[IMP] *: re-add a bunch of tests

src/component/lifecycle_hooks.ts

@@ -16,12 +16,12 @@ export function onWillUpdateProps(fn: (nextProps: any) => Promise<void> | void |
 
 export function onMounted(fn: () => void | any) {
   const node = getCurrent()!;
-  node.mounted.push(fn);
+  node.mounted.unshift(fn);
 }
 
 export function onWillPatch(fn: () => Promise<void> | any | void) {
   const node = getCurrent()!;
-  node.willPatch.push(fn);
+  node.willPatch.unshift(fn);
 }
 
 export function onPatched(fn: () => void | any) {

src/refs.ts

@@ -19,7 +19,7 @@ export function useRef<C extends Component = Component>(name: string): Ref<C> {
   return {
     get el(): HTMLElement | null {
       const val = node.refs[name];
-      return val!;
+      return val || null;
       // if (val instanceof HTMLElement) {
       //   return val;
       // } else if (val instanceof Component) {