Error handling with thiserror and anyhow

tests/api/subscriptions.rs

@@ -122,3 +122,19 @@ async fn subscribe_sends_a_confirmation_email_with_a_link() {
     let confirmation_links = app.get_confirmation_links(email_request);
     assert_eq!(confirmation_links.html, confirmation_links.text);
 }
+
+#[tokio::test]
+async fn subscribe_fails_if_there_is_a_fatal_database_error() {
+    let app = TestApp::spawn().await;
+
+    let body = "name=Alphonse&email=alphonse.paix%40outlook.com";
+
+    sqlx::query!("ALTER TABLE subscriptions DROP COLUMN email")
+        .execute(&app.connection_pool)
+        .await
+        .unwrap();
+
+    let response = app.post_subscriptions(body.into()).await;
+
+    assert_eq!(response.status().as_u16(), 500);
+}