feat: support lazy modifier with setValue (#1467)

* feat: support lazy modifier with setValue

* fix: check lazy modifier

* fix: add check for vModifiers

* fix: include textarea in lazy check

* fix: skip lazy modifier spec for Vue 2.0

Author: lmiller1990

packages/test-utils/src/wrapper.js

@@ -569,10 +569,24 @@ export default class Wrapper implements BaseWrapper {
       tagName === 'TEXTAREA' ||
       tagName === 'SELECT'
     ) {
-      const event = tagName === 'SELECT' ? 'change' : 'input'
       // $FlowIgnore
       this.element.value = value
-      this.trigger(event)
+
+      if (tagName === 'SELECT') {
+        this.trigger('change')
+      } else {
+        this.trigger('input')
+      }
+
+      // for v-model.lazy, we need to trigger a change event, too.
+      // $FlowIgnore
+      if (
+        (tagName === 'INPUT' || tagName === 'TEXTAREA') &&
+        this.element._vModifiers &&
+        this.element._vModifiers.lazy
+      ) {
+        this.trigger('change')
+      }
     } else {
       throwError(`wrapper.setValue() cannot be called on this element`)
     }

test/resources/components/component-with-input.vue

@@ -36,6 +36,8 @@
     {{ textVal }}
     {{ selectVal }}
     {{ radioVal }}
+    <input id="lazy" type="text" v-model.lazy="lazy" />
+    {{ lazy }}
   </div>
 </template>
 
@@ -44,6 +46,7 @@ export default {
   name: 'component-with-input',
   data() {
     return {
+      lazy: '',
       checkboxVal: undefined,
       textVal: undefined,
       textareaVal: undefined,

test/specs/wrapper/setValue.spec.js

@@ -1,5 +1,7 @@
 import ComponentWithInput from '~resources/components/component-with-input.vue'
 import { describeWithShallowAndMount } from '~resources/utils'
+import { itDoNotRunIf } from 'conditional-specs'
+import { vueVersion } from '~resources/utils'
 import Vue from 'vue'
 
 describeWithShallowAndMount('setValue', mountingMethod => {
@@ -28,6 +30,19 @@ describeWithShallowAndMount('setValue', mountingMethod => {
     expect(wrapper.text()).to.contain('input text awesome binding')
   })
 
+  itDoNotRunIf(
+    vueVersion < 2.1,
+    'updates dom with input v-model.lazy',
+    async () => {
+      const wrapper = mountingMethod(ComponentWithInput)
+      const input = wrapper.find('input#lazy')
+      input.setValue('lazy')
+      await Vue.nextTick()
+
+      expect(wrapper.text()).to.contain('lazy')
+    }
+  )
+
   it('sets element of select value', () => {
     const wrapper = mountingMethod(ComponentWithInput)
     const select = wrapper.find('select')