runtime: add tests for spawn local on multi and current runtimes (#7687)

tokio/tests/rt_local.rs

@@ -111,6 +111,28 @@ fn test_spawn_local_from_guard_other_thread() {
     spawn_local(async {});
 }
 
+#[test]
+#[should_panic = "`spawn_local` called from outside of a `task::LocalSet` or `runtime::LocalRuntime`"]
+fn test_spawn_local_in_current_thread_runtime() {
+    let rt = tokio::runtime::Builder::new_current_thread()
+        .build()
+        .unwrap();
+
+    rt.block_on(async move {
+        spawn_local(async {});
+    })
+}
+
+#[test]
+#[should_panic = "`spawn_local` called from outside of a `task::LocalSet` or `runtime::LocalRuntime`"]
+fn test_spawn_local_in_multi_thread_runtime() {
+    let rt = tokio::runtime::Builder::new_multi_thread().build().unwrap();
+
+    rt.block_on(async move {
+        spawn_local(async {});
+    })
+}
+
 fn rt() -> tokio::runtime::LocalRuntime {
     tokio::runtime::Builder::new_current_thread()
         .enable_all()