test($compile): #7048 warn if both v-model and v-bind:value used on same element

src/compiler/parser/index.js

@@ -598,6 +598,15 @@ function makeAttrsMap (attrs: Array<Object>): Object {
     }
     map[attrs[i].name] = attrs[i].value
   }
+  if (
+    process.env.NODE_ENV !== 'production' &&
+    map['v-model'] &&
+    (map['v-bind:value'] || map[':value']) &&
+    (!map['type'] || map['type'] === 'text')
+  ) {
+    var vBind = map['v-bind:value'] ? 'v-bind:value' : ':value'
+    warn('v-model and ' + vBind + ' used on the same text input')
+  }
   return map
 }
 

test/unit/features/directives/model-text.spec.js

@@ -250,6 +250,26 @@ describe('Directive v-model text', () => {
     expect('You are binding v-model directly to a v-for iteration alias').toHaveBeenWarned()
   })
 
+  it('warn if both v-model and v-bind:value are used on the same text input', () => {
+    new Vue({
+      data: {
+        test: 'foo'
+      },
+      template: '<input type="text" v-model="test" v-bind:value="test"/>'
+    }).$mount()
+    expect('v-model and v-bind:value used on the same text input').toHaveBeenWarned()
+  })
+
+  it('warn if both v-model and :value are used on the same text input', () => {
+    new Vue({
+      data: {
+        test: 'foo'
+      },
+      template: '<input type="text" v-model="test" :value="test"/>'
+    }).$mount()
+    expect('v-model and :value used on the same text input').toHaveBeenWarned()
+  })
+
   if (!isAndroid) {
     it('does not trigger extra input events with single compositionend', () => {
       const spy = jasmine.createSpy()