diff -r 000000000000 -r 6474c204b198 browser/devtools/markupview/test/helper_outerhtml_test_runner.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/markupview/test/helper_outerhtml_test_runner.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,81 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * Run a series of edit-outer-html tests.
+ * This function will iterate over the provided tests array and run each test.
+ * Each test's goal is to provide a node (a selector) and a new outer-HTML to be
+ * inserted in place of the current one for that node.
+ * This test runner will wait for the mutation event to be fired and will check
+ * a few things. Each test may also provide its own validate function to perform
+ * assertions and verify that the new outer html is correct.
+ * @param {Array} tests See runEditOuterHTMLTest for the structure
+ * @param {InspectorPanel} inspector The instance of InspectorPanel currently
+ * opened
+ * @return a promise that resolves when the tests have run
+ */
+function runEditOuterHTMLTests(tests, inspector) {
+  info("Running " + tests.length + " edit-outer-html tests");
+  return Task.spawn(function* () {
+    for (let step of TEST_DATA) {
+      yield runEditOuterHTMLTest(step, inspector);
+    }
+  });
+}
+
+/**
+ * Run a single edit-outer-html test.
+ * See runEditOuterHTMLTests for a description.
+ * @param {Object} test A test object should contain the following properties:
+ *        - selector {String} a css selector targeting the node to edit
+ *        - oldHTML {String}
+ *        - newHTML {String}
+ *        - validate {Function} will be executed when the edition test is done,
+ *        after the new outer-html has been inserted. Should be used to verify
+ *        the actual DOM, see if it corresponds to the newHTML string provided
+ * @param {InspectorPanel} inspector The instance of InspectorPanel currently
+ * opened
+ */
+function* runEditOuterHTMLTest(test, inspector) {
+  info("Running an edit outerHTML test on '" + test.selector + "'");
+  yield selectNode(test.selector, inspector);
+  let oldNodeFront = inspector.selection.nodeFront;
+
+  info("Listening for the markupmutation event");
+  // This event fires once the outerHTML is set, with a target as the parent node and a type of "childList".
+  let mutated = inspector.once("markupmutation");
+  info("Editing the outerHTML");
+  inspector.markup.updateNodeOuterHTML(inspector.selection.nodeFront, test.newHTML, test.oldHTML);
+  let mutations = yield mutated;
+  ok(true, "The markupmutation event has fired, mutation done");
+
+  info("Check to make the sure the correct mutation event was fired, and that the parent is selected");
+  let nodeFront = inspector.selection.nodeFront;
+  let mutation = mutations[0];
+  let isFromOuterHTML = mutation.removed.some(n => n === oldNodeFront);
+
+  ok(isFromOuterHTML, "The node is in the 'removed' list of the mutation");
+  is(mutation.type, "childList", "Mutation is a childList after updating outerHTML");
+  is(mutation.target, nodeFront, "Parent node is selected immediately after setting outerHTML");
+
+  // Wait for node to be reselected after outerHTML has been set
+  yield inspector.selection.once("new-node");
+
+  // Typically selectedNode will === pageNode, but if a new element has been injected in front
+  // of it, this will not be the case.  If this happens.
+  let selectedNode = inspector.selection.node;
+  let nodeFront = inspector.selection.nodeFront;
+  let pageNode = getNode(test.selector);
+
+  if (test.validate) {
+    test.validate(pageNode, selectedNode);
+  } else {
+    is(pageNode, selectedNode, "Original node (grabbed by selector) is selected");
+    is(pageNode.outerHTML, test.newHTML, "Outer HTML has been updated");
+  }
+
+  // Wait for the inspector to be fully updated to avoid causing errors by
+  // abruptly closing hanging requests when the test ends
+  yield inspector.once("inspector-updated");
+}