rust-rabbit 0.3.0

# Integration Tests với RabbitMQ


> **📝 Lưu ý**: Integration tests chỉ chạy ở local, không chạy trong CI pipeline để tránh phức tạp và tốn thời gian setup RabbitMQ trên cloud.

Thư viện RustRabbit có thể viết integration test với RabbitMQ thật một cách rất hiệu quả. Dưới đây là hướng dẫn chi tiết:

## 🐳 Setup với Docker


### 1. Docker Compose cho Development


```yaml
# docker-compose.test.yml

version: '3.8'
services:
  rabbitmq:
    image: rabbitmq:3.12-management
    ports:
      - "5672:5672"
      - "15672:15672"
    environment:
      RABBITMQ_DEFAULT_USER: admin
      RABBITMQ_DEFAULT_PASS: password
      RABBITMQ_DEFAULT_VHOST: test
    volumes:
      - ./rabbitmq.conf:/etc/rabbitmq/rabbitmq.conf
      - ./enabled_plugins:/etc/rabbitmq/enabled_plugins
    healthcheck:
      test: ["CMD", "rabbitmq-diagnostics", "ping"]
      interval: 10s
      timeout: 5s
      retries: 5

  rabbitmq-delayed:
    image: rabbitmq:3.12-management
    ports:
      - "5673:5672"
      - "15673:15672"
    environment:
      RABBITMQ_DEFAULT_USER: admin
      RABBITMQ_DEFAULT_PASS: password
    volumes:
      - ./plugins:/opt/rabbitmq/plugins
    command: >
      bash -c "
        rabbitmq-plugins enable --offline rabbitmq_delayed_message_exchange &&
        rabbitmq-server
      "
    healthcheck:
      test: ["CMD", "rabbitmq-diagnostics", "ping"]
      interval: 10s
      timeout: 5s
      retries: 5
```

### 2. RabbitMQ Configuration Files


```ini
# rabbitmq.conf

loopback_users.guest = false
listeners.tcp.default = 5672
management.tcp.port = 15672
management.tcp.ip = 0.0.0.0
```

```
# enabled_plugins

[rabbitmq_management,rabbitmq_delayed_message_exchange].
```

## 🧪 Integration Test Structure


### 1. Test Utilities


```rust
// tests/common/mod.rs
use rust_rabbit::{RustRabbit, RabbitConfig};
use std::time::Duration;
use tokio::time::sleep;
use testcontainers::*;

pub struct TestEnvironment {
    pub rabbit: RustRabbit,
    pub config: RabbitConfig,
}

impl TestEnvironment {
    pub async fn new() -> anyhow::Result<Self> {
        // Wait for RabbitMQ to be ready
        wait_for_rabbitmq().await?;
        
        let config = RabbitConfig::builder()
            .connection_string("amqp://admin:password@localhost:5672/test")
            .retry(|retry| retry.max_retries(3).aggressive())
            .health(|health| health.frequent())
            .pool(|pool| pool.single_connection())
            .build();
            
        let rabbit = RustRabbit::new(config.clone()).await?;
        
        Ok(Self { rabbit, config })
    }
}

async fn wait_for_rabbitmq() -> anyhow::Result<()> {
    let max_attempts = 30;
    let mut attempts = 0;
    
    while attempts < max_attempts {
        match RustRabbit::new(
            RabbitConfig::builder()
                .connection_string("amqp://admin:password@localhost:5672/test")
                .build()
        ).await {
            Ok(_) => return Ok(()),
            Err(_) => {
                attempts += 1;
                sleep(Duration::from_secs(1)).await;
            }
        }
    }
    
    Err(anyhow::anyhow!("RabbitMQ not available after {} attempts", max_attempts))
}

pub async fn cleanup_queue(rabbit: &RustRabbit, queue_name: &str) -> anyhow::Result<()> {
    // Implementation để cleanup queue sau mỗi test
    Ok(())
}

pub fn generate_unique_queue_name(prefix: &str) -> String {
    format!("{}_{}", prefix, uuid::Uuid::new_v4())
}
```

### 2. Basic Integration Tests


```rust
// tests/integration_basic.rs
mod common;

use common::*;
use rust_rabbit::{PublishOptions, ConsumerOptions, MessageHandler, MessageResult, MessageContext};
use serde::{Serialize, Deserialize};
use std::sync::{Arc, atomic::{AtomicUsize, Ordering}};
use tokio::time::{timeout, Duration};
use async_trait::async_trait;

#[derive(Serialize, Deserialize, Debug, Clone, PartialEq)]

struct TestMessage {
    id: String,
    content: String,
    number: i32,
}

struct TestMessageHandler {
    received_count: Arc<AtomicUsize>,
    received_messages: Arc<tokio::sync::Mutex<Vec<TestMessage>>>,
}

#[async_trait]

impl MessageHandler<TestMessage> for TestMessageHandler {
    async fn handle(&self, message: TestMessage, _context: MessageContext) -> MessageResult {
        self.received_count.fetch_add(1, Ordering::SeqCst);
        
        let mut received = self.received_messages.lock().await;
        received.push(message);
        
        MessageResult::Ack
    }
}

#[tokio::test]

async fn test_basic_publish_consume() -> anyhow::Result<()> {
    let env = TestEnvironment::new().await?;
    let queue_name = generate_unique_queue_name("test_basic");
    
    // Setup publisher
    let publisher = env.rabbit.publisher();
    
    // Setup consumer
    let handler = Arc::new(TestMessageHandler {
        received_count: Arc::new(AtomicUsize::new(0)),
        received_messages: Arc::new(tokio::sync::Mutex::new(Vec::new())),
    });
    
    let consumer_options = ConsumerOptions::builder(&queue_name)
        .auto_declare_queue()
        .development()
        .build();
        
    let consumer = env.rabbit.consumer(consumer_options).await?;
    
    // Start consuming in background
    let handler_clone = handler.clone();
    let consume_task = tokio::spawn(async move {
        consumer.consume::<TestMessage, TestMessageHandler>(handler_clone).await
    });
    
    // Give consumer time to start
    tokio::time::sleep(Duration::from_millis(100)).await;
    
    // Publish test messages
    let test_messages = vec![
        TestMessage {
            id: "1".to_string(),
            content: "Hello World".to_string(),
            number: 42,
        },
        TestMessage {
            id: "2".to_string(),
            content: "Test Message".to_string(),
            number: 100,
        },
    ];
    
    let publish_options = PublishOptions::builder()
        .auto_declare_queue()
        .development()
        .build();
    
    for message in &test_messages {
        publisher.publish_to_queue(&queue_name, message, Some(publish_options.clone())).await?;
    }
    
    // Wait for messages to be processed
    let timeout_duration = Duration::from_secs(5);
    timeout(timeout_duration, async {
        loop {
            if handler.received_count.load(Ordering::SeqCst) >= test_messages.len() {
                break;
            }
            tokio::time::sleep(Duration::from_millis(10)).await;
        }
    }).await?;
    
    // Verify results
    assert_eq!(handler.received_count.load(Ordering::SeqCst), test_messages.len());
    
    let received_messages = handler.received_messages.lock().await;
    assert_eq!(received_messages.len(), test_messages.len());
    
    // Verify message content
    for expected in &test_messages {
        assert!(received_messages.iter().any(|msg| msg == expected));
    }
    
    // Cleanup
    consume_task.abort();
    cleanup_queue(&env.rabbit, &queue_name).await?;
    
    Ok(())
}

#[tokio::test]

async fn test_publish_to_exchange() -> anyhow::Result<()> {
    let env = TestEnvironment::new().await?;
    let exchange_name = "test_exchange";
    let queue_name = generate_unique_queue_name("test_exchange_queue");
    
    let publisher = env.rabbit.publisher();
    
    let test_message = TestMessage {
        id: "exchange_test".to_string(),
        content: "Exchange Message".to_string(),
        number: 200,
    };
    
    let publish_options = PublishOptions::builder()
        .auto_declare_exchange()
        .development()
        .build();
    
    publisher.publish_to_exchange(
        exchange_name,
        &queue_name,
        &test_message,
        Some(publish_options)
    ).await?;
    
    Ok(())
}
```

### 3. Retry Mechanism Tests


```rust
// tests/integration_retry.rs
mod common;

use common::*;
use rust_rabbit::{
    retry::{RetryPolicy, DelayedMessageExchange},
    connection::ConnectionManager,
    ConsumerOptions, MessageHandler, MessageResult, MessageContext
};
use serde::{Serialize, Deserialize};
use std::sync::{Arc, atomic::{AtomicUsize, Ordering}};
use tokio::time::Duration;
use async_trait::async_trait;

#[derive(Serialize, Deserialize, Debug, Clone)]

struct RetryTestMessage {
    id: String,
    should_fail: bool,
    fail_count: usize,
}

struct RetryTestHandler {
    attempt_count: Arc<AtomicUsize>,
    success_count: Arc<AtomicUsize>,
}

#[async_trait]

impl MessageHandler<RetryTestMessage> for RetryTestHandler {
    async fn handle(&self, message: RetryTestMessage, context: MessageContext) -> MessageResult {
        self.attempt_count.fetch_add(1, Ordering::SeqCst);
        
        if message.should_fail && context.retry_count < message.fail_count {
            return MessageResult::Retry;
        }
        
        self.success_count.fetch_add(1, Ordering::SeqCst);
        MessageResult::Ack
    }
}

#[tokio::test]

async fn test_delayed_message_exchange() -> anyhow::Result<()> {
    let env = TestEnvironment::new().await?;
    
    let retry_policy = RetryPolicy {
        max_retries: 3,
        initial_delay: Duration::from_millis(100),
        max_delay: Duration::from_secs(5),
        backoff_multiplier: 2.0,
        jitter: 0.0,
        ..Default::default()
    };
    
    let connection_manager = ConnectionManager::new(env.config.clone()).await?;
    let delayed_exchange = DelayedMessageExchange::new(
        connection_manager,
        "test_retry_exchange".to_string(),
        retry_policy.clone(),
    );
    
    // Setup infrastructure
    delayed_exchange.setup().await?;
    delayed_exchange.setup_retry_queues("test_retry_queue").await?;
    
    // Test message that should be retried
    let test_message = RetryTestMessage {
        id: "retry_test_1".to_string(),
        should_fail: true,
        fail_count: 2, // Fail first 2 attempts, succeed on 3rd
    };
    
    // Publish with retry
    for attempt in 0..3 {
        delayed_exchange.publish_with_retry(
            "test_retry_queue",
            &test_message,
            attempt,
            None,
        ).await?;
        
        // Small delay between retries
        tokio::time::sleep(Duration::from_millis(50)).await;
    }
    
    Ok(())
}

#[tokio::test]

async fn test_retry_policy_calculation() -> anyhow::Result<()> {
    let retry_policy = RetryPolicy {
        initial_delay: Duration::from_millis(1000),
        max_delay: Duration::from_secs(30),
        backoff_multiplier: 2.0,
        jitter: 0.0,
        ..Default::default()
    };
    
    // Test delay calculation
    assert_eq!(retry_policy.calculate_delay(0), Duration::from_millis(1000));
    assert_eq!(retry_policy.calculate_delay(1), Duration::from_millis(2000));
    assert_eq!(retry_policy.calculate_delay(2), Duration::from_millis(4000));
    
    // Test max delay cap
    let large_delay = retry_policy.calculate_delay(10);
    assert_eq!(large_delay, Duration::from_secs(30));
    
    Ok(())
}
```

### 4. Health Monitoring Tests


```rust
// tests/integration_health.rs
mod common;

use common::*;
use rust_rabbit::health::{HealthCheckConfigExt, ConnectionStatus};
use rust_rabbit::config::HealthCheckConfig;
use tokio::time::Duration;

#[tokio::test]

async fn test_health_monitoring() -> anyhow::Result<()> {
    let mut config = RabbitConfig::builder()
        .connection_string("amqp://admin:password@localhost:5672/test")
        .health(|health| health.frequent().enabled())
        .build();
    
    let rabbit = RustRabbit::new(config).await?;
    let health_checker = rabbit.health_checker();
    
    // Start monitoring
    health_checker.start_monitoring().await?;
    
    // Check initial health
    let initial_health = health_checker.check_health().await?;
    assert_eq!(initial_health.status, ConnectionStatus::Healthy);
    
    // Wait for background monitoring to run
    tokio::time::sleep(Duration::from_secs(1)).await;
    
    // Check if monitoring is working
    assert!(health_checker.is_healthy().await);
    assert!(health_checker.is_operational().await);
    
    // Get health summary
    let summary = health_checker.get_health_summary().await;
    assert!(summary.monitoring_enabled);
    assert!(summary.healthy_connections > 0);
    
    // Stop monitoring
    health_checker.stop_monitoring().await;
    
    Ok(())
}

#[tokio::test]

async fn test_wait_for_healthy() -> anyhow::Result<()> {
    let config = RabbitConfig::builder()
        .connection_string("amqp://admin:password@localhost:5672/test")
        .build();
        
    let rabbit = RustRabbit::new(config).await?;
    let health_checker = rabbit.health_checker();
    
    // Should complete quickly since connection is healthy
    health_checker.wait_for_healthy(Some(Duration::from_secs(5))).await?;
    
    Ok(())
}
```

### 5. Performance Tests


```rust
// tests/integration_performance.rs
mod common;

use common::*;
use rust_rabbit::{PublishOptions, ConsumerOptions, MessageHandler, MessageResult, MessageContext};
use serde::{Serialize, Deserialize};
use std::sync::{Arc, atomic::{AtomicUsize, Ordering}};
use tokio::time::{Duration, Instant};
use async_trait::async_trait;

#[derive(Serialize, Deserialize, Debug, Clone)]

struct PerformanceTestMessage {
    id: usize,
    payload: String,
    timestamp: u64,
}

struct PerformanceTestHandler {
    processed_count: Arc<AtomicUsize>,
}

#[async_trait]

impl MessageHandler<PerformanceTestMessage> for PerformanceTestHandler {
    async fn handle(&self, _message: PerformanceTestMessage, _context: MessageContext) -> MessageResult {
        self.processed_count.fetch_add(1, Ordering::SeqCst);
        MessageResult::Ack
    }
}

#[tokio::test]

async fn test_high_throughput_publishing() -> anyhow::Result<()> {
    let env = TestEnvironment::new().await?;
    let queue_name = generate_unique_queue_name("perf_test");
    
    let publisher = env.rabbit.publisher();
    let message_count = 1000;
    let payload = "x".repeat(1024); // 1KB payload
    
    let publish_options = PublishOptions::builder()
        .auto_declare_queue()
        .production()
        .build();
    
    let start = Instant::now();
    
    // Publish messages concurrently
    let mut tasks = Vec::new();
    for i in 0..message_count {
        let publisher = publisher.clone();
        let queue_name = queue_name.clone();
        let message = PerformanceTestMessage {
            id: i,
            payload: payload.clone(),
            timestamp: chrono::Utc::now().timestamp_millis() as u64,
        };
        let options = publish_options.clone();
        
        tasks.push(tokio::spawn(async move {
            publisher.publish_to_queue(&queue_name, &message, Some(options)).await
        }));
    }
    
    // Wait for all publishes to complete
    for task in tasks {
        task.await??;
    }
    
    let duration = start.elapsed();
    let throughput = message_count as f64 / duration.as_secs_f64();
    
    println!("Published {} messages in {:?}", message_count, duration);
    println!("Throughput: {:.2} messages/second", throughput);
    
    // Verify reasonable performance (adjust threshold as needed)
    assert!(throughput > 100.0, "Throughput too low: {:.2} msg/s", throughput);
    
    Ok(())
}

#[tokio::test]

async fn test_concurrent_consumption() -> anyhow::Result<()> {
    let env = TestEnvironment::new().await?;
    let queue_name = generate_unique_queue_name("concurrent_test");
    
    let handler = Arc::new(PerformanceTestHandler {
        processed_count: Arc::new(AtomicUsize::new(0)),
    });
    
    let consumer_options = ConsumerOptions::builder(&queue_name)
        .auto_declare_queue()
        .high_throughput() // 20 concurrent workers
        .build();
    
    let consumer = env.rabbit.consumer(consumer_options).await?;
    let handler_clone = handler.clone();
    
    // Start consumer
    let consume_task = tokio::spawn(async move {
        consumer.consume::<PerformanceTestMessage, PerformanceTestHandler>(handler_clone).await
    });
    
    // Give consumer time to start
    tokio::time::sleep(Duration::from_millis(100)).await;
    
    // Publish test messages
    let publisher = env.rabbit.publisher();
    let message_count = 100;
    
    let publish_options = PublishOptions::builder()
        .development()
        .build();
    
    for i in 0..message_count {
        let message = PerformanceTestMessage {
            id: i,
            payload: format!("Message {}", i),
            timestamp: chrono::Utc::now().timestamp_millis() as u64,
        };
        
        publisher.publish_to_queue(&queue_name, &message, Some(publish_options.clone())).await?;
    }
    
    // Wait for processing
    let timeout_duration = Duration::from_secs(10);
    tokio::time::timeout(timeout_duration, async {
        loop {
            if handler.processed_count.load(Ordering::SeqCst) >= message_count {
                break;
            }
            tokio::time::sleep(Duration::from_millis(10)).await;
        }
    }).await?;
    
    assert_eq!(handler.processed_count.load(Ordering::SeqCst), message_count);
    
    consume_task.abort();
    
    Ok(())
}
```

## 🚀 Chạy Integration Tests


### 1. Setup Environment


```bash
# Start RabbitMQ với Docker Compose

docker-compose -f docker-compose.test.yml up -d

# Chờ RabbitMQ sẵn sàng

./scripts/wait-for-rabbitmq.sh

# Chạy integration tests

cargo test --test integration_* -- --test-threads=1
```

### 2. Continuous Integration


```yaml
# .github/workflows/integration-tests.yml

name: Integration Tests

on: [push, pull_request]

jobs:
  integration-tests:
    runs-on: ubuntu-latest
    
    services:
      rabbitmq:
        image: rabbitmq:3.12-management
        ports:
          - 5672:5672
          - 15672:15672
        env:
          RABBITMQ_DEFAULT_USER: admin
          RABBITMQ_DEFAULT_PASS: password
        options: >-
          --health-cmd "rabbitmq-diagnostics ping"
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5
          
    steps:
    - uses: actions/checkout@v3
    
    - name: Install Rust
      uses: actions-rs/toolchain@v1
      with:
        toolchain: stable
        
    - name: Wait for RabbitMQ
      run: |
        timeout 60 bash -c 'until rabbitmq-diagnostics ping -q; do sleep 1; done'
        
    - name: Run integration tests
      run: |
        cargo test --test integration_* -- --test-threads=1
```

## ✅ Kết Luận


**Có thể viết integration test với RabbitMQ thật một cách rất hiệu quả:**

1. **Docker Setup**: Dễ dàng setup RabbitMQ với Docker Compose
2. **Test Isolation**: Mỗi test sử dụng queue riêng biệt
3. **Real Scenarios**: Test với RabbitMQ thật cho độ tin cậy cao
4. **Performance Testing**: Benchmark thông lượng và latency
5. **Local Development Only**: Chỉ chạy ở local, không trong CI

## 🚀 CI Pipeline Policy


**CI Pipeline chỉ chạy:**
- ✅ Unit tests (`cargo test --lib`)
- ✅ Code formatting (`cargo fmt --check`) 
- ✅ Linting (`cargo clippy`)
- ✅ Documentation build (`cargo doc`)
- ✅ Security audit (`cargo audit`)
- ✅ Example compilation (`cargo check --examples`)

**Integration tests được loại bỏ khỏi CI vì:**
- ⏱️ Tốn thời gian setup RabbitMQ trên cloud
- 🔧 Phức tạp về infrastructure requirements
- 💰 Tốn tài nguyên CI/CD
- 🏠 Tốt hơn khi test ở local với môi trường thật

**Workflow khuyến nghị:**
1. **Code changes** → Chạy unit tests trước
2. **Feature complete** → Chạy integration tests ở local  
3. **Ready to commit** → Push (CI sẽ chạy unit tests + quality checks)
4. **Pre-release** → Chạy toàn bộ integration test suite ở local

**Lợi ích của Integration Testing:**
- Phát hiện vấn đề với RabbitMQ server thật
- Test retry mechanism với delayed message exchange
- Verify connection pooling và health monitoring
- Performance benchmarking
- End-to-end workflow validation

Thư viện RustRabbit đã có đầy đủ foundation để viết integration test hiệu quả! 🎉