Remove Obsolete Test Code

tests/unit/example.spec.js

-import { expect } from 'chai';
-import { shallowMount } from '@vue/test-utils';
-import HelloWorld from '@/components/HelloWorld.vue';
-
-describe('HelloWorld.vue', () => {
-  it('renders props.msg when passed', () => {
-    const msg = 'new message';
-    const wrapper = shallowMount(HelloWorld, {
-      propsData: { msg },
-    });
-    expect(wrapper.text()).to.include(msg);
-  });
-});