initial commit

.gitignore

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+/target

Cargo.toml

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+[package]
+name = "mail_app"
+version = "0.1.0"
+authors = ["Nick Bland"]
+edition = "2021"
+
+[lib]
+path = "src/lib.rs"
+
+[dependencies]
+actix-web = "4.0.0-beta.8"
+
+[dev-dependencies]
+actix-rt = "2"
+reqwest = "0.11"
+tokio = "1"

src/lib.rs

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+use actix_web::{web, App, HttpResponse, HttpServer};
+use actix_web::dev::Server;
+use std::net::TcpListener;
+
+async fn health_check() -> HttpResponse {
+    HttpResponse::Ok().finish()
+}
+
+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 mail_app::run;
+use std::net::TcpListener;
+
+#[actix_web::main]
+async fn main() -> std::io::Result<()> {
+
+    let listener = TcpListener::bind("127.0.0.1:8000").expect("Failed to bind to 8000");
+
+    run(listener)?.await
+}

tests/health_check.rs

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+use std::net::TcpListener;
+
+#[actix_rt::test]
+async fn health_check_works() {
+    // Arrange
+    let address = spawn_app();
+    let client = reqwest::Client::new();
+
+    // Perform a 'reqwest' against endpoint
+
+    let response = client
+        .get(&format!("{}/health_check", &address))
+        .send()
+        .await
+        .expect("Failed to execute request.");
+
+    // Assert our test
+    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 to random port");
+    let port = listener.local_addr().unwrap().port();
+
+    let server = mail_app::run(listener).expect("Failed to bind address");
+
+    let _ = tokio::spawn(server);
+
+    format!("http://127.0.0.1:{}", port)
+}