# 🧪 **apt-ostree Testing Strategy**

## 🎯 **Overview**

This document outlines the comprehensive testing strategy for apt-ostree, covering unit testing, integration testing, system testing, and CI/CD integration. The testing approach ensures reliability, compatibility with rpm-ostree, and production readiness.

## 🏗️ **Testing Architecture**

### **Testing Pyramid**
```
                    /\
                   /  \     E2E Tests (Few, Slow)
                  /____\    
                 /      \   Integration Tests (Some, Medium)
                /________\  
               /          \ Unit Tests (Many, Fast)
              /____________\
```

### **Test Categories**
- **Unit Tests** - Individual component testing
- **Integration Tests** - Component interaction testing
- **System Tests** - End-to-end system testing
- **Performance Tests** - Performance and scalability testing
- **Security Tests** - Security and authorization testing

## 🔧 **Unit Testing Strategy**

### **Core Components to Test**

#### **CLI Commands**
```rust
// src/commands/status.rs
#[cfg(test)]
mod tests {
    use super::*;
    use crate::test_utils::*;

    #[tokio::test]
    async fn test_status_command_basic() {
        let mut cmd = StatusCommand::new();
        let args = vec!["status".to_string()];
        
        let result = cmd.execute(&args).await;
        assert!(result.is_ok());
    }

    #[tokio::test]
    async fn test_status_command_with_os() {
        let mut cmd = StatusCommand::new();
        let args = vec!["status".to_string(), "--os".to_string(), "debian".to_string()];
        
        let result = cmd.execute(&args).await;
        assert!(result.is_ok());
    }

    #[tokio::test]
    async fn test_status_command_json_output() {
        let mut cmd = StatusCommand::new();
        let args = vec!["status".to_string(), "--json".to_string()];
        
        let result = cmd.execute(&args).await;
        assert!(result.is_ok());
    }
}
```

#### **Package Management**
```rust
// src/package/package_manager.rs
#[cfg(test)]
mod tests {
    use super::*;
    use crate::test_utils::*;

    #[test]
    fn test_package_info_parsing() {
        let dpkg_output = "Package: vim\nVersion: 2:9.0.1378-1\nDepends: libc6";
        let package_info = parse_dpkg_output(dpkg_output).unwrap();
        
        assert_eq!(package_info.name, "vim");
        assert_eq!(package_info.version, "2:9.0.1378-1");
        assert!(package_info.depends.contains(&"libc6".to_string()));
    }

    #[test]
    fn test_dependency_resolution() {
        let mut manager = PackageManager::new();
        let deps = vec!["vim".to_string(), "emacs".to_string()];
        
        let resolved = manager.resolve_dependencies(&deps).unwrap();
        assert!(!resolved.is_empty());
    }
}
```

#### **OSTree Integration**
```rust
// src/ostree/ostree_manager.rs
#[cfg(test)]
mod tests {
    use super::*;
    use crate::test_utils::*;

    #[tokio::test]
    async fn test_deployment_listing() {
        let manager = OstreeManager::new();
        let deployments = manager.list_deployments().await.unwrap();
        
        assert!(!deployments.is_empty());
    }

    #[tokio::test]
    async fn test_system_info_gathering() {
        let manager = OstreeManager::new();
        let info = manager.get_system_info().await.unwrap();
        
        assert!(!info.os.is_empty());
        assert!(!info.kernel.is_empty());
        assert!(!info.architecture.is_empty());
    }
}
```

### **Test Utilities and Mocking**

#### **Test Utilities**
```rust
// src/test_utils/mod.rs
use std::path::PathBuf;
use tempfile::TempDir;

pub struct TestEnvironment {
    pub temp_dir: TempDir,
    pub ostree_repo: PathBuf,
    pub apt_cache: PathBuf,
}

impl TestEnvironment {
    pub fn new() -> Result<Self, Box<dyn std::error::Error>> {
        let temp_dir = tempfile::tempdir()?;
        let ostree_repo = temp_dir.path().join("ostree");
        let apt_cache = temp_dir.path().join("apt");
        
        // Initialize test environment
        std::fs::create_dir_all(&ostree_repo)?;
        std::fs::create_dir_all(&apt_cache)?;
        
        Ok(Self {
            temp_dir,
            ostree_repo,
            apt_cache,
        })
    }

    pub fn create_mock_package(&self, name: &str, version: &str) -> Result<(), Box<dyn std::error::Error>> {
        let package_dir = self.apt_cache.join(format!("{}_{}", name, version));
        std::fs::create_dir_all(&package_dir)?;
        
        // Create mock package files
        std::fs::write(package_dir.join("control"), format!("Package: {}\nVersion: {}", name, version))?;
        
        Ok(())
    }
}

impl Drop for TestEnvironment {
    fn drop(&mut self) {
        // Cleanup happens automatically with TempDir
    }
}
```

#### **Mock Services**
```rust
// src/test_utils/mock_services.rs
use async_trait::async_trait;
use crate::daemon::DaemonService;

pub struct MockDaemonService {
    pub should_fail: bool,
    pub mock_responses: std::collections::HashMap<String, String>,
}

#[async_trait]
impl DaemonService for MockDaemonService {
    async fn handle_request(&self, request: &str) -> Result<String, Box<dyn std::error::Error>> {
        if self.should_fail {
            return Err("Mock failure".into());
        }
        
        if let Some(response) = self.mock_responses.get(request) {
            Ok(response.clone())
        } else {
            Ok("Mock response".to_string())
        }
    }
}
```

## 🔗 **Integration Testing Strategy**

### **Component Interaction Testing**

#### **CLI-Daemon Communication**
```rust
// tests/integration/cli_daemon.rs
use apt_ostree::client::AptOstreeClient;
use apt_ostree::daemon::AptOstreeDaemon;

#[tokio::test]
async fn test_cli_daemon_communication() {
    // Start daemon
    let daemon = AptOstreeDaemon::start().await.unwrap();
    
    // Create client
    let client = AptOstreeClient::new().await.unwrap();
    
    // Test communication
    let status = client.get_system_status().await.unwrap();
    assert!(!status.deployments.is_empty());
    
    // Cleanup
    daemon.stop().await.unwrap();
}
```

#### **Package Installation Flow**
```rust
// tests/integration/package_installation.rs
use apt_ostree::commands::install::InstallCommand;
use apt_ostree::test_utils::TestEnvironment;

#[tokio::test]
async fn test_package_installation_flow() {
    let env = TestEnvironment::new().unwrap();
    
    // Create mock package
    env.create_mock_package("vim", "2:9.0.1378-1").unwrap();
    
    // Test installation
    let mut cmd = InstallCommand::new();
    let args = vec!["install".to_string(), "vim".to_string()];
    
    let result = cmd.execute(&args).await;
    assert!(result.is_ok());
    
    // Verify installation
    let status = cmd.get_installation_status().await.unwrap();
    assert!(status.installed_packages.contains(&"vim".to_string()));
}
```

### **Database Integration Testing**

#### **APT Database Operations**
```rust
// tests/integration/apt_database.rs
use apt_ostree::package::apt_manager::AptManager;

#[tokio::test]
async fn test_apt_database_operations() {
    let manager = AptManager::new();
    
    // Test package listing
    let packages = manager.list_available_packages().await.unwrap();
    assert!(!packages.is_empty());
    
    // Test package search
    let search_results = manager.search_packages("vim").await.unwrap();
    assert!(!search_results.is_empty());
    
    // Test dependency resolution
    let deps = manager.resolve_dependencies(&vec!["vim".to_string()]).await.unwrap();
    assert!(!deps.is_empty());
}

#### **OSTree Repository Operations**
```rust
// tests/integration/ostree_repository.rs
use apt_ostree::ostree::ostree_manager::OstreeManager;

#[tokio::test]
async fn test_ostree_repository_operations() {
    let manager = OstreeManager::new();
    
    // Test repository status
    let status = manager.get_repository_status().await.unwrap();
    assert!(status.is_healthy);
    
    // Test deployment operations
    let deployments = manager.list_deployments().await.unwrap();
    assert!(!deployments.is_empty());
    
    // Test commit operations
    let commits = manager.list_commits().await.unwrap();
    assert!(!commits.is_empty());
}
```

## 🖥️ **System Testing Strategy**

### **End-to-End Testing**

#### **Complete System Operations**
```rust
// tests/system/complete_operations.rs
use apt_ostree::test_utils::SystemTestEnvironment;

#[tokio::test]
async fn test_complete_system_upgrade() {
    let env = SystemTestEnvironment::new().await.unwrap();
    
    // Initial state
    let initial_status = env.run_command("apt-ostree status").await.unwrap();
    let initial_version = extract_version(&initial_status);
    
    // Perform upgrade
    let upgrade_result = env.run_command("apt-ostree upgrade").await.unwrap();
    assert!(upgrade_result.success);
    
    // Verify upgrade
    let final_status = env.run_command("apt-ostree status").await.unwrap();
    let final_version = extract_version(&final_status);
    
    assert_ne!(initial_version, final_version);
}
```

#### **Package Management Workflows**
```rust
// tests/system/package_management.rs
use apt_ostree::test_utils::SystemTestEnvironment;

#[tokio::test]
async fn test_package_install_uninstall_workflow() {
    let env = SystemTestEnvironment::new().await.unwrap();
    
    // Install package
    let install_result = env.run_command("apt-ostree install vim").await.unwrap();
    assert!(install_result.success);
    
    // Verify installation
    let status = env.run_command("apt-ostree status").await.unwrap();
    assert!(status.output.contains("vim"));
    
    // Uninstall package
    let uninstall_result = env.run_command("apt-ostree uninstall vim").await.unwrap();
    assert!(uninstall_result.success);
    
    // Verify uninstallation
    let final_status = env.run_command("apt-ostree status").await.unwrap();
    assert!(!final_status.output.contains("vim"));
}
```

### **Performance Testing**

#### **Load Testing**
```rust
// tests/performance/load_testing.rs
use tokio::time::{Duration, Instant};
use std::sync::Arc;
use tokio::sync::Semaphore;

#[tokio::test]
async fn test_concurrent_package_operations() {
    let semaphore = Arc::new(Semaphore::new(10)); // Limit concurrent operations
    let start_time = Instant::now();
    
    let mut handles = vec![];
    
    for i in 0..100 {
        let permit = semaphore.clone().acquire_owned().await.unwrap();
        
        let handle = tokio::spawn(async move {
            // Simulate package operation
            tokio::time::sleep(Duration::from_millis(10)).await;
            drop(permit);
        });
        
        handles.push(handle);
    }
    
    // Wait for all operations to complete
    for handle in handles {
        handle.await.unwrap();
    }
    
    let duration = start_time.elapsed();
    assert!(duration < Duration::from_secs(5)); // Should complete within 5 seconds
}
```

#### **Memory Usage Testing**
```rust
// tests/performance/memory_testing.rs
use std::alloc::{GlobalAlloc, Layout};
use std::sync::atomic::{AtomicUsize, Ordering};

static ALLOCATED: AtomicUsize = AtomicUsize::new(0);

struct TestAllocator;

unsafe impl GlobalAlloc for TestAllocator {
    unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
        ALLOCATED.fetch_add(layout.size(), Ordering::SeqCst);
        std::alloc::System.alloc(layout)
    }
    
    unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
        ALLOCATED.fetch_sub(layout.size(), Ordering::SeqCst);
        std::alloc::System.dealloc(ptr, layout);
    }
}

#[global_allocator]
static GLOBAL: TestAllocator = TestAllocator;

#[test]
fn test_memory_usage() {
    let initial_memory = ALLOCATED.load(Ordering::SeqCst);
    
    // Perform operations that allocate memory
    let _large_vec: Vec<u8> = vec![0; 1024 * 1024]; // 1MB
    
    let peak_memory = ALLOCATED.load(Ordering::SeqCst);
    let memory_increase = peak_memory - initial_memory;
    
    // Verify memory is properly managed
    assert!(memory_increase >= 1024 * 1024); // Should allocate at least 1MB
    
    // Memory should be freed after this scope
    drop(_large_vec);
    
    let final_memory = ALLOCATED.load(Ordering::SeqCst);
    assert_eq!(final_memory, initial_memory); // Memory should be freed
}
```

## 🔒 **Security Testing Strategy**

### **Authorization Testing**

#### **Polkit Integration Testing**
```rust
// tests/security/polkit_integration.rs
use apt_ostree::security::polkit_manager::PolkitManager;

#[tokio::test]
async fn test_polkit_authorization() {
    let manager = PolkitManager::new();
    
    // Test authorized user
    let authorized_user = 1000; // Regular user
    let result = manager.check_authorization("org.projectatomic.aptostree.status", authorized_user).await;
    assert!(result.is_ok());
    
    // Test unauthorized action
    let result = manager.check_authorization("org.projectatomic.aptostree.upgrade", authorized_user).await;
    assert!(result.is_err()); // Should fail for regular user
}

#[tokio::test]
async fn test_polkit_policy_validation() {
    let manager = PolkitManager::new();
    
    // Test valid policy
    let valid_policy = "org.projectatomic.aptostree.status";
    let result = manager.validate_policy(valid_policy).await;
    assert!(result.is_ok());
    
    // Test invalid policy
    let invalid_policy = "org.projectatomic.aptostree.invalid";
    let result = manager.validate_policy(invalid_policy).await;
    assert!(result.is_err());
}
```

#### **Privilege Escalation Testing**
```rust
// tests/security/privilege_escalation.rs
use apt_ostree::security::privilege_manager::PrivilegeManager;

#[tokio::test]
async fn test_privilege_escalation_prevention() {
    let manager = PrivilegeManager::new();
    
    // Test that regular users cannot escalate privileges
    let regular_user = 1000;
    let result = manager.check_privilege_escalation(regular_user, "root").await;
    assert!(result.is_err()); // Should fail
    
    // Test that privileged operations require proper authorization
    let result = manager.check_privilege_escalation(regular_user, "sudo").await;
    assert!(result.is_err()); // Should fail
}
```

## 🚀 **CI/CD Integration**

### **GitHub Actions Workflow**

#### **Test Workflow**
```yaml
# .github/workflows/test.yml
name: Test Suite

on:
  push:
    branches: [ main, develop ]
  pull_request:
    branches: [ main ]

jobs:
  test:
    runs-on: ubuntu-latest
    
    strategy:
      matrix:
        rust-version: [1.70, 1.71, stable, nightly]
    
    steps:
    - uses: actions/checkout@v3
    
    - name: Install Rust
      uses: actions-rs/toolchain@v1
      with:
        toolchain: ${{ matrix.rust-version }}
        override: true
    
    - name: Install dependencies
      run: |
        sudo apt update
        sudo apt install -y libostree-dev libapt-pkg-dev libdbus-1-dev
    
    - name: Run tests
      run: |
        cargo test --verbose
        cargo test --test integration --verbose
        cargo test --test system --verbose
    
    - name: Run performance tests
      run: |
        cargo test --test performance --verbose
    
    - name: Run security tests
      run: |
        cargo test --test security --verbose
    
    - name: Generate coverage report
      run: |
        cargo install cargo-tarpaulin
        cargo tarpaulin --out Html --output-dir coverage
    
    - name: Upload coverage
      uses: codecov/codecov-action@v3
      with:
        file: ./coverage/tarpaulin-report.html
```

### **Test Environment Setup**

#### **Docker Test Environment**
```dockerfile
# tests/Dockerfile.test
FROM debian:trixie-slim

# Install system dependencies
RUN apt-get update && apt-get install -y \
    build-essential \
    pkg-config \
    libostree-dev \
    libapt-pkg-dev \
    libdbus-1-dev \
    libpolkit-gobject-1-dev \
    systemd \
    && rm -rf /var/lib/apt/lists/*

# Install Rust
RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
ENV PATH="/root/.cargo/bin:$PATH"

# Copy source code
COPY . /app
WORKDIR /app

# Run tests
CMD ["cargo", "test", "--all-features"]
```

## 📊 **Test Metrics and Reporting**

### **Coverage Reporting**

#### **Code Coverage Configuration**
```toml
# .cargo/config.toml
[target.'cfg(test)']
rustflags = [
    "-C", "instrument-coverage",
    "-C", "codegen-units=1",
    "-C", "inline-threshold=0"
]

[profile.test]
opt-level = 0
debug = true
```

#### **Coverage Analysis**
```rust
// tests/coverage/coverage_analysis.rs
use std::collections::HashMap;

pub struct CoverageAnalyzer {
    pub line_coverage: HashMap<String, f64>,
    pub branch_coverage: HashMap<String, f64>,
    pub function_coverage: HashMap<String, f64>,
}

impl CoverageAnalyzer {
    pub fn analyze_coverage(&self) -> CoverageReport {
        let total_lines = self.line_coverage.len();
        let covered_lines = self.line_coverage.values().filter(|&&c| c > 0.0).count();
        let line_coverage_percent = (covered_lines as f64 / total_lines as f64) * 100.0;
        
        CoverageReport {
            line_coverage: line_coverage_percent,
            branch_coverage: self.calculate_branch_coverage(),
            function_coverage: self.calculate_function_coverage(),
            uncovered_files: self.find_uncovered_files(),
        }
    }
    
    pub fn generate_report(&self) -> String {
        let report = self.analyze_coverage();
        format!(
            "Coverage Report:\n\
             Line Coverage: {:.2}%\n\
             Branch Coverage: {:.2}%\n\
             Function Coverage: {:.2}%\n\
             Uncovered Files: {}",
            report.line_coverage,
            report.branch_coverage,
            report.function_coverage,
            report.uncovered_files.len()
        )
    }
}
```

### **Performance Metrics**

#### **Performance Benchmarking**
```rust
// tests/performance/benchmarks.rs
use criterion::{black_box, criterion_group, criterion_main, Criterion};
use apt_ostree::commands::status::StatusCommand;

fn benchmark_status_command(c: &mut Criterion) {
    let mut cmd = StatusCommand::new();
    
    c.bench_function("status_command", |b| {
        b.iter(|| {
            let args = vec!["status".to_string()];
            black_box(cmd.execute(&args))
        })
    });
}

fn benchmark_package_parsing(c: &mut Criterion) {
    let dpkg_output = "Package: vim\nVersion: 2:9.0.1378-1\nDepends: libc6";
    
    c.bench_function("parse_dpkg_output", |b| {
        b.iter(|| {
            black_box(parse_dpkg_output(dpkg_output))
        })
    });
}

criterion_group!(benches, benchmark_status_command, benchmark_package_parsing);
criterion_main!(benches);
```

## 🎯 **Testing Best Practices**

### **Test Organization**

#### **Test File Structure**
```
tests/
├── unit/                    # Unit tests
│   ├── commands/           # Command unit tests
│   ├── package/            # Package management tests
│   └── ostree/             # OSTree integration tests
├── integration/             # Integration tests
│   ├── cli_daemon.rs       # CLI-daemon communication
│   ├── package_flow.rs     # Package installation flow
│   └── database.rs         # Database operations
├── system/                  # System tests
│   ├── complete_ops.rs     # End-to-end operations
│   └── package_mgmt.rs     # Package management workflows
├── performance/             # Performance tests
│   ├── load_testing.rs     # Load testing
│   └── memory_testing.rs   # Memory usage testing
├── security/                # Security tests
│   ├── polkit.rs           # Polkit integration
│   └── privilege.rs        # Privilege escalation
└── utils/                   # Test utilities
    ├── mock_services.rs     # Mock service implementations
    └── test_env.rs          # Test environment setup
```

### **Test Data Management**

#### **Test Data Fixtures**
```rust
// tests/fixtures/package_data.rs
pub const MOCK_PACKAGE_DPKG: &str = r#"
Package: vim
Version: 2:9.0.1378-1
Architecture: amd64
Depends: libc6 (>= 2.34), libgpm2 (>= 1.6.4)
Recommends: vim-runtime
Suggests: ctags, vim-doc, vim-scripts
Installed-Size: 2048
Maintainer: Debian Vim Maintainers <pkg-vim-maintainers@lists.alioth.debian.org>
Description: Vi IMproved - enhanced vi editor
 Vim is an almost compatible version of the UNIX editor Vi.
"#;

pub const MOCK_PACKAGE_APT_CACHE: &str = r#"
Package: vim
Version: 2:9.0.1378-1
Installed: (none)
Candidate: 2:9.0.1378-1
Version table:
 *** 2:9.0.1378-1 500
        500 http://deb.debian.org/debian trixie/main amd64 Packages
        100 /var/lib/dpkg/status
"#;
```

## 🔄 **Continuous Testing**

### **Pre-commit Hooks**

#### **Git Hooks Configuration**
```bash
#!/bin/bash
# .git/hooks/pre-commit

echo "Running pre-commit tests..."

# Run unit tests
cargo test --lib || exit 1

# Run integration tests
cargo test --test integration || exit 1

# Check code formatting
cargo fmt -- --check || exit 1

# Run clippy
cargo clippy -- -D warnings || exit 1

# Run security audit
cargo audit || exit 1

echo "Pre-commit tests passed!"
```

### **Test Automation**

#### **Automated Test Execution**
```rust
// tests/automation/test_runner.rs
use tokio::time::{Duration, Instant};
use std::collections::HashMap;

pub struct TestRunner {
    pub test_suites: HashMap<String, TestSuite>,
    pub results: Vec<TestResult>,
}

impl TestRunner {
    pub async fn run_all_tests(&mut self) -> TestSummary {
        let start_time = Instant::now();
        let mut passed = 0;
        let mut failed = 0;
        let mut skipped = 0;
        
        for (name, suite) in &self.test_suites {
            println!("Running test suite: {}", name);
            
            let result = suite.run().await;
            match result.status {
                TestStatus::Passed => passed += 1,
                TestStatus::Failed => failed += 1,
                TestStatus::Skipped => skipped += 1,
            }
            
            self.results.push(result);
        }
        
        let duration = start_time.elapsed();
        
        TestSummary {
            total: passed + failed + skipped,
            passed,
            failed,
            skipped,
            duration,
        }
    }
    
    pub fn generate_report(&self) -> String {
        let summary = self.calculate_summary();
        format!(
            "Test Execution Report:\n\
             Total Tests: {}\n\
             Passed: {}\n\
             Failed: {}\n\
             Skipped: {}\n\
             Success Rate: {:.2}%\n\
             Duration: {:?}",
            summary.total,
            summary.passed,
            summary.failed,
            summary.skipped,
            (summary.passed as f64 / summary.total as f64) * 100.0,
            summary.duration
        )
    }
}
```

## 🎯 **Next Steps**

### **Immediate Actions**
1. **Implement test utilities** and mock services
2. **Set up CI/CD pipeline** with GitHub Actions
3. **Create test fixtures** for common scenarios
4. **Establish test coverage** targets

### **Short-term Goals**
1. **Achieve 80%+ code coverage** across all components
2. **Implement automated testing** for all CLI commands
3. **Set up performance benchmarking** and monitoring
4. **Establish security testing** pipeline

### **Long-term Vision**
1. **100% test coverage** for critical components
2. **Automated security scanning** and vulnerability detection
3. **Performance regression testing** and alerting
4. **Comprehensive test reporting** and analytics

---

*This testing strategy provides a comprehensive approach to ensuring apt-ostree reliability, performance, and security. For detailed implementation information, refer to the architecture documents in the `docs/apt-ostree-daemon-plan/architecture/` directory.*
