fix: overwrites registered components for stubs

packages/create-instance/create-instance.js

@@ -59,14 +59,21 @@ export default function createInstance (
 
   const instanceOptions = { ...options }
   deleteoptions(instanceOptions)
+  // $FlowIgnore
+  const stubComponents = createComponentStubs(component.components, options.stubs)
+
   if (options.stubs) {
     instanceOptions.components = {
       ...instanceOptions.components,
       // $FlowIgnore
-      ...createComponentStubs(component.components, options.stubs)
+      ...stubComponents
     }
   }
 
+  Object.keys(stubComponents).forEach(c => {
+    vue.component(c, stubComponents[c])
+  })
+
   const vm = new Constructor(instanceOptions)
 
   addAttrs(vm, options.attrs)

test/resources/utils.js

@@ -80,6 +80,14 @@ export function itSkipIf (predicate, spec, cb) {
   }
 }
 
+itSkipIf.only = (predicate, spec, cb) => {
+  if (predicate) {
+    it.skip(spec, cb)
+  } else {
+    it.only(spec, cb)
+  }
+}
+
 export function itDoNotRunIf (predicate, spec, cb) {
   if (predicate) {
     () => {}
@@ -88,8 +96,20 @@ export function itDoNotRunIf (predicate, spec, cb) {
   }
 }
 
+itDoNotRunIf.only = (predicate, spec, cb) => {
+  if (!predicate) {
+    it.only(spec, cb)
+  }
+}
+
 export function describeIf (predicate, spec, cb) {
   if (predicate) {
     describe(spec, cb)
   }
 }
+
+describeIf.only = (predicate, spec, cb) => {
+  if (predicate) {
+    describe(spec, cb)
+  }
+}

test/specs/mounting-options/stubs.spec.js

@@ -248,6 +248,23 @@ describeWithMountingMethods('options.stub', (mountingMethod) => {
     expect(HTML).to.contain('<span>')
   })
 
+  itDoNotRunIf(
+    mountingMethod.name === 'shallow' ||
+    mountingMethod.name === 'renderToString',
+    'stubs on child components', () => {
+      const TestComponent = {
+        template: '<transition><span /></transition>'
+      }
+
+      const wrapper = mountingMethod({
+        components: { 'test-component': TestComponent },
+        template: '<test-component />'
+      }, {
+        stubs: ['transition']
+      })
+      expect(wrapper.find('span').exists()).to.equal(false)
+    })
+
   it('converts config to array if stubs is an array', () => {
     const localVue = createLocalVue()
     config.stubs['time-component'] = '<p />'

test/specs/wrapper/setProps.spec.js

@@ -105,7 +105,7 @@ describeWithShallowAndMount('setProps', (mountingMethod) => {
     expect(wrapper.text()).to.equal('There is no message yet')
   })
 
-  it.only('runs watchers correctly', () => {
+  it('runs watchers correctly', () => {
     const TestComponent = {
       template: `<div id="app">
         {{ stringified }}