diff -r 000000000000 -r 6474c204b198 browser/devtools/webconsole/test/browser_webconsole_output_order.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/webconsole/test/browser_webconsole_output_order.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,51 @@
+/* vim:set ts=2 sw=2 sts=2 et: */
+/* 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/. */
+
+// Tests that any output created from calls to the console API comes after the
+// echoed JavaScript.
+
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-console.html";
+
+function test() {
+  addTab(TEST_URI);
+  browser.addEventListener("load", function onLoad() {
+    browser.removeEventListener("load", onLoad, true);
+    openConsole(null, testOutputOrder);
+  }, true);
+}
+
+function testOutputOrder(hud) {
+  let jsterm = hud.jsterm;
+  let outputNode = jsterm.outputNode;
+
+  jsterm.clearOutput();
+  jsterm.execute("console.log('foo', 'bar');");
+
+  waitForMessages({
+    webconsole: hud,
+    messages: [{
+      text: "console.log('foo', 'bar');",
+      category: CATEGORY_INPUT,
+    },
+    {
+      text: "undefined",
+      category: CATEGORY_OUTPUT,
+    },
+    {
+      text: '"foo" "bar"',
+      category: CATEGORY_WEBDEV,
+      severity: SEVERITY_LOG,
+    }],
+  }).then(([function_call, result, console_message]) => {
+    let fncall_node = [...function_call.matched][0];
+    let result_node = [...result.matched][0];
+    let console_message_node = [...console_message.matched][0];
+    is(fncall_node.nextElementSibling, result_node,
+       "console.log() is followed by undefined");
+    is(result_node.nextElementSibling, console_message_node,
+       "undefined is followed by 'foo' 'bar'");
+    finishTest();
+  });
+}