The Tor Browser: dom/tests/mochitest/general/test_clipboard

dom/tests/mochitest/general/test_clipboard_events.html@b8a032363ba2 (annotated)

dom/tests/mochitest/general/test_clipboard_events.html

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 <!DOCTYPE HTML>
 <html>
 <head>
   <title>Test for Clipboard Events</title>
   <script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
   <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
   <script type="application/javascript" src="/tests/SimpleTest/EventUtils.js"></script>
   <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
 </head>
 <body>
 <p id="display"></p>
 <div id="content" style="border: 3px solid black; padding: 3em;">CONTENT TEXT<input id="content-input" value="INPUT TEXT"></div>
 <button id="button">Button</button>
 <div id="syntheticSpot" oncut="compareSynthetic(event, 'cut')"
                         oncopy="compareSynthetic(event, 'copy')"
                         onpaste="compareSynthetic(event, 'paste')">Spot</div>
 <pre id="test">
 <script class="testbody" type="text/javascript;version=1.7">
 var content = document.getElementById("content");
 var contentInput = document.getElementById("content-input");
 var clipboardInitialValue = "empty";
 // Test that clearing and reading the clipboard works.  A random number
 // is used to make sure that leftover clipboard values from a previous
 // test run don't cause a false-positive test.
 var cb_text = "empty_" + Math.random();
 setClipboardText(cb_text);
 is(getClipboardText(), cb_text, "set/get clipboard text failed");
 // Some test functions need to be run with delays.
 var delayedTests = [];
 var cachedCutData, cachedCopyData, cachedPasteData;
 // Ensure window focus before running tests, otherwise key events can
 // misfire.  We set the onfocus event handler here to actually begin
 // running tests, and call window.focus() afterwards.
 window.onfocus = function()
 {
   window.onfocus = null;
   // A list of test functions to run.  Before each test function is run, the
   // clipboard is initialized to clipboardInitialValue, and the contents of
   // div#content are set as the window's selection.
   var testFunctions = [
     test_dom_oncopy,
     test_dom_oncut,
     test_dom_onpaste,
     test_dom_oncopy_abort,
     test_input_oncopy,
     test_input_oncut,
     test_input_onpaste,
     test_input_oncopy_abort,
     test_input_oncut_abort,
     test_input_onpaste_abort,
     test_input_cut_dataTransfer,
     test_input_cut_abort_dataTransfer,
     test_input_copy_dataTransfer,
     test_input_paste_dataTransfer,
     test_input_paste_abort_dataTransfer,
     test_input_copypaste_dataTransfer_multiple,
     test_input_copy_button_dataTransfer,
     test_eventspref_disabled
     ];
   // Run the main tests.  This will also populate the delayedTests array
   for (let i = 0; i < testFunctions.length; i++) {
     // Init clipboard
     setClipboardText(clipboardInitialValue);
     // Reset value of contentInput.
     contentInput.value = "INPUT TEXT";
     var func = testFunctions[i];
     func();
   }
   // Check if the cached clipboard data can be accessed or modified
   // and whether it modifies the real clipboard
   checkCachedDataTransfer(cachedCutData, "cut");
   checkCachedDataTransfer(cachedCopyData, "copy");
   checkCachedDataTransfer(cachedPasteData, "paste");
   checkSyntheticEvents();
   SimpleTest.finish();
 }
 // Calling .focus begins the test run.
 SimpleTest.waitForExplicitFinish();
 window.focus();
 function getLoadContext() {
   return SpecialPowers.wrap(window).QueryInterface(SpecialPowers.Ci.nsIInterfaceRequestor)
                .getInterface(SpecialPowers.Ci.nsIWebNavigation)
                .QueryInterface(SpecialPowers.Ci.nsILoadContext);
 }
 function getClipboardText() {
   return SpecialPowers.getClipboardData("text/unicode");
 }
 function setClipboardText(text) {
   var helper = SpecialPowers.Cc["@mozilla.org/widget/clipboardhelper;1"]
     .getService(SpecialPowers.Ci.nsIClipboardHelper);
   helper.copyString(text);
 }
 function selectContentDiv() {
   // Set selection
   var selection = window.getSelection();
   selection.removeAllRanges();
   selection.selectAllChildren(content);
 }
 function selectContentInput() {
   contentInput.select();
   contentInput.focus();
 }
 function test_dom_oncopy() {
   // Setup an oncopy event handler, fire copy.  Ensure that the event
   // handler was called, and the clipboard contents have set to CONTENT TEXT.
   // Test firing oncopy event on ctrl-c:
   selectContentDiv();
   var oncopy_fired = false;
   content.oncopy = function() { oncopy_fired = true; };
   try {
     synthesizeKey("c", {accelKey: 1});
     ok(oncopy_fired, "copy event firing on DOM element");
     is(getClipboardText(), "CONTENT TEXT",
       "copy on DOM element set clipboard correctly");
   } finally {
     content.oncopy = null;
   }
 }
 function test_dom_oncut() {
   // Setup an oncut event handler, fire cut.  Ensure that the event handler
   // was called.  The <div> doesn't handle a cut, so ensure that the
   // clipboard text is clipboardInitialValue, NOT "CONTENT TEXT".
   selectContentDiv();
   var oncut_fired = false;
   content.oncut = function() { oncut_fired = true; };
   try {
     synthesizeKey("x", {accelKey: 1});
     ok(!oncut_fired, "cut event firing on DOM element")
     is(getClipboardText(), clipboardInitialValue,
       "cut on DOM element did not modify clipboard");
   } finally {
     content.oncut = null;
   }
 }
 function test_dom_onpaste() {
   // Setup an onpaste event handler, fire paste.  Ensure that the event
   // handler was called.
   selectContentDiv();
   var onpaste_fired = false;
   content.onpaste = function() { onpaste_fired = true; };
   try {
     synthesizeKey("v", {accelKey: 1});
     ok(!onpaste_fired, "paste event firing on DOM element");
   } finally {
     content.onpaste = null;
   }
 }
 function test_dom_oncopy_abort() {
   // Setup an oncopy event handler that aborts the copy, and fire the copy
   // event.  Ensure that the event handler was fired, and the clipboard
   // contents have not been modified.
   selectContentDiv();
   var oncopy_fired = false;
   content.oncopy = function() { oncopy_fired = true; return false; };
   try {
     synthesizeKey("c", {accelKey: 1});
     ok(oncopy_fired, "copy event (to-be-cancelled) firing on DOM element");
     is(getClipboardText(), clipboardInitialValue,
       "aborted copy on DOM element did not modify clipboard");
   } finally {
     content.oncopy = null;
   }
 }
 function test_input_oncopy() {
   // Setup an oncopy event handler, fire copy.  Ensure that the event
   // handler was called, and the clipboard contents have been set to 'PUT TE',
   // which is the part that is selected below.
   selectContentInput();
   contentInput.focus();
   contentInput.setSelectionRange(2, 8);
   var oncopy_fired = false;
   contentInput.oncopy = function() { oncopy_fired = true; };
   try {
     synthesizeKey("c", {accelKey: 1});
     ok(oncopy_fired, "copy event firing on plaintext editor");
     is(getClipboardText(), "PUT TE",
       "copy on plaintext editor set clipboard correctly");
   } finally {
     contentInput.oncopy = null;
   }
 }
 function test_input_oncut() {
   // Setup an oncut event handler, and fire cut.  Ensure that the event
   // handler was fired, the clipboard contains the INPUT TEXT, and
   // that the input itself is empty.
   selectContentInput();
   var oncut_fired = false;
   contentInput.oncut = function() { oncut_fired = true; };
   try {
     synthesizeKey("x", {accelKey: 1});
     ok(oncut_fired, "cut event firing on plaintext editor");
     is(getClipboardText(), "INPUT TEXT",
       "cut on plaintext editor set clipboard correctly");
     is(contentInput.value, "",
       "cut on plaintext editor emptied editor");
   } finally {
     contentInput.oncut = null;
   }
 }
 function test_input_onpaste() {
   // Setup an onpaste event handler, and fire paste.  Ensure that the event
   // handler was fired, the clipboard contents didn't change, and that the
   // input value did change (ie. paste succeeded).
   selectContentInput();
   var onpaste_fired = false;
   contentInput.onpaste = function() { onpaste_fired = true; };
   try {
     synthesizeKey("v", {accelKey: 1});
     ok(onpaste_fired, "paste event firing on plaintext editor");
     is(getClipboardText(), clipboardInitialValue,
       "paste on plaintext editor did not modify clipboard contents");
     is(contentInput.value, clipboardInitialValue,
       "paste on plaintext editor did modify editor value");
   } finally {
     contentInput.onpaste = null;
   }
 }
 function test_input_oncopy_abort() {
   // Setup an oncopy event handler, fire copy.  Ensure that the event
   // handler was called, and that the clipboard value did NOT change.
   selectContentInput();
   var oncopy_fired = false;
   contentInput.oncopy = function() { oncopy_fired = true; return false; };
   try {
     synthesizeKey("c", {accelKey: 1});
     ok(oncopy_fired, "copy event (to-be-cancelled) firing on plaintext editor");
     is(getClipboardText(), clipboardInitialValue,
       "aborted copy on plaintext editor did not modify clipboard");
   } finally {
     contentInput.oncopy = null;
   }
 }
 function test_input_oncut_abort() {
   // Setup an oncut event handler, and fire cut.  Ensure that the event
   // handler was fired, the clipboard contains the INPUT TEXT, and
   // that the input itself is empty.
   selectContentInput();
   var oncut_fired = false;
   contentInput.oncut = function() { oncut_fired = true; return false; };
   try {
     synthesizeKey("x", {accelKey: 1});
     ok(oncut_fired, "cut event (to-be-cancelled) firing on plaintext editor");
     is(getClipboardText(), clipboardInitialValue,
       "aborted cut on plaintext editor did not modify clipboard.");
     is(contentInput.value, "INPUT TEXT",
       "aborted cut on plaintext editor did not modify editor contents");
   } finally {
     contentInput.oncut = null;
   }
 }
 function test_input_onpaste_abort() {
   // Setup an onpaste event handler, and fire paste.  Ensure that the event
   // handler was fired, the clipboard contents didn't change, and that the
   // input value did change (ie. paste succeeded).
   selectContentInput();
   var onpaste_fired = false;
   contentInput.onpaste = function() { onpaste_fired = true; return false; };
   try {
     synthesizeKey("v", {accelKey: 1});
     ok(onpaste_fired,
       "paste event (to-be-cancelled) firing on plaintext editor");
     is(getClipboardText(), clipboardInitialValue,
       "aborted paste on plaintext editor did not modify clipboard");
     is(contentInput.value, "INPUT TEXT",
       "aborted paste on plaintext editor did not modify modified editor value");
   } finally {
     contentInput.onpaste = null;
   }
 }
 function test_input_cut_dataTransfer() {
   // Cut using event.dataTransfer. The event is not cancelled so the default
   // cut should occur
   selectContentInput();
   contentInput.oncut = function(event) {
     ok(event instanceof ClipboardEvent, "cut event is a ClipboardEvent");
     ok(event.clipboardData instanceof DataTransfer, "cut event dataTransfer is a DataTransfer");
     is(event.target, contentInput, "cut event target");
     is(event.clipboardData.mozItemCount, 0, "cut event mozItemCount");
     is(event.clipboardData.getData("text/plain"), "", "cut event getData");
     event.clipboardData.setData("text/plain", "This is some dataTransfer text");
     cachedCutData = event.clipboardData;
   };
   try {
     synthesizeKey("x", {accelKey: 1});
     is(getClipboardText(), "INPUT TEXT",
       "cut using dataTransfer on plaintext editor set clipboard correctly");
     is(contentInput.value, "",
       "cut using dataTransfer on plaintext editor cleared input");
   } finally {
     contentInput.oncut = null;
   }
 }
 function test_input_cut_abort_dataTransfer() {
   // Cut using event.dataTransfer but cancel the event. The data should be
   // put on the clipboard but since we don't modify the input value, the input
   // should have the same value.
   selectContentInput();
   contentInput.oncut = function(event) {
     event.clipboardData.setData("text/plain", "Cut dataTransfer text");
     return false;
   };
   try {
     synthesizeKey("x", {accelKey: 1});
     is(getClipboardText(), "Cut dataTransfer text",
       "aborted cut using dataTransfer on plaintext editor set clipboard correctly");
     is(contentInput.value, "INPUT TEXT",
       "aborted cut using dataTransfer on plaintext editor did not modify input");
   } finally {
     contentInput.oncut = null;
   }
 }
 function test_input_copy_dataTransfer() {
   // Copy using event.dataTransfer
   selectContentInput();
   contentInput.oncopy = function(event) {
     ok(event instanceof ClipboardEvent, "copy event is a ClipboardEvent");
     ok(event.clipboardData instanceof DataTransfer, "copy event dataTransfer is a DataTransfer");
     is(event.target, contentInput, "copy event target");
     is(event.clipboardData.mozItemCount, 0, "copy event mozItemCount");
     is(event.clipboardData.getData("text/plain"), "", "copy event getData");
     event.clipboardData.setData("text/plain", "Copied dataTransfer text");
     cachedCopyData = event.clipboardData;
   };
   try {
     synthesizeKey("c", {accelKey: 1});
     is(getClipboardText(), "INPUT TEXT",
       "copy using dataTransfer on plaintext editor set clipboard correctly");
     is(contentInput.value, "INPUT TEXT",
       "copy using dataTransfer on plaintext editor did not modify input");
   } finally {
     contentInput.oncopy = null;
   }
 }
 function test_input_copy_abort_dataTransfer() {
   // Copy using event.dataTransfer but cancel the event.
   selectContentInput();
   contentInput.oncopy = function(event) {
     event.clipboardData.setData("text/plain", "Copy dataTransfer text");
     return false;
   };
   try {
     synthesizeKey("x", {accelKey: 1});
     is(getClipboardText(), "Copy dataTransfer text",
       "aborted copy using dataTransfer on plaintext editor set clipboard correctly");
     is(contentInput.value, "INPUT TEXT",
       "aborted copy using dataTransfer on plaintext editor did not modify input");
   } finally {
     contentInput.oncopy = null;
   }
 }
 function test_input_paste_dataTransfer() {
   // Paste using event.dataTransfer
   selectContentInput();
   contentInput.onpaste = function(event) {
     ok(event instanceof ClipboardEvent, "paste event is an ClipboardEvent");
     ok(event.clipboardData instanceof DataTransfer, "paste event dataTransfer is a DataTransfer");
     is(event.target, contentInput, "paste event target");
     is(event.clipboardData.mozItemCount, 1, "paste event mozItemCount");
     is(event.clipboardData.getData("text/plain"), clipboardInitialValue, "paste event getData");
     cachedPasteData = event.clipboardData;
   };
   try {
     synthesizeKey("v", {accelKey: 1});
     is(getClipboardText(), clipboardInitialValue,
       "paste using dataTransfer on plaintext editor did not modify clipboard contents");
     is(contentInput.value, clipboardInitialValue,
       "paste using dataTransfer on plaintext editor modified input");
   } finally {
     contentInput.onpaste = null;
   }
 }
 function test_input_paste_abort_dataTransfer() {
   // Paste using event.dataTransfer but cancel the event
   selectContentInput();
   contentInput.onpaste = function(event) {
     is(event.clipboardData.getData("text/plain"), clipboardInitialValue, "get data on aborted paste");
     contentInput.value = "Alternate Paste";
     return false;
   };
   try {
     synthesizeKey("v", {accelKey: 1});
     is(getClipboardText(), clipboardInitialValue,
       "aborted paste using dataTransfer on plaintext editor did not modify clipboard contents");
     is(contentInput.value, "Alternate Paste",
       "aborted paste using dataTransfer on plaintext editor modified input");
   } finally {
     contentInput.onpaste = null;
   }
 }
 function test_input_copypaste_dataTransfer_multiple() {
   // Cut several types of data and paste it again
   contentInput.value = "This is a line of text";
   contentInput.oncopy = function(event) {
     var cd = event.clipboardData;
     cd.setData("text/plain", "would be a phrase");
     var exh = false;
     try { cd.mozSetDataAt("text/plain", "Text", 1); } catch (ex) { exh = true; }
     ok(exh, "exception occured mozSetDataAt 1");
     exh = false;
     try { cd.mozTypesAt(1); } catch (ex) { exh = true; }
     ok(exh, "exception occured mozTypesAt 1");
     exh = false;
     try { cd.mozGetDataAt("text/plain", 1); } catch (ex) { exh = true; }
     ok(exh, "exception occured mozGetDataAt 1");
     exh = false;
     try { cd.mozClearDataAt("text/plain", 1); } catch (ex) { exh = true; }
     ok(exh, "exception occured mozClearDataAt 1");
     cd.setData("text/x-moz-url", "http://www.mozilla.org");
     cd.mozSetDataAt("text/x-custom", "Custom Text", 0);
     is(cd.mozItemCount, 1, "mozItemCount after set multiple types");
     return false;
   };
   try {
     selectContentInput();
     synthesizeKey("c", {accelKey: 1});
   }
   finally {
     contentInput.oncopy = null;
   }
   is(getClipboardText(), "would be a phrase", "copy multiple types text");
   contentInput.setSelectionRange(5, 14);
   contentInput.onpaste = function(event) {
     var cd = event.clipboardData;
     is(cd.mozItemCount, 1, "paste after copy multiple types mozItemCount");
     is(cd.getData("text/plain"), "would be a phrase", "paste text/plain multiple types");
     // Firefox for Android's clipboard code doesn't handle x-moz-url. Therefore
     // disabling the following test. Enable this once bug #840101 is fixed.
     if (navigator.appVersion.indexOf("Android") == -1) {
       is(cd.getData("text/x-moz-url"), "http://www.mozilla.org", "paste text/x-moz-url multiple types");
     }
     // this is empty because only the built-in types are supported at the moment
     is(cd.getData("text/x-custom"), "", "paste text/custom multiple types");
     exh = false;
     try { cd.setData("text/plain", "Text on Paste"); } catch (ex) { exh = true; }
     ok(exh, "exception occured setData on paste");
     is(cd.getData("text/plain"), "would be a phrase", "text/plain data unchanged");
   };
   try {
     synthesizeKey("v", {accelKey: 1});
     is(contentInput.value, "This would be a phrase of text",
       "default paste after copy multiple types");
   } finally {
     contentInput.onpaste = null;
   }
 }
 function test_input_copy_button_dataTransfer() {
   // Copy using event.dataTransfer when a button is focused.
   var button = document.getElementById("button");
   button.focus();
   button.oncopy = function(event) {
     ok(false, "should not be firing copy event on button");
     return false;
   };
   try {
     // copy should not occur here because buttons don't have any controller
     // for the copy command
     synthesizeKey("c", {accelKey: 1});
     is(getClipboardText(), clipboardInitialValue,
       "copy using dataTransfer on plaintext editor set clipboard correctly for button");
     selectContentDiv();
     synthesizeKey("c", {accelKey: 1});
     is(getClipboardText(), "CONTENT TEXT",
       "copy using dataTransfer with selection on plaintext editor set clipboard correctly for button");
   } finally {
     document.documentElement.oncopy = null;
   }
 }
 function test_eventspref_disabled() {
   // Disable clipboard events
   SpecialPowers.setBoolPref("dom.event.clipboardevents.enabled", false);
   var event_fired = false;
   contentInput.oncut = function() { event_fired = true; };
   contentInput.oncopy = function() { event_fired = true; };
   contentInput.onpaste = function() { event_fired = true; };
   try {
     selectContentInput();
     contentInput.setSelectionRange(1, 4);
     synthesizeKey("x", {accelKey: 1});
     is(contentInput.value, "IT TEXT", "cut changed text when preference is disabled");
     is(getClipboardText(), "NPU", "cut changed clipboard when preference is disabled");
     ok(!event_fired, "cut event did not fire when preference is disabled")
     event_fired = false;
     contentInput.setSelectionRange(3, 6);
     synthesizeKey("c", {accelKey: 1});
     is(getClipboardText(), "TEX", "copy changed clipboard when preference is disabled");
     ok(!event_fired, "copy event did not fire when preference is disabled")
     event_fired = false;
     contentInput.setSelectionRange(0, 2);
     synthesizeKey("v", {accelKey: 1});
     is(contentInput.value, "TEX TEXT", "paste changed text when preference is disabled");
     ok(!event_fired, "paste event did not fire when preference is disabled")
   } finally {
     contentInput.oncut = null;
     contentInput.oncopy = null;
     contentInput.onpaste = null;
   }
   SpecialPowers.clearUserPref("dom.event.clipboardevents.enabled");
 }
 let expectedData = [];
 // Check to make that synthetic events do not change the clipboard
 function checkSyntheticEvents()
 {
   let syntheticSpot = document.getElementById("syntheticSpot");
   setClipboardText(clipboardInitialValue);
   // No dataType specified
   let event = new ClipboardEvent("cut", { data: "something" });
   expectedData = { type: "cut", data: null }
   compareSynthetic(event, "before");
   syntheticSpot.dispatchEvent(event);
   ok(expectedData.eventFired, "cut event fired");
   compareSynthetic(event, "after");
   event = new ClipboardEvent("cut", { dataType: "text/plain", data: "something" });
   expectedData = { type: "cut", dataType: "text/plain", data: "something" }
   compareSynthetic(event, "before");
   syntheticSpot.dispatchEvent(event);
   ok(expectedData.eventFired, "cut event fired");
   compareSynthetic(event, "after");
   event = new ClipboardEvent("copy", { dataType: "text/plain", data: "something" });
   expectedData = { type: "copy", dataType: "text/plain", data: "something" }
   compareSynthetic(event, "before");
   syntheticSpot.dispatchEvent(event);
   ok(expectedData.eventFired, "copy event fired");
   compareSynthetic(event, "after");
   event = new ClipboardEvent("copy", { dataType: "text/plain" });
   expectedData = { type: "copy", dataType: "text/plain", data: "" }
   compareSynthetic(event, "before");
   syntheticSpot.dispatchEvent(event);
   ok(expectedData.eventFired, "copy event fired");
   compareSynthetic(event, "after");
   event = new ClipboardEvent("paste", { dataType: "text/plain", data: "something" });
   expectedData = { type: "paste", dataType: "text/plain", data: "something" }
   compareSynthetic(event, "before");
   syntheticSpot.dispatchEvent(event);
   ok(expectedData.eventFired, "paste event fired");
   compareSynthetic(event, "after");
   event = new ClipboardEvent("paste", { dataType: "application/unknown", data: "unknown" });
   expectedData = { type: "paste", dataType: "application/unknown", data: "unknown" }
   compareSynthetic(event, "before");
   syntheticSpot.dispatchEvent(event);
   ok(expectedData.eventFired, "paste event fired");
   compareSynthetic(event, "after");
 }
 function compareSynthetic(event, eventtype)
 {
   let step = (eventtype == "cut" || eventtype == "copy" || eventtype == "paste") ? "during" : eventtype;
   if (step == "during") {
     is(eventtype, expectedData.type, "synthetic " + eventtype + " event fired");
   }
   ok(event.clipboardData instanceof DataTransfer, "clipboardData is assigned");
   is(event.type, expectedData.type, "synthetic " + eventtype + " event type");
   if (expectedData.data === null) {
     is(event.clipboardData.mozItemCount, 0, "synthetic " + eventtype + " empty data");
   }
   else {
     is(event.clipboardData.mozItemCount, 1, "synthetic " + eventtype + " item count");
     is(event.clipboardData.types.length, 1, "synthetic " + eventtype + " types length");
     is(event.clipboardData.getData(expectedData.dataType), expectedData.data,
        "synthetic " + eventtype + " data");
   }
   is(getClipboardText(), "empty", "event does not change the clipboard " + step + " dispatch");
   if (step == "during") {
     expectedData.eventFired = true;
   }
 }
 function checkCachedDataTransfer(cd, eventtype)
 {
   var testprefix = "cached " + eventtype + " dataTransfer";
   setClipboardText("Some Clipboard Text");
   var oldtext = cd.getData("text/plain");
   ok(oldtext != "Some Clipboard Text", "clipboard get using " + testprefix);
   var exh = false;
   try { cd.mozSetDataAt("text/plain", "Test Cache Data", 0); } catch (ex) { exh = true; }
   ok(eventtype == "paste" ? exh : !exh, "exception occured setting " + testprefix);
   var newtext = (eventtype == "paste") ? cd.getData("text/plain") :
                                          cd.mozGetDataAt("text/plain", 0);
   is(newtext, (eventtype == "paste") ? "" : "Test Cache Data",
      " clipboardData not changed using " + testprefix);
   is(getClipboardText(), "Some Clipboard Text", "clipboard not changed using " + testprefix);
   var exh = false;
   try { cd.mozClearDataAt("text/plain", 0); } catch (ex) { exh = true; }
   ok(eventtype == "paste" ? exh : !exh, "exception occured clearing " + testprefix);
   is(getClipboardText(), "Some Clipboard Text", "clipboard not changed using " + testprefix);
 }
 </script>
 </pre>
 </body>
 </html>

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