Vue-test-utils: setProps doesn't update watchers

[vladferix]

I actually still have some issues where one watcher should update another field. Version 1.0.0-beta.9.

props: {
   name: String,
},
data: {
  fullname: ''
},
watch: {
       name(val) {
           this.fullname = val + ' surname';
        },
 }

...
...
wrapper.setProps({
  name: 'new name'
})
wrapper.vm.fullname = 'old name surname';
// however, after calling wrapper.update() it got updated, but not rerendered. And again, after second wrapper.update() it is rendered. I have transition-group element in my code, but it is stubbed

[LinusBorg]

I think the problem is that in the current implementation, watchers are run after the _render() call:

https://github.com/vuejs/vue-test-utils/commit/e4151b00ed72da134b8e6f38239824c87c715ce3#diff-dbfd1670fb2dd50be051adb6643c8c24R18

Usually all watchers would run before the component re-renders.

[eddyerburgh]

@vladferix can you post a full reproduction? I'm unable to reproduce using the code you posted

[vladferix]

@eddyerburgh okay, here it is
vue-test-utils-bug.zip

[eddyerburgh]

This is fixed in https://github.com/vuejs/vue-test-utils/commit/c095221a3a05595a4f49aaeda5e7d2e888b9e092