diff -r 000000000000 -r 6474c204b198 browser/devtools/styleinspector/test/browser_ruleview_add-property-cancel_03.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/styleinspector/test/browser_ruleview_add-property-cancel_03.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,68 @@
+/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test cancelling the addition of a new property in the rule-view
+
+let test = asyncTest(function*() {
+  yield addTab("data:text/html;charset=utf-8,browser_ruleview_ui.js");
+  let {toolbox, inspector, view} = yield openRuleView();
+
+  info("Creating the test document");
+  let style = "" +
+    "#testid {" +
+    "  background-color: blue;" +
+    "}" +
+    ".testclass, .unmatched {" +
+    "  background-color: green;" +
+    "}";
+  let styleNode = addStyle(content.document, style);
+  content.document.body.innerHTML = "<div id='testid' class='testclass'>Styled Node</div>" +
+                                    "<div id='testid2'>Styled Node</div>";
+
+  yield testCancelNew(inspector, view);
+  yield testCancelNewOnEscape(inspector, view);
+  yield inspector.once("inspector-updated");
+});
+
+function* testCancelNew(inspector, ruleView) {
+  // Start at the beginning: start to add a rule to the element's style
+  // declaration, but leave it empty.
+
+  let elementRuleEditor = ruleView.element.children[0]._ruleEditor;
+  let editor = yield focusEditableField(elementRuleEditor.closeBrace);
+
+  is(inplaceEditor(elementRuleEditor.newPropSpan), editor,
+    "Property editor is focused");
+
+  let onBlur = once(editor.input, "blur");
+  editor.input.blur();
+  yield onBlur;
+
+  ok(!elementRuleEditor.rule._applyingModifications, "Shouldn't have an outstanding modification request after a cancel.");
+  is(elementRuleEditor.rule.textProps.length, 0, "Should have canceled creating a new text property.");
+  ok(!elementRuleEditor.propertyList.hasChildNodes(), "Should not have any properties.");
+}
+
+function* testCancelNewOnEscape(inspector, ruleView) {
+  // Start at the beginning: start to add a rule to the element's style
+  // declaration, add some text, then press escape.
+
+  let elementRuleEditor = ruleView.element.children[0]._ruleEditor;
+  let editor = yield focusEditableField(elementRuleEditor.closeBrace);
+
+  is(inplaceEditor(elementRuleEditor.newPropSpan), editor, "Next focused editor should be the new property editor.");
+  for (let ch of "background") {
+    EventUtils.sendChar(ch, ruleView.doc.defaultView);
+  }
+
+  let onBlur = once(editor.input, "blur");
+  EventUtils.synthesizeKey("VK_ESCAPE", {});
+  yield onBlur;
+
+  ok(!elementRuleEditor.rule._applyingModifications, "Shouldn't have an outstanding modification request after a cancel.");
+  is(elementRuleEditor.rule.textProps.length, 0, "Should have canceled creating a new text property.");
+  ok(!elementRuleEditor.propertyList.hasChildNodes(), "Should not have any properties.");
+}