New "Time Series - Table" visualization (#3543)

* [WiP] adding a new "Time Series - Table" viz

* Adding drag-n-drop to collection

* Using keys in arrays

* tests

superset/assets/spec/javascripts/explore/components/TimeSeriesColumnControl_spec.jsx

@@ -0,0 +1,33 @@
+/* eslint-disable no-unused-expressions */
+import React from 'react';
+import { FormControl, OverlayTrigger } from 'react-bootstrap';
+import sinon from 'sinon';
+import { expect } from 'chai';
+import { describe, it, beforeEach } from 'mocha';
+import { shallow } from 'enzyme';
+
+import TimeSeriesColumnControl from '../../../../javascripts/explore/components/controls/TimeSeriesColumnControl';
+
+const defaultProps = {
+  name: 'x_axis_label',
+  label: 'X Axis Label',
+  onChange: sinon.spy(),
+};
+
+describe('SelectControl', () => {
+  let wrapper;
+  let inst;
+  beforeEach(() => {
+    wrapper = shallow(<TimeSeriesColumnControl {...defaultProps} />);
+    inst = wrapper.instance();
+  });
+
+  it('renders an OverlayTrigger', () => {
+    expect(wrapper.find(OverlayTrigger)).to.have.lengthOf(1);
+  });
+
+  it('renders an Popover', () => {
+    const popOver = shallow(inst.renderPopover());
+    expect(popOver.find(FormControl)).to.have.lengthOf(3);
+  });
+});