More tests, not found page and dashboard fixes

When post was deleted, website shows a 404 page insead of an 500 page.
Also made the dashboard empty page message more explicit.

tests/api/posts.rs

@@ -82,3 +82,86 @@ async fn confirmed_subscribers_are_notified_when_a_new_post_is_published(connect
 
     app.dispatch_all_pending_emails().await;
 }
+
+#[sqlx::test]
+async fn new_posts_are_visible_on_the_website(connection_pool: PgPool) {
+    let app = TestApp::spawn(connection_pool).await;
+
+    let html = app.get_posts_html().await;
+    assert!(html.contains("No posts yet"));
+
+    let title = subject();
+    let content = content();
+    let body = serde_json::json!({
+        "title": title,
+        "content": content,
+        "idempotency_key": Uuid::new_v4(),
+
+    });
+    app.admin_login().await;
+    app.post_create_post(&body).await;
+
+    app.logout().await;
+    let html = app.get_posts_html().await;
+    assert!(html.contains(&title));
+
+    let post = sqlx::query!("SELECT post_id FROM posts")
+        .fetch_one(&app.connection_pool)
+        .await
+        .unwrap();
+    let html = app.get_post_html(post.post_id).await;
+    assert!(html.contains(&title));
+}
+
+#[sqlx::test]
+async fn visitor_can_read_a_blog_post(connection_pool: PgPool) {
+    let app = TestApp::spawn(connection_pool).await;
+
+    let title = subject();
+    let content = content();
+    let body = serde_json::json!({
+        "title": title,
+        "content": content,
+        "idempotency_key": Uuid::new_v4(),
+
+    });
+    app.admin_login().await;
+    app.post_create_post(&body).await;
+    app.logout().await;
+
+    let html = app.get_posts_html().await;
+    assert!(html.contains(&title));
+
+    let post = sqlx::query!("SELECT post_id FROM posts")
+        .fetch_one(&app.connection_pool)
+        .await
+        .unwrap();
+    let html = app.get_post_html(post.post_id).await;
+    assert!(html.contains(&title));
+}
+
+#[sqlx::test]
+async fn a_deleted_blog_post_returns_404(connection_pool: PgPool) {
+    let app = TestApp::spawn(connection_pool).await;
+    app.admin_login().await;
+
+    let title = subject();
+    let content = content();
+    let body = serde_json::json!({
+        "title": title,
+        "content": content,
+        "idempotency_key": Uuid::new_v4(),
+
+    });
+    app.post_create_post(&body).await;
+
+    let post = sqlx::query!("SELECT post_id FROM posts")
+        .fetch_one(&app.connection_pool)
+        .await
+        .unwrap();
+
+    app.delete_post(post.post_id).await;
+
+    let html = app.get_post_html(post.post_id).await;
+    assert!(html.contains("Not Found"));
+}