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diff --git a/dom/tests/mochitest/general/test_bug1012662_common.js b/dom/tests/mochitest/general/test_bug1012662_common.js
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+++ b/dom/tests/mochitest/general/test_bug1012662_common.js
@@ -0,0 +1,341 @@
+/** Test for Bug 1012662 **/
+// This test is called from both test_bug1012662_editor.html and test_bug1012662_noeditor.html
+// This is to test that the code works both in the presence of a contentEditable node, and in the absense of one
+var WATCH_TIMEOUT = 300;
+
+// Some global variables to make the debug messages easier to track down
+var gTestN0 = 0, gTestN1 = 0, gTestN2 = 0;
+function testLoc() { return " " + gTestN0 + " - " + gTestN1 + " - " + gTestN2; }
+
+// Listen for cut & copy events
+var gCopyCount = 0, gCutCount = 0;
+document.addEventListener('copy', function() {
+  gCopyCount++;
+});
+document.addEventListener('cut', function() {
+  gCutCount++;
+});
+
+
+// Helper methods
+function selectNode(aSelector, aCb) {
+  var dn = document.querySelector(aSelector);
+  var range = document.createRange();
+  range.selectNodeContents(dn);
+  window.getSelection().removeAllRanges();
+  window.getSelection().addRange(range);
+  if (aCb) {
+    aCb();
+  }
+}
+
+function selectInputNode(aSelector, aCb) {
+  var dn = document.querySelector(aSelector);
+  synthesizeMouse(dn, 10, 10, {});
+  SimpleTest.executeSoon(function() {
+    synthesizeKey("A", {accelKey: true});
+    SimpleTest.executeSoon(aCb);
+  });
+}
+
+// Callback functions for attaching to the button
+function execCut(aShouldSucceed) {
+  var cb = function(e) {
+    e.preventDefault();
+    document.removeEventListener('keydown', cb);
+
+    is(aShouldSucceed, document.execCommand('cut'), "Keydown caused cut invocation" + testLoc());
+  };
+  return cb;
+}
+function execCopy(aShouldSucceed) {
+  var cb = function(e) {
+    e.preventDefault();
+    document.removeEventListener('keydown', cb);
+
+    is(aShouldSucceed, document.execCommand('copy'), "Keydown caused copy invocation" + testLoc());
+  };
+  return cb;
+}
+
+// The basic test set. Tries to cut/copy everything
+function cutCopyAll(aDoCut, aDoCopy, aDone, aNegate, aClipOverride, aJustClipboardNegate) {
+  var execCommandAlwaysSucceed = !!(aClipOverride || aJustClipboardNegate);
+
+  function waitForClipboard(aCond, aSetup, aNext, aNegateOne) {
+    if (aClipOverride) {
+      aCond = aClipOverride;
+      aNegateOne = false;
+    }
+    if (aNegate || aNegateOne || aJustClipboardNegate) {
+      SimpleTest.waitForClipboard(null, aSetup, aNext, aNext, "text/unicode", WATCH_TIMEOUT, true);
+    } else {
+      SimpleTest.waitForClipboard(aCond, aSetup, aNext, aNext);
+    }
+  }
+
+  function validateCutCopy(aExpectedCut, aExpectedCopy) {
+    if (aNegate) {
+      aExpectedCut = aExpectedCopy = 0;
+    } // When we are negating - we always expect callbacks not to be run
+
+    is(aExpectedCut, gCutCount,
+       (aExpectedCut > 0 ? "Expect cut callback to run" : "Expect cut callback not to run") + testLoc());
+    is(aExpectedCopy, gCopyCount,
+       (aExpectedCopy > 0 ? "Expect copy callback to run" : "Expect copy callback not to run") + testLoc());
+    gCutCount = gCopyCount = 0;
+  }
+
+  function step(n) {
+    function nextStep() { step(n + 1); }
+
+    document.querySelector('span').textContent = 'span text';
+    document.querySelector('input[type=text]').value = 'text text';
+    document.querySelector('input[type=password]').value = 'password text';
+    document.querySelector('textarea').value = 'textarea text';
+
+    var contentEditableNode = document.querySelector('div[contentEditable=true]');
+    if (contentEditableNode) {
+      contentEditableNode.textContent = 'contenteditable text';
+    }
+
+    gTestN2 = n;
+    switch (n) {
+    case 0:
+      // copy on readonly selection
+      selectNode('span');
+      waitForClipboard("span text", function() {
+        aDoCopy(true);
+      }, nextStep);
+      return;
+
+    case 1:
+      validateCutCopy(0, 1);
+
+      // cut on readonly selection
+      selectNode('span');
+
+      waitForClipboard("span text", function() {
+        aDoCut(execCommandAlwaysSucceed);
+      }, nextStep, true);
+      return;
+
+    case 2:
+      validateCutCopy(1, 0);
+
+      // copy on textbox selection
+      selectInputNode('input[type=text]', nextStep);
+      return;
+
+    case 3:
+      waitForClipboard("text text", function() {
+        selectInputNode('input[type=text]', function() { aDoCopy(true); });
+      }, nextStep);
+      return;
+
+    case 4:
+      validateCutCopy(0, 1);
+
+      // cut on textbox selection
+      selectInputNode('input[type=text]', nextStep);
+      return;
+
+    case 5:
+      waitForClipboard("text text", function() {
+        aDoCut(true);
+      }, nextStep);
+      return;
+
+    case 6:
+      validateCutCopy(1, 0);
+
+      // copy on password selection
+      selectInputNode('input[type=password]', nextStep);
+      return;
+
+    case 7:
+      waitForClipboard(null, function() {
+        aDoCopy(execCommandAlwaysSucceed);
+      }, nextStep, true);
+      return;
+
+    case 8:
+      validateCutCopy(0, 1);
+
+      // cut on password selection
+      selectInputNode('input[type=password]', nextStep);
+      return;
+
+    case 9:
+      waitForClipboard(null, function() {
+        aDoCut(execCommandAlwaysSucceed);
+      }, nextStep, true);
+      return;
+
+    case 10:
+      validateCutCopy(1, 0);
+
+      // copy on textarea selection
+      selectInputNode('textarea', nextStep);
+      return;
+
+    case 11:
+      waitForClipboard("textarea text", function() {
+        aDoCopy(true);
+      }, nextStep);
+      return;
+
+    case 12:
+      validateCutCopy(0, 1);
+
+      // cut on password selection
+      selectInputNode('textarea', nextStep);
+      return;
+
+    case 13:
+      waitForClipboard("textarea text", function() {
+        aDoCut(true);
+      }, nextStep);
+      return;
+
+    case 14:
+      validateCutCopy(1, 0);
+
+      // copy on no selection
+      document.querySelector('textarea').blur();
+
+      waitForClipboard(null, function() {
+        aDoCopy(true);
+      }, nextStep, true);
+      return;
+
+    case 15:
+      validateCutCopy(0, 1);
+
+      // cut on no selection
+      waitForClipboard(null, function() {
+        aDoCut(execCommandAlwaysSucceed);
+      }, nextStep, true);
+      return;
+
+    case 16:
+      validateCutCopy(1, 0);
+
+      if (!document.querySelector('div[contentEditable=true]')) {
+        // We're done! (no contentEditable node!)
+        step(-1);
+        return;
+      }
+      break;
+
+    case 17:
+      // copy on contenteditable selection
+      waitForClipboard("contenteditable text", function() {
+        selectNode('div[contentEditable=true]', function() {
+          aDoCopy(true);
+        });
+      }, nextStep);
+      return;
+
+    case 18:
+      validateCutCopy(0, 1);
+      break;
+
+    case 19:
+      // cut on contenteditable selection
+      waitForClipboard("contenteditable text", function() {
+        selectNode('div[contentEditable=true]', function() {
+          aDoCut(true);
+        });
+      }, nextStep);
+      return;
+
+    case 20:
+      validateCutCopy(1, 0);
+      break;
+
+    default:
+      aDone();
+      return;
+    }
+
+    SimpleTest.executeSoon(function() { step(n + 1); });
+  }
+
+  step(0);
+}
+
+function allMechanisms(aCb, aClipOverride, aNegateAll) {
+  function testStep(n) {
+    gTestN1 = n;
+    switch (n) {
+    case 0:
+      // Keyboard issued
+      cutCopyAll(function docut(aSucc) {
+        synthesizeKey("X", {accelKey: true});
+      }, function docopy(aSucc) {
+        synthesizeKey("C", {accelKey: true});
+      }, function done() { testStep(n + 1); }, false, aClipOverride, aNegateAll);
+      return;
+
+    case 1:
+      // Button issued
+      cutCopyAll(function docut(aSucc) {
+        document.addEventListener('keydown', execCut(aSucc));
+        synthesizeKey("Q", {});
+      }, function docopy(aSucc) {
+        document.addEventListener('keydown', execCopy(aSucc));
+        synthesizeKey("Q", {});
+      }, function done() { testStep(n + 1); }, false, aClipOverride, aNegateAll);
+      return;
+
+    case 2:
+      // Button issued
+      cutCopyAll(function doCut(aSucc) {
+        is(false, document.execCommand('cut'), "Can't directly execCommand not in a user callback");
+      }, function doCopy(aSucc) {
+        is(false, document.execCommand('copy'), "Can't directly execCommand not in a user callback");
+      }, function done() { testStep(n + 1); }, true, aClipOverride, aNegateAll);
+      return;
+
+    default:
+      aCb();
+      return;
+    }
+
+    SimpleTest.executeSoon(function() { testStep(n + 1); });
+  }
+  testStep(0);
+}
+
+// Run the tests
+SimpleTest.waitForExplicitFinish();
+SimpleTest.requestLongerTimeout(5); // On the emulator - this times out occasionally
+SimpleTest.waitForFocus(function() {
+  function justCancel(aEvent) {
+    aEvent.preventDefault();
+  }
+
+  function override(aEvent) {
+    aEvent.clipboardData.setData('text/plain', 'overridden');
+    aEvent.preventDefault();
+  }
+
+  allMechanisms(function() {
+    gTestN0 = 1;
+    document.addEventListener('cut', override);
+    document.addEventListener('copy', override);
+
+    allMechanisms(function() {
+      gTestN0 = 2;
+      document.removeEventListener('cut', override);
+      document.removeEventListener('copy', override);
+      document.addEventListener('cut', justCancel);
+      document.addEventListener('copy', justCancel);
+
+      allMechanisms(function() {
+        SimpleTest.finish();
+      }, null, true);
+    }, 'overridden');
+  });
+});