Introduce selection.setClipboardData() in assert_selection()

third_party/WebKit/LayoutTests/editing/assert_selection.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 'use strict';
 
 // This file provides |assert_selection(sample, tester, expectedText)| assertion
 // to W3C test harness to write editing test cases easier.
 //
 // |sample| is an HTML fragment text which is inserted as |innerHTML|. It should
@@ skipping 490 matching lines @@
    */
   serializeInternal(node) {
     if (isElement(node))
       return this.handleElementNode(node);
     if (isCharacterData(node))
       return this.handleCharacterData(node);
     throw new Error(`Unexpected node ${node}`);
   }
 }
 
+/**
+ * @this {!DOMSelection}
+ * @param {string} html
+ * @param {string=} opt_text
+ */
+function setClipboardData(html, opt_text) {
+  assert_not_equals(window.internals, undefined,
+    'This test requests clipboard access from JavaScript.');
+  function computeTextData() {
+    if (opt_text !== undefined)
+      return opt_text;
+    const element = document.createElement('div');
+    element.innerHTML = html;
+    return element.textContent;
+  }
+  function copyHandler(event) {
+    const clipboardData = event.clipboardData;
+    clipboardData.setData('text/plain', computeTextData());
+    clipboardData.setData('text/html', html);
+    event.preventDefault();
+  }
+  document.addEventListener('copy', copyHandler);
+  document.execCommand('copy');
+  document.removeEventListener('copy', copyHandler);
+}
+
 class Sample {
   /**
    * @public
    * @param {string} sampleText
    */
   constructor(sampleText) {
     /** @const @type {!HTMLIFame} */
     this.iframe_ = document.createElement('iframe');
     if (!document.body)
         document.body = document.createElement("body");
     document.body.appendChild(this.iframe_);
     /** @const @type {!HTMLDocument} */
     this.document_ = this.iframe_.contentDocument;
     /** @const @type {!Selection} */
     this.selection_ = this.iframe_.contentWindow.getSelection();
     this.selection_.document = this.document_;
     this.selection_.document.offsetLeft = this.iframe_.offsetLeft;
     this.selection_.document.offsetTop = this.iframe_.offsetTop;
+    this.selection_.setClipboardData = setClipboardData;
 
     this.load(sampleText);
   }
 
   /** @return {!HTMLDocument} */
   get document() { return this.document_; }
 
   /** @return {!Selection} */
   get selection() { return this.selection_; }
 
@@ skipping 141 matching lines @@
   throw new Error(`${description}\n` +
     `\t expected ${expectedText},\n` +
     `\t but got  ${actualText},\n` +
     `\t sameupto ${commonPrefixOf(expectedText, actualText)}`);
 }
 
 // Export symbols
 window.Sample = Sample;
 window.assert_selection = assertSelection;
 })();