🤡 test: add HelloWorld.test.ts

Author: hisasann

src/test/HelloWorld.test.ts

@@ -0,0 +1,17 @@
+import { mount, shallowMount } from '@vue/test-utils'
+import HelloWorld from '@/components/HelloWorld.vue'
+
+describe('HelloWorld', (): void => {
+  test('is a Vue instance', (): void => {
+    const wrapper = mount(HelloWorld)
+    expect(wrapper.isVueInstance()).toBeTruthy()
+  })
+
+  test('renders props.message when passed', () => {
+    const message = 'new message'
+    const wrapper = shallowMount(HelloWorld, {
+      propsData: { message }
+    })
+    expect(wrapper.text()).toMatch(message)
+  })
+})