Red test.

tests/api/helpers.rs

@@ -1,5 +1,6 @@
 use sqlx::{Connection, Executor, PgConnection, PgPool};
 use uuid::Uuid;
+use wiremock::MockServer;
 use zero2prod::configuration::{get_configuration, DatabaseSettings};
 use zero2prod::startup::{get_connection_pool, Application};
 use zero2prod::telemetry::{get_subscriber, init_subscriber};
@@ -16,6 +17,7 @@ lazy_static::lazy_static! {
 pub struct TestApp {
     pub address: String,
     pub db_pool: PgPool,
+    pub email_server: MockServer,
 }
 
 impl TestApp {
@@ -31,6 +33,9 @@ impl TestApp {
 }
 
 pub async fn spawn_app() -> TestApp {
+    // Launch a mock server to stand in for Postmark's API
+    let email_server = MockServer::start().await;
+
     // Randomise configuration to ensure test isolation
     let configuration = {
         let mut c = get_configuration().expect("Failed to read configuration.");
@@ -38,6 +43,8 @@ pub async fn spawn_app() -> TestApp {
         c.database.database_name = Uuid::new_v4().to_string();
         // Use a random OS port
         c.application.port = 0;
+        // Use the mock server as email API
+        c.email_client.base_url = email_server.uri();
         c
     };
 
@@ -56,6 +63,7 @@ pub async fn spawn_app() -> TestApp {
         db_pool: get_connection_pool(&configuration.database)
             .await
             .expect("Failed to connect to the database"),
+        email_server,
     }
 }
 

tests/api/subscriptions.rs

@@ -1,4 +1,6 @@
 use crate::helpers::spawn_app;
+use wiremock::matchers::{method, path};
+use wiremock::{Mock, ResponseTemplate};
 
 #[actix_rt::test]
 async fn subscribe_returns_a_200_for_valid_form_data() {
@@ -21,6 +23,26 @@ async fn subscribe_returns_a_200_for_valid_form_data() {
     assert_eq!(saved.name, "le guin");
 }
 
+#[actix_rt::test]
+async fn subscribe_sends_a_confirmation_email_for_valid_data() {
+    // Arrange
+    let app = spawn_app().await;
+    let body = "name=le%20guin&email=ursula_le_guin%40gmail.com";
+
+    Mock::given(path("/email"))
+        .and(method("POST"))
+        .respond_with(ResponseTemplate::new(200))
+        .expect(1)
+        .mount(&app.email_server)
+        .await;
+
+    // Act
+    app.post_subscriptions(body.into()).await;
+
+    // Assert
+    // Mock asserts on drop
+}
+
 #[actix_rt::test]
 async fn subscribe_returns_a_400_when_data_is_missing() {
     // Arrange