test: test suspense fallback

packages/runtime-core/src/suspense.ts

@@ -1,5 +1,6 @@
 import { VNode, normalizeVNode } from './vnode'
 import { ShapeFlags } from '.'
+import { isFunction } from '@vue/shared'
 
 export const SuspenseSymbol = __DEV__ ? Symbol('Suspense key') : Symbol()
 
@@ -48,16 +49,16 @@ export function normalizeSuspenseChildren(
   content: VNode
   fallback: VNode
 } {
-  const { shapeFlag } = vnode
-  const children = vnode.children as any
+  const { shapeFlag, children } = vnode
   if (shapeFlag & ShapeFlags.SLOTS_CHILDREN) {
+    const { default: d, fallback } = children as any
     return {
-      content: normalizeVNode(children.default()),
-      fallback: normalizeVNode(children.fallback ? children.fallback() : null)
+      content: normalizeVNode(isFunction(d) ? d() : d),
+      fallback: normalizeVNode(isFunction(fallback) ? fallback() : fallback)
     }
   } else {
     return {
-      content: normalizeVNode(children),
+      content: normalizeVNode(children as any),
       fallback: normalizeVNode(null)
     }
   }