Chapter 47: Testing Your App in C++

Unit tests, integration tests, fuzz testing. In this chapter, you will learn testing your app in depth with C++ code examples, explanations, and best practices.

Overview

This chapter covers testing your app for Kungfu.js developers using C++. We will start with the basics, move through practical examples, and end with advanced techniques and common pitfalls.

Why This Matters

Understanding testing your app is essential because it is a core part of building web applications. Every real-world app needs to handle unit tests, integration tests, fuzz testing. Skipping this chapter would leave a gap in your knowledge that would cause problems later.

Code Example

Here is how to handle this in C++:

// Unit test example
#[test]
fn test_router() {
    let mut router = Router::new();
    router.get("/hello", handler).unwrap();
    
    match router.resolve(Method::Get, "/hello") {
        RouteResolution::Found { .. } => {},
        _ => panic!("expected Found"),
    }
}

// Integration test
#[tokio::test]
async fn test_server() {
    let resp = reqwest::get("http://localhost:3000/hello").await?;
    assert_eq!(resp.status(), 200);
}

Common Mistakes

• Not reading the documentation: Always check the API reference when something does not work as expected.
• Skipping security: Never disable the default middleware unless you have a very good reason. Security is not optional.
• Not testing: Write tests for your handlers. Kungfu.js makes this easy with the built-in test utilities.

Summary

In this chapter, you learned about testing your app in C++. You saw code examples, understood how things work under the hood, and learned about common mistakes to avoid.

What is Next?

In chapter 48, we will cover Performance Tuning: io_uring, SIMD JSON, buffer pooling.