Merge pull request #65 from vuejs/feat/add-props-accessor

Add props accessor method

Author: lmiller1990

src/vue-wrapper.ts

@@ -46,6 +46,12 @@ export class VueWrapper<T extends ComponentPublicInstance>
     return this.componentVM
   }
 
+  props(selector?: string) {
+    return selector
+      ? this.componentVM.$props[selector]
+      : this.componentVM.$props
+  }
+
   classes(className?: string) {
     return new DOMWrapper(this.element).classes(className)
   }

tests/props.spec.ts

@@ -0,0 +1,25 @@
+import { mount } from '../src'
+import WithProps from './components/WithProps.vue'
+import Hello from './components/Hello.vue'
+
+describe('props', () => {
+  it('returns a single prop applied to a component', () => {
+    const wrapper = mount(WithProps, { props: { msg: 'ABC' } })
+    expect(wrapper.props('msg')).toEqual('ABC')
+  })
+
+  it('returns all props applied to a component', () => {
+    const wrapper = mount(WithProps, { props: { msg: 'ABC' } })
+    expect(wrapper.props()).toEqual({ msg: 'ABC' })
+  })
+
+  it('returns undefined if props does not exist', () => {
+    const wrapper = mount(WithProps, { props: { msg: 'ABC' } })
+    expect(wrapper.props('foo')).toEqual(undefined)
+  })
+
+  it('returns empty object for components without props', () => {
+    const wrapper = mount(Hello)
+    expect(wrapper.props()).toEqual({})
+  })
+})