test: add frontend tests for vue components

tests/frontend/unit/test_test.spec.js

@@ -0,0 +1,19 @@
+import {mount} from '@vue/test-utils'
+import {expect, test} from 'vitest'
+
+// The component to test
+const MessageComponent = {
+  template: '<p>{{ msg }}</p>',
+  props: ['msg']
+}
+
+test('displays message', () => {
+  const wrapper = mount(MessageComponent, {
+    props: {
+      msg: 'Hello world'
+    }
+  })
+
+  // Assert the rendered text of the component
+  expect(wrapper.text()).toContain('Hello world')
+})