(&mut self, method: &str, count: usize) -> &mut Self {
        if let Some(expectation) = self.expectations.get_mut(method) {
            expectation.expected_calls = count;
        }
        self
    }
    
    pub fn verify(&self) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        for (method, expectation) in &self.expectations {
            if expectation.call_count != expectation.expected_calls {
                return Err(format!("Method '{}' called {} times, expected {}", 
                                 method, expectation.call_count, expectation.expected_calls).into());
            }
        }
        Ok(())
    }
}
// Mock database
pub struct MockDatabase {
    mock: Mock,
}
impl MockDatabase {
    pub fn new() -> Self {
        Self { mock: Mock::new() }
    }
    
    pub fn expect_find_user(&mut self, user_id: u32, user: User) -> &mut Self {
        self.mock.expect_call("find_user", serde_json::to_value(user).unwrap());
        self
    }
    
    pub fn expect_find_user_error(&mut self, user_id: u32, error: String) -> &mut Self {
        self.mock.expect_error("find_user", error);
        self
    }
}
impl Database for MockDatabase {
    async fn find_user(&self, user_id: u32) -> Result<Option<User>, Box<dyn std::error::Error + Send + Sync>> {
        let expectation = self.mock.expectations.get_mut("find_user")
            .ok_or("No expectation set for find_user")?;
        
        expectation.call_count += 1;
        
        if let Some(error) = &expectation.error {
            return Err(error.clone().into());
        }
        
        if let Some(value) = &expectation.return_value {
            let user: User = serde_json::from_value(value.clone())?;
            Ok(Some(user))
        } else {
            Ok(None)
        }
    }
}
// Usage in tests
#[tokio::test]
async fn test_with_mocks() {
    let mut mock_db = MockDatabase::new();
    let test_user = User::new(1, "Test User".to_string(), "test@example.com".to_string());
    
    mock_db.expect_find_user(1, test_user.clone());
    
    let user_service = UserService::new(Box::new(mock_db));
    let result = user_service.get_user(1).await.unwrap();
    
    assert_eq!(result.unwrap().name, "Test User");
    mock_db.mock.verify().unwrap();
}

Property-Based Testing

// Property-based testing with proptest
use proptest::prelude::*;
proptest! {
    #[test]
    fn test_user_creation_properties(user_id in 1..1000u32, name in ".", email in ".@.*") {
        let user = User::new(user_id, name.clone(), email.clone());
        
        // Property 1: User ID should be preserved
        assert_eq!(user.id, user_id);
        
        // Property 2: Name should be preserved
        assert_eq!(user.name, name);
        
        // Property 3: Email should be preserved
        assert_eq!(user.email, email);
        
        // Property 4: User should be valid
        assert!(user.is_valid());
    }
    
    #[test]
    fn test_config_parsing_properties(config_str in r#"[a-zA-Z_][a-zA-Z0-9_]\s=\s*[a-zA-Z0-9_]+"#) {
        let config = @config.parse(&config_str);
        
        // Property 1: Config should be valid
        assert!(config.is_ok());
        
        // Property 2: Config should contain the parsed key-value pair
        let config = config.unwrap();
        assert!(!config.is_empty());
    }
    
    #[test]
    fn test_database_query_properties(query in r#"SELECT\s+[a-zA-Z_][a-zA-Z0-9_]\s+FROM\s+[a-zA-Z_][a-zA-Z0-9_]"#) {
        let result = @db.execute(&query);
        
        // Property 1: Query should execute without syntax errors
        assert!(result.is_ok() || result.unwrap_err().to_string().contains("table"));
    }
}
// Custom strategies for TuskLang types
prop_compose! {
    fn valid_tusk_config()(keys in prop::collection::vec("[a-zA-Z_][a-zA-Z0-9_]*", 1..10)) -> String {
        keys.into_iter()
            .map(|key| format!("{} = {}", key, generate_random_value()))
            .collect::<Vec<_>>()
            .join("\n")
    }
}
fn generate_random_value() -> String {
    use rand::Rng;
    let mut rng = rand::thread_rng();
    
    match rng.gen_range(0..4) {
        0 => format!("\"{}\"", rng.gen::<u32>()),
        1 => rng.gen::<u32>().to_string(),
        2 => if rng.gen() { "true" } else { "false" }.to_string(),
        _ => format!("@env.get(\"{}\")", rng.gen::<u32>()),
    }
}
proptest! {
    #[test]
    fn test_tusk_config_properties(config_str in valid_tusk_config()) {
        let config = @config.parse(&config_str);
        
        // Property 1: Valid TuskLang config should parse successfully
        assert!(config.is_ok());
        
        // Property 2: Parsed config should contain all keys
        let config = config.unwrap();
        let lines: Vec<_> = config_str.lines().collect();
        for line in lines {
            if let Some((key, _)) = line.split_once('=') {
                let key = key.trim();
                assert!(config.has_key(key));
            }
        }
    }
}

Integration Testing

// Integration test framework
pub struct IntegrationTestFramework {
    test_server: TestServer,
    test_database: TestDatabase,
    test_cache: TestCache,
}
impl IntegrationTestFramework {
    pub async fn new() -> Result<Self, Box<dyn std::error::Error + Send + Sync>> {
        let config = @config.load("integration_test_config.tsk");
        
        let test_database = TestDatabase::new(&config.get("database.url")).await?;
        let test_cache = TestCache::new(&config.get("cache.url")).await?;
        let test_server = TestServer::new(&config.get("server.port")).await?;
        
        Ok(Self {
            test_server,
            test_database,
            test_cache,
        })
    }
    
    pub async fn setup_test_data(&self, test_data: &str) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        let data = @file.read_json(test_data)?;
        
        // Setup database
        for (table, records) in data.as_object().unwrap() {
            for record in records.as_array().unwrap() {
                @db.table(table).insert(record).await?;
            }
        }
        
        // Setup cache
        if let Some(cache_data) = data.get("cache") {
            for (key, value) in cache_data.as_object().unwrap() {
                @cache.set(key, value, 3600).await?;
            }
        }
        
        Ok(())
    }
    
    pub async fn cleanup_test_data(&self) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
        @db.cleanup_all().await?;
        @cache.clear().await?;
        Ok(())
    }
    
    pub async fn make_request(&self, method: &str, path: &str, body: Option<serde_json::Value>) 
        -> Result<reqwest::Response, Box<dyn std::error::Error + Send + Sync>> {
        
        let client = reqwest::Client::new();
        let url = format!("http://localhost:{}{}", self.test_server.port(), path);
        
        let request = match method.to_uppercase().as_str() {
            "GET" => client.get(&url),
            "POST" => {
                let mut req = client.post(&url);
                if let Some(body_data) = body {
                    req = req.json(&body_data);
                }
                req
            }
            "PUT" => {
                let mut req = client.put(&url);
                if let Some(body_data) = body {
                    req = req.json(&body_data);
                }
                req
            }
            "DELETE" => client.delete(&url),
            _ => return Err("Unsupported HTTP method".into()),
        };
        
        Ok(request.send().await?)
    }
}
// Integration test example
#[tokio::test]
async fn test_user_api_integration() {
    let framework = IntegrationTestFramework::new().await.unwrap();
    
    // Setup test data
    framework.setup_test_data("test_data/users.json").await.unwrap();
    
    // Test user creation
    let new_user = serde_json::json!({
        "name": "Integration Test User",
        "email": "integration@test.com"
    });
    
    let response = framework.make_request("POST", "/api/users", Some(new_user)).await.unwrap();
    assert_eq!(response.status(), 201);
    
    let created_user: User = response.json().await.unwrap();
    assert_eq!(created_user.name, "Integration Test User");
    
    // Test user retrieval
    let response = framework.make_request("GET", &format!("/api/users/{}", created_user.id), None).await.unwrap();
    assert_eq!(response.status(), 200);
    
    let retrieved_user: User = response.json().await.unwrap();
    assert_eq!(retrieved_user.id, created_user.id);
    
    // Cleanup
    framework.cleanup_test_data().await.unwrap();
}

Performance Testing

// Performance testing framework
pub struct PerformanceTestFramework {
    metrics: std::sync::Arc<tokio::sync::Mutex<Vec<PerformanceMetric>>>,
}
#[derive(Clone)]
pub struct PerformanceMetric {
    pub test_name: String,
    pub duration: std::time::Duration,
    pub memory_usage: usize,
    pub cpu_usage: f64,
}
impl PerformanceTestFramework {
    pub fn new() -> Self {
        Self {
            metrics: std::sync::Arc::new(tokio::sync::Mutex::new(Vec::new())),
        }
    }
    
    pub async fn benchmark<F, T>(&self, test_name: &str, iterations: usize, test_fn: F) -> PerformanceMetric
    where
        F: Fn() -> T + Send + Sync,
        T: Send + Sync,
    {
        let start_time = std::time::Instant::now();
        let start_memory = @memory.get_usage();
        let start_cpu = @cpu.get_usage();
        
        for _ in 0..iterations {
            test_fn();
        }
        
        let duration = start_time.elapsed();
        let end_memory = @memory.get_usage();
        let end_cpu = @cpu.get_usage();
        
        let metric = PerformanceMetric {
            test_name: test_name.to_string(),
            duration,
            memory_usage: end_memory - start_memory,
            cpu_usage: end_cpu - start_cpu,
        };
        
        self.metrics.lock().await.push(metric.clone());
        metric
    }
    
    pub async fn benchmark_async<F, T>(&self, test_name: &str, iterations: usize, test_fn: F) -> PerformanceMetric
    where
        F: Fn() -> std::pin::Pin<Box<dyn std::future::Future<Output = T> + Send>> + Send + Sync,
        T: Send + Sync,
    {
        let start_time = std::time::Instant::now();
        let start_memory = @memory.get_usage();
        let start_cpu = @cpu.get_usage();
        
        let mut futures = Vec::new();
        for _ in 0..iterations {
            futures.push(test_fn());
        }
        
        futures::future::join_all(futures).await;
        
        let duration = start_time.elapsed();
        let end_memory = @memory.get_usage();
        let end_cpu = @cpu.get_usage();
        
        let metric = PerformanceMetric {
            test_name: test_name.to_string(),
            duration,
            memory_usage: end_memory - start_memory,
            cpu_usage: end_cpu - start_cpu,
        };
        
        self.metrics.lock().await.push(metric.clone());
        metric
    }
    
    pub async fn generate_report(&self) -> String {
        let metrics = self.metrics.lock().await;
        
        let mut report = String::from("Performance Test Report\n");
        report.push_str("=====================\n\n");
        
        for metric in metrics.iter() {
            report.push_str(&format!("Test: {}\n", metric.test_name));
            report.push_str(&format!("  Duration: {:?}\n", metric.duration));
            report.push_str(&format!("  Memory Usage: {} bytes\n", metric.memory_usage));
            report.push_str(&format!("  CPU Usage: {:.2}%\n", metric.cpu_usage));
            report.push_str("\n");
        }
        
        report
    }
}
// Performance test example
#[tokio::test]
async fn test_database_performance() {
    let framework = PerformanceTestFramework::new();
    
    // Benchmark database operations
    let metric = framework.benchmark_async("database_insert", 1000, || {
        Box::pin(async {
            let user = User::new(1, "Test User".to_string(), "test@example.com".to_string());
            @db.users.insert(&user).await.unwrap();
        })
    }).await;
    
    // Assert performance requirements
    assert!(metric.duration.as_millis() < 5000, "Database insert took too long: {:?}", metric.duration);
    assert!(metric.memory_usage < 10  1024  1024, "Memory usage too high: {} bytes", metric.memory_usage);
    
    // Generate and save report
    let report = framework.generate_report().await;
    @file.write("performance_report.txt", &report).unwrap();
}

Test Data Generation

// Test data generator
pub struct TestDataGenerator {
    faker: Faker,
}
impl TestDataGenerator {
    pub fn new() -> Self {
        Self { faker: Faker::new() }
    }
    
    pub fn generate_user(&self) -> User {
        User::new(
            self.faker.number().between(1, 10000),
            self.faker.name().name(),
            self.faker.internet().email(),
        )
    }
    
    pub fn generate_product(&self) -> Product {
        Product::new(
            self.faker.number().between(1, 10000),
            self.faker.commerce().product_name(),
            self.faker.commerce().price(),
            self.faker.commerce().category(),
        )
    }
    
    pub fn generate_tusk_config(&self) -> String {
        format!(
            r#"
app_name = "{}"
database_url = "{}"
api_key = "@env.get('API_KEY')"
debug_mode = {}
max_connections = {}
"#,
            self.faker.company().name(),
            self.faker.internet().url(),
            self.faker.random().boolean(),
            self.faker.number().between(10, 100)
        )
    }
    
    pub fn generate_test_data_file(&self, count: usize) -> String {
        let mut data = serde_json::Map::new();
        
        let users: Vec<_> = (0..count).map(|_| {
            serde_json::to_value(self.generate_user()).unwrap()
        }).collect();
        
        let products: Vec<_> = (0..count).map(|_| {
            serde_json::to_value(self.generate_product()).unwrap()
        }).collect();
        
        data.insert("users".to_string(), serde_json::Value::Array(users));
        data.insert("products".to_string(), serde_json::Value::Array(products));
        
        serde_json::to_string_pretty(&serde_json::Value::Object(data)).unwrap()
    }
}
// Usage in tests
#[test]
fn test_with_generated_data() {
    let generator = TestDataGenerator::new();
    
    // Generate test users
    let users: Vec<_> = (0..10).map(|_| generator.generate_user()).collect();
    
    for user in users {
        assert!(user.is_valid());
        assert!(!user.name.is_empty());
        assert!(user.email.contains('@'));
    }
    
    // Generate TuskLang config
    let config_str = generator.generate_tusk_config();
    let config = @config.parse(&config_str);
    assert!(config.is_ok());
}

Test Coverage and Reporting

// Test coverage framework
pub struct TestCoverageFramework {
    coverage_data: std::sync::Arc<tokio::sync::Mutex<CoverageData>>,
}
#[derive(Default)]
pub struct CoverageData {
    pub functions_called: std::collections::HashSet<String>,
    pub branches_taken: std::collections::HashSet<String>,
    pub lines_executed: std::collections::HashSet<u32>,
}
impl TestCoverageFramework {
    pub fn new() -> Self {
        Self {
            coverage_data: std::sync::Arc::new(tokio::sync::Mutex::new(CoverageData::default())),
        }
    }
    
    pub async fn record_function_call(&self, function_name: &str) {
        self.coverage_data.lock().await.functions_called.insert(function_name.to_string());
    }
    
    pub async fn record_branch_taken(&self, branch_id: &str) {
        self.coverage_data.lock().await.branches_taken.insert(branch_id.to_string());
    }
    
    pub async fn record_line_executed(&self, line_number: u32) {
        self.coverage_data.lock().await.lines_executed.insert(line_number);
    }
    
    pub async fn generate_coverage_report(&self, source_files: &[String]) -> String {
        let coverage_data = self.coverage_data.lock().await;
        
        let mut report = String::from("Test Coverage Report\n");
        report.push_str("===================\n\n");
        
        report.push_str(&format!("Functions Called: {}\n", coverage_data.functions_called.len()));
        report.push_str(&format!("Branches Taken: {}\n", coverage_data.branches_taken.len()));
        report.push_str(&format!("Lines Executed: {}\n", coverage_data.lines_executed.len()));
        
        report.push_str("\nCovered Functions:\n");
        for function in &coverage_data.functions_called {
            report.push_str(&format!("  - {}\n", function));
        }
        
        report
    }
}
// Coverage test example
#[test]
fn test_with_coverage() {
    let coverage = TestCoverageFramework::new();
    
    // Test function with coverage recording
    let result = {
        coverage.record_function_call("calculate_total");
        coverage.record_line_executed(10);
        
        let items = vec![1, 2, 3, 4, 5];
        let total: i32 = items.iter().sum();
        
        coverage.record_line_executed(11);
        total
    };
    
    assert_eq!(result, 15);
    
    // Generate coverage report
    let report = coverage.generate_coverage_report(&["src/calculator.rs".to_string()]);
    @file.write("coverage_report.txt", &report).unwrap();
}

This comprehensive guide covers Rust-specific testing patterns, ensuring type safety, performance, and integration with Rust's testing ecosystem while maintaining the power and flexibility of TuskLang's testing capabilities.