Add test for FormGuideline component

frontend/test/unit/components/tasks/toolbar/forms/formGuideline.spec.js

@@ -0,0 +1,23 @@
+/**
+ * @jest-environment jsdom
+ */
+import { mount } from '@vue/test-utils'
+import FormGuideline from '@/components/tasks/toolbar/forms/FormGuideline'
+
+const $t = () => {}
+
+const factory = (values = {}) => {
+  return mount(FormGuideline, {
+    propsData: {
+      guidelineText: 'Hello'
+    },
+    mocks:{ $t }
+  })
+}
+
+describe('Foo', () => {
+  it('welcome メッセージを描画する', () => {
+    const wrapper = factory()
+    expect(wrapper.find('.tui-editor-contents').text()).toEqual('Hello')
+  })
+})