diff -r 000000000000 -r 6474c204b198 browser/devtools/layoutview/test/browser_editablemodel_stylerules.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/layoutview/test/browser_editablemodel_stylerules.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,109 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function getStyle(node, property) {
+  return node.style.getPropertyValue(property);
+}
+
+let doc;
+let inspector;
+
+let test = asyncTest(function*() {
+  let style = "div { margin: 10px; padding: 3px } #div1 { margin-top: 5px } #div2 { border-bottom: 1em solid black; } #div3 { padding: 2em; }";
+  let html = "<style>" + style + "</style><div id='div1'></div><div id='div2'></div><div id='div3'></div>"
+
+  let content = yield loadTab("data:text/html," + encodeURIComponent(html));
+  doc = content.document;
+
+  let target = TargetFactory.forTab(gBrowser.selectedTab);
+  let toolbox = yield gDevTools.showToolbox(target, "inspector");
+  inspector = toolbox.getCurrentPanel();
+
+  inspector.sidebar.select("layoutview");
+  yield inspector.sidebar.once("layoutview-ready");
+  yield runTests();
+  // TODO: Closing the toolbox in this test leaks - bug 994314
+  // yield gDevTools.closeToolbox(target);
+});
+
+addTest("Test that entering units works",
+function*() {
+  let node = doc.getElementById("div1");
+  is(getStyle(node, "padding-top"), "", "Should have the right padding");
+  let view = yield selectNode(node);
+
+  let span = view.document.querySelector(".padding.top > span");
+  is(span.textContent, 3, "Should have the right value in the box model.");
+
+  EventUtils.synthesizeMouseAtCenter(span, {}, view);
+  let editor = view.document.querySelector(".styleinspector-propertyeditor");
+  ok(editor, "Should have opened the editor.");
+  is(editor.value, "3px", "Should have the right value in the editor.");
+
+  EventUtils.synthesizeKey("1", {}, view);
+  yield waitForUpdate();
+  EventUtils.synthesizeKey("e", {}, view);
+  yield waitForUpdate();
+
+  is(getStyle(node, "padding-top"), "", "An invalid value is handled cleanly");
+
+  EventUtils.synthesizeKey("m", {}, view);
+  yield waitForUpdate();
+
+  is(editor.value, "1em", "Should have the right value in the editor.");
+  is(getStyle(node, "padding-top"), "1em", "Should have updated the padding.");
+
+  EventUtils.synthesizeKey("VK_RETURN", {}, view);
+  yield waitForUpdate();
+
+  is(getStyle(node, "padding-top"), "1em", "Should be the right padding.")
+  is(span.textContent, 16, "Should have the right value in the box model.");
+});
+
+addTest("Test that we pick up the value from a higher style rule",
+function*() {
+  let node = doc.getElementById("div2");
+  is(getStyle(node, "border-bottom-width"), "", "Should have the right border-bottom-width");
+  let view = yield selectNode(node);
+
+  let span = view.document.querySelector(".border.bottom > span");
+  is(span.textContent, 16, "Should have the right value in the box model.");
+
+  EventUtils.synthesizeMouseAtCenter(span, {}, view);
+  let editor = view.document.querySelector(".styleinspector-propertyeditor");
+  ok(editor, "Should have opened the editor.");
+  is(editor.value, "1em", "Should have the right value in the editor.");
+
+  EventUtils.synthesizeKey("0", {}, view);
+  yield waitForUpdate();
+
+  is(editor.value, "0", "Should have the right value in the editor.");
+  is(getStyle(node, "border-bottom-width"), "0px", "Should have updated the border.");
+
+  EventUtils.synthesizeKey("VK_RETURN", {}, view);
+  yield waitForUpdate();
+
+  is(getStyle(node, "border-bottom-width"), "0px", "Should be the right border-bottom-width.")
+  is(span.textContent, 0, "Should have the right value in the box model.");
+});
+
+addTest("Test that shorthand properties are parsed correctly",
+function*() {
+  let node = doc.getElementById("div3");
+  is(getStyle(node, "padding-right"), "", "Should have the right padding");
+  let view = yield selectNode(node);
+
+  let span = view.document.querySelector(".padding.right > span");
+  is(span.textContent, 32, "Should have the right value in the box model.");
+
+  EventUtils.synthesizeMouseAtCenter(span, {}, view);
+  let editor = view.document.querySelector(".styleinspector-propertyeditor");
+  ok(editor, "Should have opened the editor.");
+  is(editor.value, "2em", "Should have the right value in the editor.");
+
+  EventUtils.synthesizeKey("VK_RETURN", {}, view);
+  yield waitForUpdate();
+
+  is(getStyle(node, "padding-right"), "", "Should be the right padding.")
+  is(span.textContent, 32, "Should have the right value in the box model.");
+});