Unsubscribe option available on website

tests/api/unsubscribe_confirm.rs

@@ -0,0 +1,67 @@
+use crate::helpers::{TestApp, when_sending_an_email};
+use wiremock::ResponseTemplate;
+
+#[tokio::test]
+async fn unsubscribe_form_sends_a_valid_link_if_email_is_in_database() {
+    let app = TestApp::spawn().await;
+    app.create_confirmed_subscriber().await;
+
+    when_sending_an_email()
+        .respond_with(ResponseTemplate::new(200))
+        .expect(1)
+        .mount(&app.email_server)
+        .await;
+
+    let record = sqlx::query!("SELECT email, unsubscribe_token FROM subscriptions")
+        .fetch_one(&app.connection_pool)
+        .await
+        .expect("Failed to fetch saved email and token");
+
+    let body = serde_json::json!({
+        "email": record.email
+    });
+    app.post_unsubscribe(&body).await;
+
+    let email_request = app
+        .email_server
+        .received_requests()
+        .await
+        .unwrap()
+        .pop()
+        .unwrap();
+
+    let unsubscribe_links = app.get_unsubscribe_links(&email_request);
+
+    assert!(
+        unsubscribe_links
+            .html
+            .as_str()
+            .contains(&record.unsubscribe_token.unwrap())
+    );
+
+    let response = reqwest::get(unsubscribe_links.html)
+        .await
+        .unwrap()
+        .error_for_status()
+        .unwrap();
+    let html_fragment = response.text().await.unwrap();
+    assert!(html_fragment.contains("Good bye, friend"));
+}
+
+#[tokio::test]
+async fn an_invalid_email_is_ignored() {
+    let app = TestApp::spawn().await;
+    app.create_confirmed_subscriber().await;
+
+    when_sending_an_email()
+        .respond_with(ResponseTemplate::new(200))
+        .expect(0)
+        .mount(&app.email_server)
+        .await;
+
+    let body = serde_json::json!({
+        "email": "invalid.email@example.com"
+    });
+
+    app.post_unsubscribe(&body).await;
+}