diff -r 000000000000 -r 6474c204b198 browser/devtools/webconsole/test/browser_webconsole_bug_642615_autocomplete.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/webconsole/test/browser_webconsole_bug_642615_autocomplete.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,87 @@
+/* vim:set ts=2 sw=2 sts=2 et: */
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const TEST_URI = "data:text/html;charset=utf-8,<p>test for bug 642615";
+
+XPCOMUtils.defineLazyServiceGetter(this, "clipboardHelper",
+                                   "@mozilla.org/widget/clipboardhelper;1",
+                                   "nsIClipboardHelper");
+
+function consoleOpened(HUD) {
+  let jsterm = HUD.jsterm;
+  let stringToCopy = "foobazbarBug642615";
+
+  jsterm.clearOutput();
+
+  ok(!jsterm.completeNode.value, "no completeNode.value");
+
+  jsterm.setInputValue("doc");
+
+  let completionValue;
+
+  // wait for key "u"
+  function onCompletionValue() {
+    completionValue = jsterm.completeNode.value;
+
+    // Arguments: expected, setup, success, failure.
+    waitForClipboard(
+      stringToCopy,
+      function() {
+        clipboardHelper.copyString(stringToCopy, document);
+      },
+      onClipboardCopy,
+      finishTest);
+  }
+
+  function onClipboardCopy() {
+    info("wait for completion update after clipboard paste");
+    jsterm.once("autocomplete-updated", onClipboardPaste);
+
+    updateEditUIVisibility();
+    goDoCommand("cmd_paste");
+  }
+
+  function onClipboardPaste() {
+    ok(!jsterm.completeNode.value, "no completion value after paste");
+
+    info("wait for completion update after undo");
+    jsterm.once("autocomplete-updated", onCompletionValueAfterUndo);
+
+    // Get out of the webconsole event loop.
+    executeSoon(() => {
+      goDoCommand("cmd_undo");
+    });
+  }
+
+  function onCompletionValueAfterUndo() {
+    is(jsterm.completeNode.value, completionValue,
+       "same completeNode.value after undo");
+
+    info("wait for completion update after clipboard paste (ctrl-v)");
+    jsterm.once("autocomplete-updated", () => {
+      ok(!jsterm.completeNode.value, "no completion value after paste (ctrl-v)");
+
+      // using executeSoon() to get out of the webconsole event loop.
+      executeSoon(finishTest);
+    });
+
+    // Get out of the webconsole event loop.
+    executeSoon(() => {
+      EventUtils.synthesizeKey("v", {accelKey: true});
+    });
+  }
+
+  info("wait for completion value after typing 'docu'");
+  jsterm.once("autocomplete-updated", onCompletionValue);
+
+  EventUtils.synthesizeKey("u", {});
+}
+
+function test() {
+  addTab(TEST_URI);
+  browser.addEventListener("load", function onLoad() {
+    browser.removeEventListener("load", onLoad, true);
+    openConsole(null, consoleOpened);
+  }, true);
+}