🧪 Some idea.

packages/boot/tests/isomorphism_component.rs

@@ -0,0 +1,27 @@
+#![allow(dead_code)]
+#![allow(non_snake_case)]
+
+#[cfg(test)]
+mod test {
+    #[at(client)]
+    #[styled_component]
+    pub fn FetchButton() -> Html {
+        let result = use_state(|| "Click me".to_string());
+
+        html! {
+            <button onclick={{
+                let result = result.clone();
+                move |_| {
+                    if let Ok(response) = on!(server, (*result).clone(), async |result, global_memory| {
+                        global_memory.get("count")? += 1;
+                        Ok(format!("{} | {}", result, global_memory.get("count")?))
+                    }) {
+                        *result = response;
+                    }
+                }
+            }}>
+                {*result}
+            </button>
+        }
+    }
+}