Fix notifications for membership changes too

crates/live_kit_client/src/test.rs

@@ -306,6 +306,16 @@ impl live_kit_server::api::Client for TestApiClient {
             token::VideoGrant::to_join(room),
         )
     }
+
+    fn guest_token(&self, room: &str, identity: &str) -> Result<String> {
+        let server = TestServer::get(&self.url)?;
+        token::create(
+            &server.api_key,
+            &server.secret_key,
+            Some(identity),
+            token::VideoGrant::for_guest(room),
+        )
+    }
 }
 
 pub type Sid = String;