test: add unit test for localeNotification in workbench (#398)

src/workbench/notification/__tests__/__snapshots__/localeNotification.test.tsx.snap

@@ -0,0 +1,39 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`The LocaleNotification Component Match Snapshot 1`] = `
+<div
+  style={
+    Object {
+      "lineHeight": "1.5",
+      "textAlign": "left",
+      "width": 350,
+    }
+  }
+>
+  <p>
+    The current locale has changed to 
+    chinese
+    , click the button to reload the Page and applying the changes.
+  </p>
+  <p
+    style={
+      Object {
+        "fontWeight": "bold",
+      }
+    }
+  >
+    Notice: Reload the Page could lose the data, Please confirm you have saved before.
+  </p>
+  <a
+    className="mo-btn mo-btn--normal"
+    onClick={[Function]}
+    style={
+      Object {
+        "width": 150,
+      }
+    }
+  >
+    Confirm Reload
+  </a>
+</div>
+`;

src/workbench/notification/__tests__/localeNotification.test.tsx

@@ -0,0 +1,29 @@
+import { fireEvent, render } from '@testing-library/react';
+import React from 'react';
+import { create } from 'react-test-renderer';
+import LocaleNotification from '../notificationPane/localeNotification';
+
+describe('The LocaleNotification Component', () => {
+    test('Match Snapshot', () => {
+        const component = create(<LocaleNotification locale="chinese" />);
+        expect(component.toJSON()).toMatchSnapshot();
+    });
+
+    test('Should support to reload via button', () => {
+        const originalFunction = window.location.reload;
+        const mockFn = jest.fn();
+        Reflect.deleteProperty(window, 'location');
+        Object.defineProperty(window, 'location', {
+            writable: true,
+            value: { reload: mockFn },
+        });
+        const { getByText } = render(<LocaleNotification locale="chinese" />);
+
+        fireEvent.click(getByText('Confirm Reload'));
+
+        expect(jest.isMockFunction(window.location.reload)).toBeTruthy();
+        expect(mockFn).toBeCalled();
+
+        window.location.reload = originalFunction;
+    });
+});