Everything up until serde

email_newsletter/Cargo.toml

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+[package]
+name = "email_newsletter"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[lib]
+path = "src/lib.rs"
+
+[[bin]]
+path = "src/main.rs"
+name = "email_newsletter"
+
+[dependencies]
+actix-web = "4"
+serde = { version = "1", features = ["derive"] }
+tokio = { version = "1", features = ["macros", "rt-multi-thread"] }
+
+[dev-dependencies]
+reqwest = "0.11"

email_newsletter/src/lib.rs

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+use actix_web::{dev::Server, web, App, HttpResponse, HttpServer};
+use std::net::TcpListener;
+
+async fn health_check() -> HttpResponse {
+    HttpResponse::Ok().finish()
+}
+
+#[derive(serde::Deserialize)]
+struct FormData {
+    email: String,
+    name: String,
+}
+
+async fn subscribe(_form: web::Form<FormData>) -> 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))
+            .route("/subscriptions", web::post().to(subscribe))
+    })
+    .listen(listener)?
+    .run();
+
+    Ok(server)
+}

email_newsletter/src/main.rs

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+use std::net::TcpListener;
+
+use email_newsletter::run;
+
+#[tokio::main]
+async fn main() -> Result<(), std::io::Error> {
+    let listener = TcpListener::bind("127.0.0.1:0").expect("Failed to bind to address");
+
+    run(listener)?.await
+}

email_newsletter/tests/health_check.rs

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+use std::net::TcpListener;
+
+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 = email_newsletter::run(listener).expect("Failed to bind address");
+
+    let _ = tokio::spawn(server);
+
+    format!("http://127.0.0.1:{}", port)
+}
+
+#[tokio::test]
+async fn health_check_works() {
+    let address = spawn_app();
+    let client = reqwest::Client::new();
+
+    let response = client
+        .get(&format!("{}/health_check", &address))
+        .send()
+        .await
+        .expect("Failed to execute request");
+
+    assert!(response.status().is_success());
+    assert_eq!(Some(0), response.content_length());
+}
+
+#[tokio::test]
+async fn subscribe_returns_a_200_for_valid_form_data() {
+    let app_address = spawn_app();
+    let client = reqwest::Client::new();
+
+    let body = "name=le%20guin&email=ursula_le_guin%40gmail.com";
+    let response = client
+        .post(&format!("{}/subscriptions", &app_address))
+        .header("Content-type", "application/x-www-form-urlencoded")
+        .body(body)
+        .send()
+        .await
+        .expect("Failed to execute request");
+
+    assert_eq!(200, response.status().as_u16());
+}
+
+#[tokio::test]
+async fn subscribe_returns_a_400_when_data_is_missing() {
+    let app_address = spawn_app();
+    let client = reqwest::Client::new();
+    let test_cases = vec![
+        ("name=le%20guin", "missing the email"),
+        ("email=ursula_le_guin%40gmail.com", "missing the name"),
+        ("", "missing both name and email"),
+    ];
+
+    for (invalid_body, error_message) in test_cases {
+        let response = client
+            .post(&format!("{}/subscriptions", &app_address))
+            .header("Content-type", "application/x-www-form-urlencoded")
+            .body(invalid_body)
+            .send()
+            .await
+            .expect("Failed to execute request");
+
+        assert_eq!(
+            400,
+            response.status().as_u16(),
+            "The API did not fail with 400 Bad Request when the payload was {}",
+            error_message
+        );
+    }
+}