SIP-32: Moving frontend code to the base of the repo (#9098)

* move assets out, get webpack dev working

* update docs to reference superset-frontend

* draw the rest of the owl

* fix docs

* fix webpack script

* rats

* correct docs

* fix tox dox

superset-frontend/spec/javascripts/components/URLShortLinkButton_spec.jsx

@@ -0,0 +1,45 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 configureStore from 'redux-mock-store';
+import { shallow } from 'enzyme';
+
+import { OverlayTrigger } from 'react-bootstrap';
+import URLShortLinkButton from '../../../src/components/URLShortLinkButton';
+
+describe('URLShortLinkButton', () => {
+  const defaultProps = {
+    url: 'mockURL',
+    emailSubject: 'Mock Subject',
+    emailContent: 'mock content',
+  };
+
+  function setup() {
+    const mockStore = configureStore([]);
+    const store = mockStore({});
+    return shallow(<URLShortLinkButton {...defaultProps} />, {
+      context: { store },
+    }).dive();
+  }
+
+  it('renders OverlayTrigger', () => {
+    const wrapper = setup();
+    expect(wrapper.find(OverlayTrigger)).toHaveLength(1);
+  });
+});