ExternalLinks component test

Signed-off-by: Ruben Vargas <ruben.vp8510@gmail.com>

packages/jaeger-ui/src/components/common/ExternalLinks.test.js

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+// Copyright (c) 2017 Uber Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import React from 'react';
+import { shallow, mount } from 'enzyme';
+import ExternalLinks from './ExternalLinks';
+
+describe('<ExternalLinks>', () => {
+  describe('render  links links', () => {
+    it('renders dropdown with multiple links', () => {
+      const links = [
+        { url: 'http://nowhere/', text: 'some text' },
+        { url: 'http://other/', text: 'other text' },
+        { url: 'http://link/', text: 'link text' },
+      ];
+
+      const wrapper = shallow(<ExternalLinks links={links} />);
+      const dropdown = wrapper.find('Dropdown');
+      expect(dropdown.length).toBe(1);
+    });
+
+    it('renders one link', () => {
+      const links = [{ url: 'http://nowhere/', text: 'some text' }];
+      const wrapper = shallow(<ExternalLinks links={links} />);
+      const dropdown = wrapper.find('Dropdown');
+      expect(dropdown.length).toBe(0);
+      expect(wrapper.find('LinkValue').length).toBe(1);
+    });
+  });
+
+  it('is fine when mounted', () => {
+    const links = [{ url: 'http://nowhere/', text: 'some text' }];
+    const wrapper = mount(<ExternalLinks links={links} />);
+    expect(wrapper).toBeDefined();
+  });
+});