test the wasm side (#6726)

Signed-off-by: Jess Frazelle <github@jessfraz.com>

rust/kcl-lib/src/engine/conn_wasm.rs

@@ -22,6 +22,12 @@ extern "C" {
     #[derive(Debug, Clone)]
     pub type EngineCommandManager;
 
+    #[wasm_bindgen(constructor)]
+    pub fn new() -> EngineCommandManager;
+
+    #[wasm_bindgen(method, js_name = startFromWasm, catch)]
+    pub async fn start_from_wasm(this: &EngineCommandManager, token: &str) -> Result<JsValue, js_sys::Error>;
+
     #[wasm_bindgen(method, js_name = fireModelingCommandFromWasm, catch)]
     fn fire_modeling_cmd_from_wasm(
         this: &EngineCommandManager,