created tests for components related to importing from source

web/src/components/__tests__/AnswerSource.test.js

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+import React from 'react';
+import {Button} from 'react-md';
+import {shallow, mount} from 'enzyme';
+import AnswerSource from '../AnswerSource';
+import {ANSWER_TYPE} from '../../config/constants'
+
+it ('renders without crashing', () => {
+  shallow (<AnswerSource />);
+});
+
+
+describe('functional tests', ()=>{
+  let wrapper;
+  beforeEach(()=>{
+    const onSaveAnswerTypeFunction = jest.fn();
+    wrapper = mount(<AnswerSource onSaveAnswerType={onSaveAnswerTypeFunction} />);
+    wrapper.setState({
+      isModalOpen: false,
+      answerType: 0
+    });
+  });
+
+  it ('renders only a button', () => {
+    expect(wrapper.first().text()).toEqual('Answer type');
+    expect(wrapper.find('AnswerSourceForm').exists()).toEqual(false);
+  });
+
+  it('answer type button click opens modal form', () => {
+    expect(wrapper.find('AnswerSourceFormA').exists()).toEqual(false);
+    expect(wrapper.state().isModalOpen).toEqual(false);
+    const AnswerTypeButton = wrapper.find('button').first();
+    AnswerTypeButton.simulate('click');
+    expect(wrapper.state().isModalOpen).toEqual(true);
+    expect(wrapper.find('AnswerSourceForm').exists()).toEqual(true);
+    expect(wrapper.find('button').length).toBe(3);
+    expect(wrapper.find('button').first().text()).toEqual('Answer type');
+  });
+
+  it('save button changes answerType value in state and closes the form ', () => {
+    const AnswerTypeButton = wrapper.find('button').first();
+    AnswerTypeButton.simulate('click');
+    const saveButton = wrapper.find('button').at(2);
+    const optionControl = wrapper.find('SelectionControlGroup');
+    expect(saveButton.text()).toEqual('Save');
+    expect(optionControl.exists()).toEqual(true);
+    optionControl.simulate('change',{target:{value:String(ANSWER_TYPE.EXTERNAL_SOURCE_WP_NEWS)}});
+    saveButton.simulate('click');
+    expect(wrapper.state().answerType).toBe(ANSWER_TYPE.EXTERNAL_SOURCE_WP_NEWS)
+    expect(wrapper.state().isModalOpen).toEqual(false);
+    expect(wrapper.find('button').length).toBe(1);
+  });
+});