add basic component test for data list toolbar

__tests__/components/DataListToolbar.test.jsx

@@ -0,0 +1,57 @@
+import React from 'react';
+import { mount } from 'enzyme';
+import DataListToolbar from '../../src/components/DataListToolbar';
+
+describe('<DataListToolbar />', () => {
+  const columns = [{ name: 'Name', key: 'name', isSortable: true }];
+  const noop = () => {};
+
+  let toolbar;
+
+  afterEach(() => {
+    if (toolbar) {
+      toolbar.unmount();
+      toolbar = null;
+    }
+  });
+
+  test('it triggers the expected callbacks', () => {
+    const search = 'button[aria-label="Search"]';
+    const searchTextInput = 'input[aria-label="search text input"]';
+    const selectAll = 'input[aria-label="Select all"]';
+    const sort = 'button[aria-label="Sort"]';
+
+    const onSearch = jest.fn();
+    const onSort = jest.fn();
+    const onSelectAll = jest.fn();
+
+    toolbar = mount(
+      <DataListToolbar
+        isAllSelected={false}
+        sortedColumnKey="name"
+        sortOrder="ascending"
+        columns={columns}
+        onSearch={onSearch}
+        onSort={onSort}
+        onSelectAll={onSelectAll}
+      />
+    );
+
+    toolbar.find(sort).simulate('click');
+    toolbar.find(selectAll).simulate('change', { target: { checked: false } });
+
+    expect(onSelectAll).toHaveBeenCalledTimes(1);
+    expect(onSort).toHaveBeenCalledTimes(1);
+    expect(onSort).toBeCalledWith('name', 'descending');
+
+    expect(onSelectAll).toHaveBeenCalledTimes(1);
+    expect(onSelectAll.mock.calls[0][0]).toBe(false);
+
+    toolbar.find(searchTextInput).instance().value = 'test-321';
+    toolbar.find(searchTextInput).simulate('change');
+    toolbar.find(search).simulate('click');
+
+    expect(onSearch).toHaveBeenCalledTimes(1);
+    expect(onSearch).toBeCalledWith('test-321');
+  });
+});