[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/EmbedCodeButton_spec.jsx

@@ -0,0 +1,47 @@
+import React from 'react';
+import { expect } from 'chai';
+import { describe, it } from 'mocha';
+import { shallow, mount } from 'enzyme';
+import { OverlayTrigger } from 'react-bootstrap';
+
+import EmbedCodeButton from '../../../../javascripts/explore/components/EmbedCodeButton';
+
+describe('EmbedCodeButton', () => {
+  const defaultProps = {
+    slice: {
+      data: {
+        standalone_endpoint: 'endpoint_url',
+      },
+    },
+  };
+
+  it('renders', () => {
+    expect(React.isValidElement(<EmbedCodeButton {...defaultProps} />)).to.equal(true);
+  });
+
+  it('renders overlay trigger', () => {
+    const wrapper = shallow(<EmbedCodeButton {...defaultProps} />);
+    expect(wrapper.find(OverlayTrigger)).to.have.length(1);
+  });
+
+  it('returns correct embed code', () => {
+    const wrapper = mount(<EmbedCodeButton {...defaultProps} />);
+    wrapper.setState({
+      height: '1000',
+      width: '2000',
+      srcLink: 'http://localhost/endpoint_url',
+    });
+    const embedHTML = (
+      '<iframe\n' +
+      '  width="2000"\n' +
+      '  height="1000"\n' +
+      '  seamless\n' +
+      '  frameBorder="0"\n' +
+      '  scrolling="no"\n' +
+      '  src="nullendpoint_url&height=1000"\n' +
+      '>\n' +
+      '</iframe>'
+    );
+    expect(wrapper.instance().generateEmbedHTML()).to.equal(embedHTML);
+  });
+});