fix: pass children to functional component

Author: eddyerburgh

src/lib/create-instance.js

@@ -34,7 +34,8 @@ export default function createConstructor (
       render (h) {
         return h(
           clonedComponent,
-          mountingOptions.context || component.FunctionalRenderContext
+          mountingOptions.context || component.FunctionalRenderContext,
+          mountingOptions.context && mountingOptions.context.children
         )
       }
     }

test/unit/specs/mount/options/context.spec.js

@@ -65,4 +65,19 @@ describe('context', () => {
     const wrapper = mount(Component)
     expect(wrapper.element.textContent).to.equal(defaultValue)
   })
+
+  it('mounts functional component with a defined context.children', () => {
+  const Component = {
+    functional: true,
+    render: (h, {children}) => {
+      return h('div', children)
+    }
+  }
+  const wrapper = mount(Component, {
+    context: {
+      children: ['hello']
+    }
+  })
+  expect(wrapper.text()).to.equal('hello')
+})
 })