diff -r 000000000000 -r 6474c204b198 browser/devtools/webconsole/test/browser_webconsole_bug_664131_console_group.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/webconsole/test/browser_webconsole_bug_664131_console_group.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,79 @@
+/* vim:set ts=2 sw=2 sts=2 et: */
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+// Tests that console.group/groupEnd works as intended.
+const TEST_URI = "data:text/html;charset=utf-8,Web Console test for bug 664131: Expand console object with group methods";
+
+function test() {
+  Task.spawn(runner).then(finishTest);
+
+  function* runner() {
+    let {tab} = yield loadTab(TEST_URI);
+    let hud = yield openConsole(tab);
+    let outputNode = hud.outputNode;
+
+    hud.jsterm.clearOutput();
+
+    content.console.group("bug664131a");
+
+    yield waitForMessages({
+      webconsole: hud,
+      messages: [{
+        text: "bug664131a",
+        consoleGroup: 1,
+      }],
+    });
+
+    content.console.log("bug664131a-inside");
+
+    yield waitForMessages({
+      webconsole: hud,
+      messages: [{
+        text: "bug664131a-inside",
+        category: CATEGORY_WEBDEV,
+        severity: SEVERITY_LOG,
+        groupDepth: 1,
+      }],
+    });
+
+    content.console.groupEnd("bug664131a");
+    content.console.log("bug664131-outside");
+
+    yield waitForMessages({
+      webconsole: hud,
+      messages: [{
+        text: "bug664131-outside",
+        category: CATEGORY_WEBDEV,
+        severity: SEVERITY_LOG,
+        groupDepth: 0,
+      }],
+    });
+
+    content.console.groupCollapsed("bug664131b");
+
+    yield waitForMessages({
+      webconsole: hud,
+      messages: [{
+        text: "bug664131b",
+        consoleGroup: 1,
+      }],
+    });
+
+    // Test that clearing the console removes the indentation.
+    hud.jsterm.clearOutput();
+    content.console.log("bug664131-cleared");
+
+    yield waitForMessages({
+      webconsole: hud,
+      messages: [{
+        text: "bug664131-cleared",
+        category: CATEGORY_WEBDEV,
+        severity: SEVERITY_LOG,
+        groupDepth: 0,
+      }],
+    });
+  }
+}