[js-testing] more tests for SelectControl (#2877)

* rename spec folder

* remove special handling for viz_type control since it now uses VizTypeControl

* add test for getOptions

* linting

* add test for cwp

* linting

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

@@ -0,0 +1,44 @@
+import React from 'react';
+import { beforeEach, describe, it } from 'mocha';
+import { expect } from 'chai';
+import { shallow } from 'enzyme';
+import sinon from 'sinon';
+
+import QueryAndSaveButtons from '../../../../javascripts/explore/components/QueryAndSaveBtns';
+import Button from '../../../../javascripts/components/Button';
+
+describe('QueryAndSaveButtons', () => {
+  const defaultProps = {
+    canAdd: 'True',
+    onQuery: sinon.spy(),
+  };
+
+  // It must render
+  it('renders', () => {
+    expect(React.isValidElement(<QueryAndSaveButtons {...defaultProps} />)).to.equal(true);
+  });
+
+  // Test the output
+  describe('output', () => {
+    let wrapper;
+
+    beforeEach(() => {
+      wrapper = shallow(<QueryAndSaveButtons {...defaultProps} />);
+    });
+
+    it('renders 2 buttons', () => {
+      expect(wrapper.find(Button)).to.have.lengthOf(2);
+    });
+
+    it('renders buttons with correct text', () => {
+      expect(wrapper.find(Button).contains(' Query')).to.eql(true);
+      expect(wrapper.find(Button).contains(' Save as')).to.eql(true);
+    });
+
+    it('calls onQuery when query button is clicked', () => {
+      const queryButton = wrapper.find('.query');
+      queryButton.simulate('click');
+      expect(defaultProps.onQuery.called).to.eql(true);
+    });
+  });
+});