Basic unsubscribe endpoint

tests/api/unsubscribe.rs

@@ -0,0 +1,31 @@
+use crate::helpers::TestApp;
+
+#[tokio::test]
+async fn unsubscribe_works_with_a_valid_token() {
+    let app = TestApp::spawn().await;
+    app.create_confirmed_subscriber().await;
+
+    let record = sqlx::query!("SELECT unsubscribe_token FROM subscriptions")
+        .fetch_one(&app.connection_pool)
+        .await
+        .expect("Failed to fetch saved token");
+
+    let response = app
+        .get_unsubscribe(
+            record
+                .unsubscribe_token
+                .expect("Confirmed subscriber should have a valid unsubscribe token"),
+        )
+        .await;
+
+    assert!(response.status().is_success());
+    let html_fragment = response.text().await.unwrap();
+    assert!(html_fragment.contains("Good bye, old friend"));
+
+    let record = sqlx::query!("SELECT email FROM subscriptions")
+        .fetch_optional(&app.connection_pool)
+        .await
+        .expect("Failed to fetch subscription table");
+
+    assert!(record.is_none());
+}