diff -r 000000000000 -r 6474c204b198 browser/devtools/styleinspector/test/browser_ruleview_add-property-cancel_01.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/styleinspector/test/browser_ruleview_add-property-cancel_01.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,55 @@
+/* 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";
+
+// Testing various inplace-editor behaviors in the rule-view
+
+let TEST_URL = 'url("' + TEST_URL_ROOT + 'doc_test_image.png")';
+let PAGE_CONTENT = [
+  '<style type="text/css">',
+  '  #testid {',
+  '    background-color: blue;',
+  '  }',
+  '  .testclass {',
+  '    background-color: green;',
+  '  }',
+  '</style>',
+  '<div id="testid" class="testclass">Styled Node</div>'
+].join("\n");
+
+let test = asyncTest(function*() {
+  yield addTab("data:text/html,test rule view user changes");
+
+  info("Creating the test document");
+  content.document.body.innerHTML = PAGE_CONTENT;
+
+  info("Opening the rule-view");
+  let {toolbox, inspector, view} = yield openRuleView();
+
+  info("Selecting the test element");
+  yield selectNode("#testid", inspector);
+
+  yield testCancelNew(view);
+});
+
+function* testCancelNew(view) {
+  info("Test adding a new rule to the element's style declaration and leaving it empty.");
+
+  let elementRuleEditor = view.element.children[0]._ruleEditor;
+
+  info("Focusing a new property name in the rule-view");
+  let editor = yield focusEditableField(elementRuleEditor.closeBrace);
+  is(inplaceEditor(elementRuleEditor.newPropSpan), editor, "The new property editor got focused");
+
+  info("Bluring the editor input");
+  let onBlur = once(editor.input, "blur");
+  editor.input.blur();
+  yield onBlur;
+
+  info("Checking the state of canceling a new property name editor");
+  ok(!elementRuleEditor.rule._applyingModifications, "Shouldn't have an outstanding 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.");
+}