Hi there,

I'm having issues with Karma/Webpack I think, I'm getting a warning when mounting a component like this:

importHelloInjectorfrom'!!vue-loader?inject!./../../../src/components/Hello.vue';constgetComponentWithMockedHttp=get=>HelloInjector({'./../modules/http':{        get}});constcomponent=getComponentWithMockedHttp(()=>newPromise(resolve=>resolve('All fine here')));constvm=newVue(component).$mount();vm.helloMethod().then(message=>{expect(vm.message).toEqual(message);expect(vm.message).toBe('All fine here');expect(vm.computedMessage).toBe('All fine here!!!');done();});

There I get a warning (and a failure also) on the computed property but only if such property is in the parent class. If I move the computed property in the child class everything works fine and I get no warnings. Also it happens only when running my specs through Karma/Webpack, I don't get any warning when running it through thewebpack-dev-server.

I committed the whole thinghere. In thispull request you can see how the error goes away by just moving the computed property from the parent class into the child one.

Steps to reproduce:

1. make dbuild (it builds the docker image on top ofnode:slim)
2. make install (runs an npm install mounting the volume so you getnode_modules in the host)
3. make test (runs karma with Chrome headless)

To run it in your browser instead just domake run and go tolocalhost:8080.

What am I missing?