Fix fs2 tests

crates/gpui2/src/executor.rs

@@ -220,7 +220,7 @@ impl Executor {
 
     #[cfg(any(test, feature = "test-support"))]
     pub fn simulate_random_delay(&self) -> impl Future<Output = ()> {
-        self.dispatcher.as_test().unwrap().simulate_random_delay()
+        self.spawn(self.dispatcher.as_test().unwrap().simulate_random_delay())
     }
 
     #[cfg(any(test, feature = "test-support"))]