Comment posting is idempotent + tests

tests/api/comments.rs

@@ -0,0 +1,163 @@
+use crate::helpers::{TestApp, fake_post_body};
+use sqlx::PgPool;
+
+#[sqlx::test]
+async fn visitor_can_leave_a_comment(connection_pool: PgPool) {
+    let app = TestApp::spawn(connection_pool).await;
+    app.admin_login().await;
+    app.post_create_post(&fake_post_body()).await;
+    let post_id = {
+        let record = sqlx::query!("SELECT post_id FROM posts")
+            .fetch_one(&app.connection_pool)
+            .await
+            .unwrap();
+        record.post_id
+    };
+    let comment_author = "Author";
+    let comment_content = "Content";
+    let comment_body = serde_json::json!({
+        "author": comment_author,
+        "content": comment_content,
+        "idempotency_key": "key",
+    });
+    app.post_comment(&post_id, &comment_body).await;
+    let post = app.get_post_html(post_id).await;
+    assert!(post.contains(comment_author));
+    assert!(post.contains(comment_content));
+}
+
+#[sqlx::test]
+async fn visitor_can_comment_anonymously(connection_pool: PgPool) {
+    let app = TestApp::spawn(connection_pool).await;
+    app.admin_login().await;
+    app.post_create_post(&fake_post_body()).await;
+    let post_id = {
+        let record = sqlx::query!("SELECT post_id FROM posts")
+            .fetch_one(&app.connection_pool)
+            .await
+            .unwrap();
+        record.post_id
+    };
+    let comment_content = "Content";
+    let comment_body = serde_json::json!({
+        "content": comment_content,
+        "idempotency_key": "key",
+    });
+    app.post_comment(&post_id, &comment_body).await;
+    let post = app.get_post_html(post_id).await;
+    assert!(post.contains("Anonymous"));
+    assert!(post.contains(comment_content));
+}
+
+#[sqlx::test]
+async fn comment_with_invalid_body_is_rejected(connection_pool: PgPool) {
+    let app = TestApp::spawn(connection_pool).await;
+    app.admin_login().await;
+    app.post_create_post(&fake_post_body()).await;
+    let post_id = {
+        let record = sqlx::query!("SELECT post_id FROM posts")
+            .fetch_one(&app.connection_pool)
+            .await
+            .unwrap();
+        record.post_id
+    };
+    let test_cases = [
+        (
+            serde_json::json!({ "idempotency_key": "key" }),
+            "a missing content",
+        ),
+        (
+            serde_json::json!({ "idempotency_key": "key", "content": "" }),
+            "an empty content",
+        ),
+    ];
+    for (invalid_body, message) in test_cases {
+        let response = app.post_comment(&post_id, &invalid_body).await;
+        let html = response.text().await.unwrap();
+        dbg!(&html);
+        assert!(
+            !html.contains("Your comment has been posted"),
+            "The API did not reject the request when the body had {}",
+            message
+        );
+    }
+}
+
+#[sqlx::test]
+async fn comment_is_deleted_when_post_is_deleted(connection_pool: PgPool) {
+    let app = TestApp::spawn(connection_pool).await;
+    app.admin_login().await;
+    app.post_create_post(&fake_post_body()).await;
+    let post_id = {
+        let record = sqlx::query!("SELECT post_id FROM posts")
+            .fetch_one(&app.connection_pool)
+            .await
+            .unwrap();
+        record.post_id
+    };
+    let comment_author = "Author";
+    let comment_content = "Content";
+    let comment_body = serde_json::json!({
+        "author": comment_author,
+        "content": comment_content,
+        "idempotency_key": "key",
+    });
+    app.post_comment(&post_id, &comment_body).await;
+    let comment_id = {
+        let record = sqlx::query!("SELECT comment_id FROM comments")
+            .fetch_one(&app.connection_pool)
+            .await
+            .unwrap();
+        record.comment_id
+    };
+    app.delete_post(post_id).await;
+    let record = sqlx::query!("SELECT * FROM comments WHERE comment_id = $1", comment_id)
+        .fetch_optional(&app.connection_pool)
+        .await
+        .unwrap();
+    assert!(record.is_none());
+}
+
+#[sqlx::test]
+async fn comment_posting_is_idempotent(connection_pool: PgPool) {
+    let app = TestApp::spawn(connection_pool).await;
+    app.admin_login().await;
+
+    app.post_create_post(&fake_post_body()).await;
+    let post_id = {
+        let record = sqlx::query!("SELECT post_id FROM posts")
+            .fetch_one(&app.connection_pool)
+            .await
+            .unwrap();
+        record.post_id
+    };
+    let comment_body = serde_json::json!({
+        "author": "author",
+        "content": "content",
+        "idempotency_key": "key",
+    });
+    let response = app.post_comment(&post_id, &comment_body).await;
+    assert!(
+        response
+            .text()
+            .await
+            .unwrap()
+            .contains("Your comment has been posted")
+    );
+    let response = app.post_comment(&post_id, &comment_body).await;
+    assert!(
+        response
+            .text()
+            .await
+            .unwrap()
+            .contains("Your comment has been posted")
+    );
+
+    let count = sqlx::query_scalar!("SELECT count(*) FROM comments")
+        .fetch_one(&app.connection_pool)
+        .await
+        .unwrap()
+        .unwrap_or(0);
+
+    assert_eq!(count, 1);
+}

tests/api/helpers.rs

@@ -359,6 +359,18 @@ impl TestApp {
             .expect("Failed to execute request")
     }
 
+    pub async fn post_comment<Body>(&self, post_id: &Uuid, body: &Body) -> reqwest::Response
+    where
+        Body: serde::Serialize,
+    {
+        self.api_client
+            .post(format!("{}/posts/{post_id}/comments", self.address))
+            .form(body)
+            .send()
+            .await
+            .expect("Failed to execute request")
+    }
+
     pub async fn delete_post(&self, post_id: Uuid) {
         self.api_client
             .delete(format!("{}/admin/posts/{}", self.address, post_id))

tests/api/main.rs

@@ -1,5 +1,6 @@
 mod admin_dashboard;
 mod change_password;
+mod comments;
 mod health_check;
 mod helpers;
 mod login;