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/explore/components/DatasourceControl_spec.jsx

@@ -0,0 +1,64 @@
+/**
+ * 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 sinon from 'sinon';
+import configureStore from 'redux-mock-store';
+import { shallow } from 'enzyme';
+import DatasourceModal from '../../../../src/datasource/DatasourceModal';
+import ChangeDatasourceModal from '../../../../src/datasource/ChangeDatasourceModal';
+import DatasourceControl from '../../../../src/explore/components/controls/DatasourceControl';
+
+const defaultProps = {
+  name: 'datasource',
+  label: 'Datasource',
+  value: '1__table',
+  datasource: {
+    name: 'birth_names',
+    type: 'table',
+    uid: '1__table',
+    id: 1,
+    columns: [],
+    metrics: [],
+    database: {
+      backend: 'mysql',
+      name: 'main',
+    },
+  },
+  onChange: sinon.spy(),
+};
+
+describe('DatasourceControl', () => {
+  function setup() {
+    const mockStore = configureStore([]);
+    const store = mockStore({});
+    return shallow(<DatasourceControl {...defaultProps} />, {
+      context: { store },
+    });
+  }
+
+  it('renders a Modal', () => {
+    const wrapper = setup();
+    expect(wrapper.find(DatasourceModal)).toHaveLength(1);
+  });
+
+  it('renders a ChangeDatasourceModal', () => {
+    const wrapper = setup();
+    expect(wrapper.find(ChangeDatasourceModal)).toHaveLength(1);
+  });
+});