chore: test todos

packages/runtime-core/__tests__/vdomElement.spec.ts

@@ -4,4 +4,6 @@ describe('vdom: element', () => {
   test.todo('with direct text children')
 
   test.todo('with text node children')
+
+  test.todo('handle already mounted VNode')
 })

packages/runtime-core/__tests__/vnode.spec.ts

@@ -18,4 +18,6 @@ describe('vnode', () => {
   test.todo('node type inference')
 
   test.todo('cloneVNode')
+
+  test.todo('mergeProps')
 })