smart-paste-003-trailing-whitespace.html

<html> 
<head>
<script src=../editing.js language="JavaScript" type="text/JavaScript" ></script>
<script>
function editingTest() {
    // Select "hello "
    window.getSelection().setBaseAndExtent(test.firstChild, 0, test.firstChild, 7);
    copyCommand();
    moveSelectionForwardByCharacterCommand();
    pasteCommand();
    // Avoid printing nbsp
    test.innerHTML = "";
}
</script>
<title>Editing Test</title> 
</head> 
<body>
<h1>Smart paste when pasting a word with trailing whitespace after a word and a space before another word.</h1>
<p>To run this test manually, select "hello " (including trailing space), copy, and paste.</p>

<h2>Expected result</h2>
<p>A space should be added between the preexisting word and the word that's pasted.
No space should be added after the pasted word: <code>hello hello world</code></p>

<h2>Actual result</h2>
<div contenteditable id="root">
<div id="test" class="editing" style="font-size: 24px;">
hello world
</div>
</div>
<script>
runDumpAsTextEditingTest();
</script>
</body>
</html>

chromium/third_party/blink/web_tests/editing/pasteboard/smart-paste-003-trailing-whitespace.html