Change shallowWrapper.text() to handle spaces same behavior as ReactW…

…rapper.text()

- remove empty nodes
- remove double spaces
- remove spaces from beginning or end
- not sure all those are all the rule, need to check
- couldn't run tests

packages/enzyme-test-suite/test/ShallowWrapper-spec.jsx

@@ -2,7 +2,7 @@ import React from 'react';
 import PropTypes from 'prop-types';
 import { expect } from 'chai';
 import sinon from 'sinon';
-import { shallow, render, ShallowWrapper } from 'enzyme';
+import { shallow, render, ShallowWrapper, mount } from 'enzyme';
 import { ITERATOR_SYMBOL, withSetStateAllowed, sym } from 'enzyme/build/Utils';
 
 import './_helpers/setupAdapters';
@@ -1633,6 +1633,28 @@ describe('shallow', () => {
       matchesRender(<div>&gt;</div>);
     });
 
+    it('should handle spaces with same behavior as ReactWarpper.text()', () => {
+      const Space = (
+        <div>
+          <div> test  </div>
+          <div>Hello
+
+
+            World</div>
+          <div>Hello World</div>
+          <div>Hello
+            World</div>
+          <div>Hello     World</div>
+          <div>&nbsp;</div>
+          <div>&nbsp;&nbsp;</div>
+        </div>
+      )
+      const wrapper = shallow(Space);
+      const mounted = mount(Space);
+      expect(wrapper.text()).to.equal(mounted.text());
+    })
+    });
+
     describeIf(!REACT013, 'stateless function components', () => {
       it('should handle nodes with mapped children', () => {
         const Foo = props => (

packages/enzyme/src/RSTTraversal.js

@@ -127,5 +127,7 @@ export function getTextFromNode(node) {
 
   return childrenOfNode(node).map(getTextFromNode)
     .join('')
-    .replace(/\s+/, ' ');
+    .replace(/^[ \t\n\r]+$/g, '') // remove empty nodes
+    .replace(/[ \t\n\r]+/, ' ') // remove double spaces
+    .replace(/(^[ \t\n\r]*|[ \t\n\r]*$)/, ''); // remove spaces from beginning or end
 }