/health_check with integration test implemented

.gitignore

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+/target

Cargo.toml

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+[package]
+name = "zero2prod"
+version = "0.1.0"
+authors = ["Andre Heber <andre.heber@gmx.net>"]
+edition = "2021"
+
+[lib]
+path = "src/lib.rs"
+
+[[bin]]
+path = "src/main.rs"
+name = "zero2prod"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+actix-web = "4"
+tokio = { version="1", features = ["macros", "rt-multi-thread"] }
+reqwest = "0.11"

src/lib.rs

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+use actix_web::{web, App, HttpRequest, HttpResponse, HttpServer, Responder};
+use actix_web::dev::Server;
+use std::net::TcpListener;
+
+async fn health_check() -> HttpResponse {
+	HttpResponse::Ok().into()
+}
+
+pub fn run(listener: TcpListener) -> Result<Server, std::io::Error> {
+	let server = HttpServer::new(|| {
+		App::new()
+			.route("/health_check", web::get().to(health_check))
+	})
+	.listen(listener)?
+	.run();
+
+	Ok(server)
+}

src/main.rs

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+use std::net::TcpListener;
+
+use zero2prod::run;
+
+#[tokio::main]
+async fn main() -> std::io::Result<()> {
+	let listener = TcpListener::bind("127.0.0.1:8000").expect("Failed to bind random port");
+	run(listener)?.await
+}

tests/health_check.rs

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+use std::net::TcpListener;
+
+#[tokio::test]
+async fn health_check_works() {
+	let address = spawn_app();
+	let health_check_endpoint = format!("{}/health_check", address);
+	let client = reqwest::Client::new();
+	let response = client.get(health_check_endpoint)
+		.send().await.expect("Failed to execute request.");
+
+	assert!(response.status().is_success());
+	assert_eq!(Some(0), response.content_length());
+}
+
+fn spawn_app() -> String {
+	let listener = TcpListener::bind("127.0.0.1:0").expect("Failed to bind random port");
+	let port = listener.local_addr().unwrap().port();
+
+	let server = zero2prod::run(listener).expect("Failed to bind address");
+	tokio::spawn(server);
+
+	format!("http://127.0.0.1:{}", port)
+}