test: test for runtime/h (#746)

Co-authored-by: webfansplz <>

Author: webfansplz

test/v3/runtime-core/h.spec.ts

@@ -0,0 +1,41 @@
+import { h, createApp } from '../../../src'
+import { mockWarn } from '../../helpers'
+
+describe('renderer: h', () => {
+  mockWarn(true)
+  it('should warn with called outside of render function', () => {
+    h('p', {})
+    expect(
+      '[Vue warn]: `createElement()` has been called outside of render function.'
+    ).toHaveBeenWarned()
+  })
+
+  it('should work with called outside of render function', () => {
+    const msg = 'hello world'
+    const vnode = h('hello-world', {
+      props: {
+        msg,
+      },
+    })
+    expect(
+      '[Vue warn]: `createElement()` has been called outside of render function.'
+    ).toHaveBeenWarned()
+    expect(vnode.tag).toEqual('hello-world')
+    expect(vnode.children).toBeUndefined()
+    expect(vnode.text).toBeUndefined()
+    expect(vnode.elm).toBeUndefined()
+    expect(vnode.ns).toBeUndefined()
+    expect(vnode.data?.props).toEqual({ msg })
+  })
+
+  it('render vnode with createElement with children', () => {
+    const Comp = {
+      setup() {
+        return () => h('div', void 0, [h('br'), 'hello world', h('br')])
+      },
+    }
+    const root = document.createElement('div')
+    const vm = createApp(Comp).mount(root)
+    expect(vm.$el.outerHTML).toBe(`<div><br>hello world<br></div>`)
+  })
+})