Mostly set up

tests/unit/.eslintrc.js

@@ -0,0 +1,5 @@
+module.exports = {
+  env: {
+    jest: true
+  }
+};

tests/unit/example.spec.js

@@ -0,0 +1,12 @@
+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()).toMatch(msg);
+  });
+});