feat: subscription post answer

Cargo.toml

@@ -12,6 +12,7 @@ poath = "src/lib.rs"
 [dependencies]
 actix-web = "4.3.1"
 reqwest = "0.11.20"
+serde = { version = "1.0.188", features = ["derive"] }
 tokio = { version = "1", features = ["macros", "rt-multi-thread"] }
 
 [[bin]]

src/lib.rs

@@ -10,12 +10,21 @@ async fn health_check() -> impl Responder {
     HttpResponse::Ok()
 }
 
+#[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("/", web::get().to(greet))
             .route("/health_check", web::get().to(health_check))
-            .route("/{name}", web::get().to(greet))
+            .route("/subscriptions", web::post().to(subscribe))
     })
     .listen(listener)?
     .run();

tests/health_check.rs

@@ -23,3 +23,50 @@ async fn health_check_works() {
     assert!(response.status().is_success());
     assert_eq!(Some(0), response.content_length());
 }
+
+#[tokio::test]
+async fn subscribe_returns_a_200_for_valid_form_data() {
+    // Arrange
+    let app_address = spawn_app();
+    let client = reqwest::Client::new();
+    let body = "name=le%20guin&email=ursula_le_guin%40gmail.com";
+    // Act
+    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
+    assert_eq!(200, response.status().as_u16());
+}
+
+#[tokio::test]
+async fn subscribe_returns_a_400_when_data_is_missing() {
+    // Arrange
+    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 {
+        // Act
+        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
+        assert_eq!(
+            400,
+            response.status().as_u16(),
+            "The API did not fail with 400 Bad Request when the payload was {}.",
+            error_message
+        );
+    }
+}