feat: add frontend unit test framework (#6426)

web/app/components/base/button/index.spec.tsx

@@ -0,0 +1,49 @@
+import React from 'react'
+import { cleanup, fireEvent, render } from '@testing-library/react'
+import Button from './index'
+
+afterEach(cleanup)
+// https://testing-library.com/docs/queries/about
+describe('Button text', () => {
+  test('Button text should be same as children', async () => {
+    const { getByRole, container } = render(<Button>Click me</Button>)
+    expect(getByRole('button').textContent).toBe('Click me')
+    expect(container.querySelector('button')?.textContent).toBe('Click me')
+  })
+
+  test('Loading button text should include  same as children', async () => {
+    const { getByRole } = render(<Button loading>Click me</Button>)
+    expect(getByRole('button').textContent?.includes('Loading')).toBe(true)
+  })
+})
+
+describe('Button style', () => {
+  test('Button should have default variant', async () => {
+    const { getByRole } = render(<Button>Click me</Button>)
+    expect(getByRole('button').className).toContain('btn-secondary')
+  })
+
+  test('Button should have primary variant', async () => {
+    const { getByRole } = render(<Button variant='primary'>Click me</Button>)
+    expect(getByRole('button').className).toContain('btn-primary')
+  })
+
+  test('Button should have warning variant', async () => {
+    const { getByRole } = render(<Button variant='warning'>Click me</Button>)
+    expect(getByRole('button').className).toContain('btn-warning')
+  })
+
+  test('Button disabled should have disabled variant', async () => {
+    const { getByRole } = render(<Button disabled>Click me</Button>)
+    expect(getByRole('button').className).toContain('btn-disabled')
+  })
+})
+
+describe('Button events', () => {
+  test('onClick should been call after clicked', async () => {
+    const onClick = jest.fn()
+    const { getByRole } = render(<Button onClick={onClick}>Click me</Button>)
+    fireEvent.click(getByRole('button'))
+    expect(onClick).toHaveBeenCalled()
+  })
+})