Add test case for LocalProvider (#4693)

components/locale-provider/__tests__/index.test.js

+import React from 'react';
+import { mount } from 'enzyme';
+import moment from 'moment';
+import { LocaleProvider, Pagination, DatePicker, TimePicker, Calendar,
+         Popconfirm, Table, Modal, Select, Transfer } from '../../';
+import enUS from '../en_US';
+import ptBR from '../pt_BR';
+import ruRU from '../ru_RU';
+import esES from '../es_ES';
+
+const Option = Select.Option;
+const RangePicker = DatePicker.RangePicker;
+
+const columns = [{
+  title: 'Name',
+  dataIndex: 'name',
+  filters: [{
+    text: 'filter1',
+    value: 'filter1',
+  }],
+}, {
+  title: 'Age',
+  dataIndex: 'age',
+}];
+
+const App = () => (
+  <div>
+    <Pagination defaultCurrent={1} total={50} showSizeChanger />
+    <Select showSearch style={{ width: 200 }}>
+      <Option value="jack">jack</Option>
+      <Option value="lucy">lucy</Option>
+    </Select>
+    <DatePicker />
+    <TimePicker />
+    <RangePicker style={{ width: 200 }} />
+    <Popconfirm title="Question?" visible>
+      <a>Click to confirm</a>
+    </Popconfirm>
+    <Transfer
+      dataSource={[]}
+      showSearch
+      targetKeys={[]}
+      render={item => item.title}
+    />
+    <Calendar fullscreen={false} value={moment()} />
+    <Table dataSource={[]} columns={columns} />
+    <Modal title="Locale Modal" visible>
+      <p>Locale Modal</p>
+    </Modal>
+  </div>
+);
+
+describe('Locale Provider', () => {
+  it('should display the text as locale changed', () => {
+    [enUS, ptBR, ruRU, esES].forEach((locale) => {
+      const wrapper = mount(
+        <LocaleProvider locale={locale}>
+          <App />
+        </LocaleProvider>
+      );
+      const DatePickerPlaceholder = wrapper.find('.ant-calendar-picker-input').at(0).node.getAttribute('placeholder');
+      expect(DatePickerPlaceholder).toBe(locale.DatePicker.lang.placeholder);
+    });
+  });
+});

components/pagination/locale/en_US.tsx

-import en_US from 'rc-pagination/lib/locale/en_US';
-export default en_US;