[Telemetry] Add script to snapshot page's HTML

telemetry/third_party/snap-it/tests/tests.js

Index: telemetry/third_party/snap-it/tests/tests.js
diff --git a/telemetry/third_party/snap-it/tests/tests.js b/telemetry/third_party/snap-it/tests/tests.js
new file mode 100644
index 0000000000000000000000000000000000000000..1cd11daacdd396b83be5de309eea591a85acd95f
--- /dev/null
+++ b/telemetry/third_party/snap-it/tests/tests.js
@@ -0,0 +1,842 @@
+QUnit.test('windowDepth: no parent window', function(assert) {
+  var serializer = new HTMLSerializer();
+  assert.equal(serializer.windowDepth(window), 0);
+});
+
+QUnit.test('windowDepth: multiple parent windows', function(assert) {
+  var serializer = new HTMLSerializer();
+  var fixture = document.getElementById('qunit-fixture');
+  var childFrame = document.createElement('iframe');
+  fixture.appendChild(childFrame);
+  var childFrameBody = childFrame.contentDocument.body;
+  var grandChildFrame = document.createElement('iframe');
+  childFrameBody.appendChild(grandChildFrame);
+  assert.equal(serializer.windowDepth(childFrame.contentWindow), 1);
+  assert.equal(serializer.windowDepth(grandChildFrame.contentWindow), 2);
+});
+
+QUnit.test('escapedCharacter: zero depth', function(assert) {
+  var serializer = new HTMLSerializer();
+  assert.equal(serializer.escapedCharacter('"', 0), '"');
+  assert.equal(serializer.escapedCharacter("'", 0), "'");
+  assert.equal(serializer.escapedCharacter('<', 0), '<');
+  assert.equal(serializer.escapedCharacter('>', 0), '>');
+  assert.equal(serializer.escapedCharacter('&', 0), '&');
+});
+
+QUnit.test('escapedCharacter: nonzero depth', function(assert) {
+  var serializer = new HTMLSerializer();
+  assert.equal(serializer.escapedCharacter('"', 1), '&quot;');
+  assert.equal(serializer.escapedCharacter('"', 2), '&amp;quot;');
+  assert.equal(serializer.escapedCharacter("'", 1), '&#39;');
+  assert.equal(serializer.escapedCharacter("'", 2), '&amp;#39;');
+  assert.equal(serializer.escapedCharacter('<', 1), '&lt;');
+  assert.equal(serializer.escapedCharacter('<', 2), '&amp;lt;');
+  assert.equal(serializer.escapedCharacter('>', 1), '&gt;');
+  assert.equal(serializer.escapedCharacter('>', 2), '&amp;gt;');
+  assert.equal(serializer.escapedCharacter('&', 1), '&amp;');
+  assert.equal(serializer.escapedCharacter('&', 2), '&amp;amp;');
+});
+
+QUnit.test('iframeIndex: single layer', function(assert) {
+  var serializer = new HTMLSerializer();
+  var fixture = document.getElementById('qunit-fixture');
+  var childFrame1 = document.createElement('iframe');
+  var childFrame2 = document.createElement('iframe');
+  fixture.appendChild(childFrame1);
+  fixture.appendChild(childFrame2);
+  assert.equal(serializer.iframeIndex(window), -1);
+  assert.equal(serializer.iframeIndex(childFrame1.contentWindow), 0);
+  assert.equal(serializer.iframeIndex(childFrame2.contentWindow), 1);
+});
+
+QUnit.test('iframeIndex: multiple layers', function(assert) {
+  var serializer = new HTMLSerializer();
+  var fixture = document.getElementById('qunit-fixture');
+  var childFrame = document.createElement('iframe');
+  var grandChildFrame1 = document.createElement('iframe');
+  var grandChildFrame2 = document.createElement('iframe');
+  fixture.appendChild(childFrame);
+  var childFrameBody = childFrame.contentDocument.body;
+  childFrameBody.appendChild(grandChildFrame1);
+  childFrameBody.appendChild(grandChildFrame2);
+  assert.equal(serializer.iframeIndex(grandChildFrame1.contentWindow), 0);
+  assert.equal(serializer.iframeIndex(grandChildFrame2.contentWindow), 1);
+});
+
+QUnit.test('iframeFullyQualifiedName: single layer', function(assert) {
+  var serializer = new HTMLSerializer();
+  var fixture = document.getElementById('qunit-fixture');
+  var childFrame1 = document.createElement('iframe');
+  var childFrame2 = document.createElement('iframe');
+  fixture.appendChild(childFrame1);
+  fixture.appendChild(childFrame2);
+  assert.equal(serializer.iframeFullyQualifiedName(window), '0');
+  assert.equal(
+      serializer.iframeFullyQualifiedName(childFrame1.contentWindow),
+      '0.0');
+  assert.equal(
+      serializer.iframeFullyQualifiedName(childFrame2.contentWindow),
+      '0.1');
+});
+
+QUnit.test('iframeFullyQualifiedName: multiple layers', function(assert) {
+  var serializer = new HTMLSerializer();
+  var fixture = document.getElementById('qunit-fixture');
+  var childFrame = document.createElement('iframe');
+  var grandChildFrame1 = document.createElement('iframe');
+  var grandChildFrame2 = document.createElement('iframe');
+  fixture.appendChild(childFrame);
+  var childFrameBody = childFrame.contentDocument.body;
+  childFrameBody.appendChild(grandChildFrame1);
+  childFrameBody.appendChild(grandChildFrame2);
+  assert.equal(
+      serializer.iframeFullyQualifiedName(grandChildFrame1.contentWindow),
+      '0.0.0');
+  assert.equal(
+      serializer.iframeFullyQualifiedName(grandChildFrame2.contentWindow),
+      '0.0.1');
+});
+
+QUnit.test('processSimpleAttribute: top window', function(assert) {
+  var serializer = new HTMLSerializer();
+  var fixture = document.getElementById('qunit-fixture');
+  var win = fixture.ownerDocument.defaultView;
+  serializer.processSimpleAttribute(win, 'height', '5');
+  assert.equal(serializer.html[0], 'height="5" ');
+});
+
+QUnit.test('processSimpleAttribute: nested window', function(assert) {
+  var serializer = new HTMLSerializer();
+  var fixture = document.getElementById('qunit-fixture');
+  var childFrame = document.createElement('iframe');
+  var grandChildFrame = document.createElement('iframe');
+  fixture.appendChild(childFrame);
+  var childFrameBody = childFrame.contentDocument.body;
+  childFrameBody.appendChild(grandChildFrame);
+  var childFrameWindow = childFrame.contentDocument.defaultView;
+  var grandChildFrameWindow = grandChildFrame.contentDocument.defaultView;
+  serializer.processSimpleAttribute(childFrameWindow, 'height', '5');
+  serializer.processSimpleAttribute(grandChildFrameWindow, 'width', '2');
+  assert.equal(serializer.html[0], 'height=&quot;5&quot; ');
+  assert.equal(serializer.html[1], 'width=&amp;quot;2&amp;quot; ');
+});
+
+QUnit.test('processHoleAttribute: top window', function(assert) {
+  var serializer = new HTMLSerializer();
+  var fixture = document.getElementById('qunit-fixture');
+  var win = fixture.ownerDocument.defaultView;
+  var valueIndex = serializer.processHoleAttribute(win, 'height');
+  assert.equal(valueIndex, 1);
+  assert.equal(serializer.html[0], 'height="');
+  assert.equal(serializer.html[2], '" ');
+});
+
+QUnit.test('processHoleAttribute: nested window', function(assert) {
+  var serializer = new HTMLSerializer();
+  var fixture = document.getElementById('qunit-fixture');
+  var childFrame = document.createElement('iframe');
+  var grandChildFrame = document.createElement('iframe');
+  fixture.appendChild(childFrame);
+  var childFrameBody = childFrame.contentDocument.body;
+  childFrameBody.appendChild(grandChildFrame);
+  var childFrameWindow = childFrame.contentDocument.defaultView;
+  var grandChildFrameWindow = grandChildFrame.contentDocument.defaultView;
+  var childValueIndex = serializer.processHoleAttribute(
+      childFrameWindow,
+      'height');
+  var grandChildValueIndex = serializer.processHoleAttribute(
+      grandChildFrameWindow,
+      'width');
+  assert.equal(childValueIndex, 1);
+  assert.equal(serializer.html[0], 'height=&quot;');
+  assert.equal(serializer.html[2], '&quot; ');
+  assert.equal(grandChildValueIndex, 4);
+  assert.equal(serializer.html[3], 'width=&amp;quot;');
+  assert.equal(serializer.html[5], '&amp;quot; ');
+});
+
+QUnit.test('fullyQualifiedURL', function(assert) {
+  var serializer = new HTMLSerializer();
+  var iframe = document.createElement('iframe');
+  iframe.setAttribute('src', 'page.html');
+  var url = serializer.fullyQualifiedURL(iframe);
+  var href = window.location.href;
+  var path = href.slice(0, href.lastIndexOf('/'));
+  assert.equal(path + '/page.html', url.href);
+});
+
+QUnit.test('processSrcHole: top window', function(assert) {
+  var serializer = new HTMLSerializer();
+  var iframe = document.createElement('iframe');
+  iframe.setAttribute('src', 'tests.html');
+  serializer.processSrcHole(iframe);
+  assert.equal(serializer.html[0], 'src="');
+  assert.equal(serializer.html[1], '');
+  assert.equal(serializer.html[2], '" ');
+  assert.equal(serializer.srcHoles[1], window.location.href);
+  assert.equal(Object.keys(serializer.srcHoles).length, 1);
+});
+
+QUnit.test('processSrcAttribute: iframe', function(assert) {
+  var serializer = new HTMLSerializer();
+  var iframe = document.createElement('iframe');
+  iframe.setAttribute('src', 'tests.html');
+  serializer.processSrcAttribute(iframe);
+  assert.equal(serializer.html.length, 0);
+  assert.equal(Object.keys(serializer.srcHoles).length, 0);
+});
+
+QUnit.test('processSrcAttribute: audio', function(assert) {
+  var serializer = new HTMLSerializer();
+  var audio = document.createElement('audio');
+  audio.setAttribute('src', 'tests.html');
+  serializer.processSrcAttribute(audio);
+  assert.equal(serializer.html[0], `src="${window.location.href}" `);
+  assert.equal(serializer.html.length, 1);
+  assert.equal(Object.keys(serializer.srcHoles).length, 0);
+});
+
+QUnit.test('processSrcAttribute: img', function(assert) {
+  var serializer = new HTMLSerializer();
+  var img = document.createElement('img');
+  img.setAttribute('src', 'tests.html');
+  serializer.processSrcAttribute(img);
+  assert.equal(serializer.html[0], 'src="');
+  assert.equal(serializer.html[1], '');
+  assert.equal(serializer.html[2], '" ');
+  assert.equal(serializer.srcHoles[1], window.location.href);
+  assert.equal(Object.keys(serializer.srcHoles).length, 1);
+});
+
+QUnit.test('processTree: single node', function(assert) {
+  var fixture = document.getElementById('qunit-fixture');
+  var node = document.createElement('div');
+  node.appendChild(document.createTextNode('test'));
+  fixture.appendChild(node);
+  var serializer = new HTMLSerializer();
+  serializer.processTree(node);
+  assert.equal(Object.keys(serializer.srcHoles).length, 0);
+  assert.equal(Object.keys(serializer.frameHoles).length, 0);
+});
+
+QUnit.test('HTMLSerializer class loaded twice', function(assert) {
+  assert.expect(0);
+  var done = assert.async();
+  var fixture = document.getElementById('qunit-fixture');
+  var script1 = document.createElement('script');
+  var script2 = document.createElement('script');
+  script1.setAttribute('src', '../HTMLSerializer.js');
+  script2.setAttribute('src', '../HTMLSerializer.js');
+  fixture.appendChild(script1);
+  fixture.appendChild(script2);
+  setTimeout(function() {
+    done();
+  }, 0);
+});
+
+QUnit.test('processTree: no closing tag', function(assert) {
+  var serializer = new HTMLSerializer();
+  var img = document.createElement('img');
+  serializer.processTree(img);
+  assert.equal(serializer.html[0], '<img ');
+  assert.equal(
+      serializer.html[1],
+      `style="${window.getComputedStyle(img, null).cssText}" `);
+  assert.equal(serializer.html[3], '>')
+  assert.equal(serializer.html.length, 4);
+});
+
+QUnit.test('processTree: closing tag', function(assert) {
+  var serializer = new HTMLSerializer();
+  var p = document.createElement('p');
+  serializer.processTree(p);
+  assert.equal(serializer.html[0], '<p ');
+  assert.equal(
+      serializer.html[1],
+      `style="${window.getComputedStyle(p, null).cssText}" `);
+  assert.equal(serializer.html[3], '>');
+  assert.equal(serializer.html[4], '</p>');
+  assert.equal(serializer.html.length, 5);
+});
+
+QUnit.test(
+  'processAttributes: img with height and width attributes',
+  function(assert) {
+    var serializer = new HTMLSerializer();
+    var fixture = document.getElementById('qunit-fixture');
+    var img = document.createElement('img');
+    img.setAttribute('height', 5);
+    img.setAttribute('width', 5);
+    fixture.appendChild(img);
+    serializer.processAttributes(img, 'id');
+    var styleText = serializer.html[0];
+    assert.ok(styleText.includes(' height: 5px;'));
+    assert.ok(styleText.includes(' width: 5px;'));
+  }
+);
+
+QUnit.test(
+  'processAttributes: img without height and width attributes',
+  function(assert) {
+    var serializer = new HTMLSerializer();
+    var fixture = document.getElementById('qunit-fixture');
+    var img = document.createElement('img');
+    fixture.appendChild(img);
+    var style = window.getComputedStyle(img, null);
+    serializer.processAttributes(img, 'id');
+    var styleText = serializer.html[0];
+    assert.ok(styleText.includes(` height: ${style.height};`));
+    assert.ok(styleText.includes(` width: ${style.width};`));
+  }
+);
+
+QUnit.test(
+  'processAttributes: img with height and width attributes and inline style',
+  function(assert) {
+    var serializer = new HTMLSerializer();
+    var fixture = document.getElementById('qunit-fixture');
+    var img = document.createElement('img');
+    img.setAttribute('height', 5);
+    img.setAttribute('width', 5);
+    img.setAttribute('style', 'height: 10px; width: 10px;');
+    fixture.appendChild(img);
+    serializer.processAttributes(img, 'id');
+    var styleText = serializer.html[0];
+    assert.ok(styleText.includes(' height: 10px;'));
+    assert.ok(styleText.includes(' width: 10px;'));
+    assert.notOk(styleText.includes(' height: 5px;'));
+    assert.notOk(styleText.includes(' width: 5px;'));
+  }
+);
+
+QUnit.test('processText: simple text node', function(assert) {
+  var serializer = new HTMLSerializer();
+  var fixture = document.getElementById('qunit-fixture');
+  var node = document.createTextNode('Simple text');
+  fixture.appendChild(node);
+  serializer.processText(node);
+  assert.equal(serializer.html[0], 'Simple text');
+});
+
+QUnit.test('processText: escaped characters', function(assert) {
+  var serializer = new HTMLSerializer();
+  var fixture = document.getElementById('qunit-fixture');
+  var node = document.createTextNode(`<div> with '&"`);
+  fixture.appendChild(node);
+  serializer.processText(node);
+  assert.equal(
+      serializer.html[0],
+      '&lt;div&gt; with &#39;&amp;&quot;');
+});
+
+QUnit.test('processText: nested escaped characters', function(assert) {
+  var serializer = new HTMLSerializer();
+  var fixture = document.getElementById('qunit-fixture');
+  var childFrame = document.createElement('iframe');
+  var grandChildFrame = document.createElement('iframe');
+  fixture.appendChild(childFrame);
+  var childFrameBody = childFrame.contentDocument.body;
+  childFrameBody.appendChild(grandChildFrame);
+  var grandChildFrameBody = grandChildFrame.contentDocument.body;
+  var node1 = document.createTextNode(`<div> with '&"`);
+  var node2 = document.createTextNode(`<div> with '&"`);
+  childFrameBody.appendChild(node1);
+  grandChildFrameBody.appendChild(node2);
+  serializer.processText(node1);
+  serializer.processText(node2);
+  assert.equal(
+      serializer.html[0],
+      '&amp;lt;div&amp;gt; with &amp;#39;&amp;amp;&amp;quot;');
+  assert.equal(
+      serializer.html[1],
+      '&amp;amp;lt;div&amp;amp;gt; with &amp;amp;#39;&amp;amp;amp;&amp;amp;quot;');
+});
+
+QUnit.test('processPseudoElements', function(assert) {
+  var serializer = new HTMLSerializer();
+  var fixture = document.getElementById('qunit-fixture');
+  var element = document.createElement('div');
+  var style = document.createElement('style');
+  style.appendChild(document.createTextNode('div::before{content:"test";}'));
+  fixture.appendChild(style);
+  fixture.appendChild(element);
+  serializer.processPseudoElements(element, 'myId');
+  var styleText = window.getComputedStyle(element, ':before').cssText;
+  assert.equal(serializer.pseudoElementCSS.length, 1);
+  assert.equal(serializer.pseudoElementCSS[0], `#myId::before{${styleText}} `);
+});
+
+QUnit.test('processTree: element without id', function(assert) {
+  var serializer = new HTMLSerializer();
+  var fixture = document.getElementById('qunit-fixture');
+  var element = document.createElement('div');
+  fixture.appendChild(element);
+  serializer.processTree(element);
+  assert.equal(serializer.html[0], '<div ');
+  assert.equal(serializer.html[2], 'id="snap-it0" ');
+  assert.equal(serializer.html[3], '>');
+});
+
+QUnit.test('processTree: element with id', function(assert) {
+  var serializer = new HTMLSerializer();
+  var fixture = document.getElementById('qunit-fixture');
+  var element = document.createElement('div');
+  element.setAttribute('id', 'myId');
+  fixture.appendChild(element);
+  serializer.processTree(element);
+  assert.equal(serializer.html[0], '<div ');
+  assert.equal(serializer.html[2], 'id="myId" ');
+  assert.equal(serializer.html[3], '>');
+});
+
+QUnit.test('processTree: generated id exists', function(assert) {
+  var serializer = new HTMLSerializer();
+  var fixture = document.getElementById('qunit-fixture');
+  var span = document.createElement('span');
+  span.setAttribute('id', 'snap-it0');
+  fixture.appendChild(span);
+  var element = document.createElement('div');
+  fixture.appendChild(element);
+  serializer.processTree(element);
+  assert.equal(serializer.html[0], '<div ');
+  assert.equal(serializer.html[2], 'id="snap-it1" ');
+  assert.equal(serializer.html[3], '>');
+});
+
+QUnit.test('generateIdGenerator', function(assert) {
+  var serializer = new HTMLSerializer();
+  var fixture = document.getElementById('qunit-fixture');
+  var div = document.createElement('div');
+  fixture.appendChild(div);
+  var generateId = serializer.generateIdGenerator();
+  assert.equal(generateId(document), 'snap-it0');
+  assert.equal(generateId(document), 'snap-it1');
+  div.setAttribute('id', 'snap-it2');
+  assert.equal(generateId(document), 'snap-it3');
+});
+
+QUnit.test('escapedUnicodeString: html', function(assert) {
+  var serializer = new HTMLSerializer();
+  var fixture = document.getElementById('qunit-fixture');
+  var div = document.createElement('div');
+  div.appendChild(document.createTextNode('i \u2665 \u0073f'));
+  var string = div.childNodes[0].textContent;
+  assert.equal(
+      serializer.escapedUnicodeString(string, serializer.INPUT_TEXT_TYPE.HTML),
+      'i &#9829; sf');
+});
+
+QUnit.test('escapedUnicodeString: css', function(assert) {
+  var serializer = new HTMLSerializer();
+  var fixture = document.getElementById('qunit-fixture');
+  var div = document.createElement('div');
+  div.appendChild(document.createTextNode('i \u2665 \u0073f'));
+  var string = div.childNodes[0].textContent;
+  assert.equal(
+      serializer.escapedUnicodeString(string, serializer.INPUT_TEXT_TYPE.CSS),
+      'i \\2665 sf');
+});
+
+QUnit.test('fullyQualifiedFontURL', function(assert) {
+  var serializer = new HTMLSerializer();
+  var href = 'http://www.example.com/path/page/';
+  var url1 = '/hello/world/';
+  assert.equal(
+      serializer.fullyQualifiedFontURL(href, url1),
+      'http://www.example.com/hello/world/');
+  var url2 = './hello/world/';
+  assert.equal(
+      serializer.fullyQualifiedFontURL(href, url2),
+      'http://www.example.com/path/./hello/world/');
+  var url3 = '../hello/world/';
+  assert.equal(
+      serializer.fullyQualifiedFontURL(href, url3),
+      'http://www.example.com/path/../hello/world/');
+  var url4 = 'http://www.google.com/';
+  assert.equal(
+      serializer.fullyQualifiedFontURL(href, url4),
+      'http://www.google.com/');
+  var url5 = 'hello/world/';
+  assert.equal(
+      serializer.fullyQualifiedFontURL(href, url5),
+      'http://www.example.com/path/hello/world/');
+});
+
+QUnit.test('processCSSFonts: no line breaks in declaration', function(assert) {
+  var serializer = new HTMLSerializer();
+  var cssText = 'body{color:red;}' +
+      '@font-face{font-family:Font;src:url("/hello/")}';
+  var href = 'http://www.example.com/';
+  serializer.processCSSFonts(window, href, cssText);
+  assert.equal(
+      serializer.fontCSS[0],
+      '@font-face{font-family:Font;src:url("http://www.example.com/hello/")}');
+});
+
+QUnit.test('processCSSFonts: line breaks in declaration', function(assert) {
+  var serializer = new HTMLSerializer();
+  var cssText = 'body{color:red;}' +
+      '@font-face { font-family:Font;\nsrc:url("/goodbye/")}';
+  var href = 'http://www.url.com/';
+  serializer.processCSSFonts(window, href, cssText);
+  assert.equal(
+      serializer.fontCSS[0],
+      '@font-face { font-family:Font;\nsrc:url("http://www.url.com/goodbye/")}');
+});
+
+QUnit.test('loadFonts', function(assert) {
+  var serializer = new HTMLSerializer();
+  serializer.loadFonts(document);
+  assert.equal(serializer.html[0], '');
+  assert.equal(serializer.fontPlaceHolderIndex, 0);
+  assert.equal(
+      serializer.crossOriginStyleSheets[0],
+      'https://code.jquery.com/qunit/qunit-2.0.0.css');
+});
+
+QUnit.test('escapedCharacterString', function(assert) {
+  var serializer =  new HTMLSerializer();
+  var str = serializer.escapedCharacterString(`hello &>'<& "`, 2);
+  assert.equal(
+      str,
+      'hello &amp;amp;&amp;gt;&amp;#39;&amp;lt;&amp;amp; &amp;quot;');
+});
+
+QUnit.test('unescapeHTML', function(assert) {
+  var html = '&amp;lt;div&amp;gt;&amp;lt;/div&amp;gt;';
+  var unescapedHTML = unescapeHTML(html, 2);
+  assert.equal(unescapedHTML, '<div></div>');
+});
+
+QUnit.test('minimizeStyles', function(assert) {
+  var message = {
+    'html': [
+        '<div id="myId"',
+        'style="animation-delay: 0s; width: 5px;" ',
+        '></div>'
+    ],
+    'frameHoles': null,
+    'idToStyleIndex': {"myId": 1},
+    'idToStyleMap': {
+      'myId': {
+        'animation-delay': '0s',
+        'width': '5px'
+      }
+    },
+    'windowHeight': 5,
+    'windowWidth': 5,
+    'frameIndex': '0'
+  };
+  minimizeStyles(message);
+  assert.equal(message.html[1], 'style="width: 5px;" ');
+});
+
+QUnit.test('minimizeStyle', function(assert) {
+  var fixture = document.getElementById('qunit-fixture');
+  var div = document.createElement('div');
+  div.setAttribute('id', 'myId');
+  div.setAttribute('style', 'animation-delay: 0s; width: 5px;');
+  fixture.appendChild(div);
+  var message = {
+    'html': [
+        '<div id="myId"',
+        'style="animation-delay: 0s; width: 5px;" ',
+        '></div>'
+    ],
+    'frameHoles': null,
+    'idToStyleIndex': {"myId": 1},
+    'idToStyleMap': {
+      'myId': {
+        'animation-delay': '0s',
+        'width': '5px'
+      }
+    },
+    'windowHeight': 5,
+    'windowWidth': 5,
+    'frameIndex': '0'
+  };
+  minimizeStyle(message, document, div, 'myId', 1);
+  assert.equal(message.html[1], 'style="width: 5px;" ');
+});
+
+QUnit.test('serialize tree: end-to-end, no style', function(assert) {
+  var serializer = new HTMLSerializer();
+  var fixture = document.getElementById('qunit-fixture');
+  var iframe = document.createElement('iframe');
+  fixture.appendChild(iframe);
+  var div = document.createElement('div');
+  div.appendChild(document.createTextNode('hello world'));
+  iframe.contentDocument.body.appendChild(div);
+  serializer.processTree(div);
+  var win = div.ownerDocument.defaultView;
+  var message = {
+    'html': serializer.html,
+    'frameHoles': serializer.frameHoles,
+    'idToStyleIndex': serializer.idToStyleIndex,
+    'idToStyleMap': {
+      'snap-it0': {
+        'animation-delay': '0s'
+      }
+    },
+    'windowHeight': serializer.windowHeight,
+    'windowWidth': serializer.windowWidth,
+    'frameIndex': serializer.iframeFullyQualifiedName(win)
+  };
+  var html = unescapeHTML(outputHTMLString([message]), 1);
+  assert.equal(html, '<div id="snap-it0" >hello world</div>');
+});
+
+QUnit.test('serialize tree: end-to-end, style', function(assert) {
+  var serializer = new HTMLSerializer();
+  var fixture = document.getElementById('qunit-fixture');
+  var iframe = document.createElement('iframe');
+  fixture.appendChild(iframe);
+  var div = document.createElement('div');
+  div.appendChild(document.createTextNode('hello world'));
+  iframe.contentDocument.body.appendChild(div);
+  var style = document.createElement('style');
+  style.innerHTML = 'div { border: 1px solid blue; }';
+  iframe.contentDocument.body.appendChild(style);
+  serializer.processTree(div);
+  var win = div.ownerDocument.defaultView;
+  var message = {
+    'html': serializer.html,
+    'frameHoles': serializer.frameHoles,
+    'idToStyleIndex': serializer.idToStyleIndex,
+    'idToStyleMap': {
+      'snap-it0': {
+        'animation-delay': '0s',
+        'border-bottom-color': 'rgb(0, 0, 255)',
+        'border-bottom-style': 'solid',
+        'border-bottom-width': '4px',
+        'border-left-color': 'rgb(0, 0, 255)',
+        'border-left-style': 'solid',
+        'border-left-width': '4px',
+        'border-right-color': 'rgb(0, 0, 255)',
+        'border-right-style': 'solid',
+        'border-right-width': '4px',
+        'border-top-color': 'rgb(0, 0, 255)',
+        'border-top-style': 'solid',
+        'border-top-width': '4px',
+        'width': '276px',
+        'perspective-origin': '142px 24px',
+        'transform-origin': '142px 24px'
+      }
+    },
+    'windowHeight': serializer.windowHeight,
+    'windowWidth': serializer.windowWidth,
+    'frameIndex': serializer.iframeFullyQualifiedName(win)
+  };
+  var html = unescapeHTML(outputHTMLString([message]), 1);
+  assert.equal(
+      html,
+      '<div style="border-bottom-color: rgb(0, 0, 255); border-bottom-style: ' +
+      'solid; border-bottom-width: 4px; border-left-color: rgb(0, 0, 255); ' +
+      'border-left-style: solid; border-left-width: 4px; border-right-color: ' +
+      'rgb(0, 0, 255); border-right-style: solid; border-right-width: 4px; ' +
+      'border-top-color: rgb(0, 0, 255); border-top-style: solid; ' + 
+      'border-top-width: 4px; width: 276px; perspective-origin: 142px 24px; ' +
+      'transform-origin: 142px 24px;" id="snap-it0" >hello world</div>');
+});
+
+QUnit.test('processTree: head tag', function(assert) {
+  var serializer = new HTMLSerializer();
+  var head = document.createElement('head');
+  serializer.processTree(head);
+  assert.equal(serializer.fontPlaceHolderIndex, 4);
+  assert.equal(serializer.pseudoElementPlaceHolderIndex, 5);
+});
+
+QUnit.test('minimizeStyles: root html tag', function(assert) {
+  var message = {
+    'html': [
+        '<html id="myId" ',
+        'style="animation-delay: 0s; width: 5px;" ',
+        '></html>'
+    ],
+    'frameHoles': null,
+    'idToStyleIndex': {},
+    'idToStyleMap': {
+      'myId': {
+        'animation-delay': '0s',
+        'width': '5px'
+      }
+    },
+    'windowHeight': 5,
+    'windowWidth': 5,
+    'rootId': 'myId',
+    'rootStyleIndex': 1,
+    'frameIndex': '0'
+  };
+  minimizeStyles(message);
+  assert.equal(message.html[1], 'style="width: 5px;" ');
+});
+
+QUnit.test('processAttributes: escaping characters', function(assert) {
+  var serializer = new HTMLSerializer();
+  var fixture = document.getElementById('qunit-fixture');
+  var div = document.createElement('div');
+  div.setAttribute('name', '<">');
+  fixture.appendChild(div);
+  serializer.processAttributes(div, 'myId');
+  assert.equal(serializer.html[2], 'name="&lt;&quot;&gt;" ');
+});
+
+QUnit.test('window size comment', function(assert) {
+  var serializer = new HTMLSerializer();
+  serializer.processDocument(document);
+  assert.equal(
+      serializer.html[1],
+      `<!-- Original window height: ${window.innerHeight}. -->\n`);
+  assert.equal(
+      serializer.html[2],
+      `<!-- Original window width: ${window.innerWidth}. -->\n`);
+});
+
+QUnit.test('processDocument: doctype tag', function(assert) {
+  var serializer = new HTMLSerializer();
+  serializer.processDocument(document);
+  assert.equal(serializer.html[0], '<!DOCTYPE html>\n');
+});
+
+QUnit.test('processDocument: no doctype tag', function(assert) {
+  var serializer = new HTMLSerializer();
+  var fixture = document.getElementById('qunit-fixture');
+  var iframe = document.createElement('iframe');
+  fixture.appendChild(iframe);
+  serializer.processDocument(iframe.contentDocument);
+  assert.notEqual(serializer.html[0], '<!DOCTYPE html>\n');
+});
+
+QUnit.test('escapedQuote', function(assert) {
+  assert.equal(escapedQuote(0), '"');
+  assert.equal(escapedQuote(1), '&quot;');
+  assert.equal(escapedQuote(3), '&amp;amp;quot;');
+});
+
+QUnit.test('buildStyleAttribute', function(assert) {
+  var styleMap = {
+    'color': 'blue',
+    'background-color': 'red'
+  }
+  assert.equal(
+      buildStyleAttribute(styleMap),
+      'color: blue; background-color: red;');
+});
+
+QUnit.test('updateMinimizedStyleMap: no update', function(assert) {
+  var fixture = document.getElementById('qunit-fixture');
+  var div = document.createElement('div');
+  div.setAttribute('id', 'myId');
+  div.setAttribute('style', 'width: 5px;');
+  fixture.appendChild(div);
+  var originalStyleMap = {
+    'animation-delay': '0s',
+    'width': '5px'
+  };
+  var requiredStyleMap = {
+    'width': '5px'
+  };
+  var updated = updateMinimizedStyleMap(
+      document,
+      div,
+      originalStyleMap,
+      requiredStyleMap,
+      null);
+  assert.notOk(updated);
+  assert.equal(Object.keys(requiredStyleMap).length, 1);
+  assert.equal(requiredStyleMap.width, '5px');
+});
+
+QUnit.test('updateMinimizedStyleMap: update', function(assert) {
+  var fixture = document.getElementById('qunit-fixture');
+  var div = document.createElement('div');
+  div.setAttribute('id', 'myId');
+  fixture.appendChild(div);
+  var originalStyleMap = {
+    'animation-delay': '0s',
+    'width': '5px'
+  };
+  var requiredStyleMap = {};
+  var updated = updateMinimizedStyleMap(
+      document,
+      div,
+      originalStyleMap,
+      requiredStyleMap,
+      null);
+  assert.ok(updated);
+  assert.equal(Object.keys(requiredStyleMap).length, 1);
+  assert.equal(requiredStyleMap.width, '5px');
+});
+
+QUnit.test('minimizePseudoElementStyle', function(assert) {
+  var fixture = document.getElementById('qunit-fixture');
+  var div = document.createElement('div');
+  div.setAttribute('id', 'divId');
+  var pseudoElementStyle = document.createElement('style');
+  pseudoElementStyle.innerHTML =
+      '#divId::before{animation-delay: 0s; content:"hello"}';
+  var testingStyle = document.createElement('style');
+  testingStyle.setAttribute('id', 'styleId');
+  fixture.appendChild(div);
+  fixture.appendChild(pseudoElementStyle);
+  fixture.appendChild(testingStyle);
+  var message = {
+    'pseudoElementSelectorToCSSMap': {
+      '#divId::before': {
+        'animation-delay': '0s',
+        'content': 'hello'
+      }
+    },
+    'pseudoElementTestingStyleId': 'styleId',
+    'unusedId': 'unusedId',
+    'frameIndex': '0'
+  }
+  var finalPseudoElementCSS = [];
+  minimizePseudoElementStyle(
+      message,
+      document,
+      '#divId::before',
+      finalPseudoElementCSS);
+  assert.equal(
+      finalPseudoElementCSS.join(' '),
+      '#divId::before{ content: hello; }');
+});
+
+QUnit.test('minimizeStyles: pseudo elements', function(assert) {
+  var message = {
+    'html': [
+        '<div id="divId"',
+        'style="animation-delay: 0s; width: 5px;" ',
+        '></div>',
+        '<style>#divId::before{animation-delay: 0s; content:"hello"}</style>',
+        '<style id="styleId"></style>'
+    ],
+    'pseudoElementSelectorToCSSMap': {
+      '#divId::before': {
+        'animation-delay': '0s',
+        'content': 'hello'
+      }
+    },
+    'pseudoElementPlaceHolderIndex': 3,
+    'pseudoElementTestingStyleIndex': 4,
+    'pseudoElementTestingStyleId': 'styleId',
+    'unusedId': 'unusedId',
+    'frameHoles': null,
+    'idToStyleIndex': {"divId": 1},
+    'idToStyleMap': {
+      'divId': {
+        'animation-delay': '0s',
+        'width': '5px'
+      }
+    },
+    'windowHeight': 5,
+    'windowWidth': 5,
+    'frameIndex': '0'
+  };
+  minimizeStyles(message);
+  assert.equal(
+      message.html[3],
+      '<style>#divId::before{ content: hello; }</style>');
+});