diff -r 000000000000 -r 6474c204b198 browser/devtools/commandline/test/browser_cmd_pref1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/commandline/test/browser_cmd_pref1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,154 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Tests that the pref commands work
+
+let prefBranch = Cc["@mozilla.org/preferences-service;1"]
+                    .getService(Ci.nsIPrefService).getBranch(null)
+                    .QueryInterface(Ci.nsIPrefBranch2);
+
+let settings = require("gcli/settings");
+
+const TEST_URI = "data:text/html;charset=utf-8,gcli-pref1";
+
+function test() {
+  return Task.spawn(spawnTest).then(finish, helpers.handleError);
+}
+
+function spawnTest() {
+  let options = yield helpers.openTab(TEST_URI);
+  yield helpers.openToolbar(options);
+
+  let tiltEnabledOrig = prefBranch.getBoolPref("devtools.tilt.enabled");
+  info("originally: devtools.tilt.enabled = " + tiltEnabledOrig);
+
+  yield helpers.audit(options, [
+    {
+      setup: 'pref',
+      check: {
+        input:  'pref',
+        hints:      ' reset',
+        markup: 'IIII',
+        status: 'ERROR'
+      },
+    },
+    {
+      setup: 'pref s',
+      check: {
+        input:  'pref s',
+        hints:        'et',
+        markup: 'IIIIVI',
+        status: 'ERROR'
+      },
+    },
+    {
+      setup: 'pref sh',
+      check: {
+        input:  'pref sh',
+        hints:         'ow',
+        markup: 'IIIIVII',
+        status: 'ERROR'
+      },
+    },
+    {
+      setup: 'pref show ',
+      check: {
+        input:  'pref show ',
+        markup: 'VVVVVVVVVV',
+        status: 'ERROR'
+      },
+    },
+    {
+      setup: 'pref show usetexttospeech',
+      check: {
+        input:  'pref show usetexttospeech',
+        hints:                           ' -> accessibility.usetexttospeech',
+        markup: 'VVVVVVVVVVIIIIIIIIIIIIIII',
+        status: 'ERROR'
+      },
+    },
+    {
+      setup: 'pref show devtools.til',
+      check: {
+        input:  'pref show devtools.til',
+        hints:                        't.enabled',
+        markup: 'VVVVVVVVVVIIIIIIIIIIII',
+        status: 'ERROR',
+        tooltipState: 'true:importantFieldFlag',
+        args: {
+          setting: { value: undefined, status: 'INCOMPLETE' },
+        }
+      },
+    },
+    {
+      setup: 'pref reset devtools.tilt.enabled',
+      check: {
+        input:  'pref reset devtools.tilt.enabled',
+        hints:                                  '',
+        markup: 'VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV',
+        status: 'VALID'
+      },
+    },
+    {
+      setup: 'pref show devtools.tilt.enabled 4',
+      check: {
+        input:  'pref show devtools.tilt.enabled 4',
+        hints:                                   '',
+        markup: 'VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVE',
+        status: 'ERROR'
+      },
+    },
+    {
+      setup: 'pref set devtools.tilt.enabled 4',
+      check: {
+        input:  'pref set devtools.tilt.enabled 4',
+        hints:                                  '',
+        markup: 'VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVE',
+        status: 'ERROR',
+        args: {
+          setting: { arg: ' devtools.tilt.enabled' },
+          value: { status: 'ERROR', message: 'Can\'t use \'4\'.' },
+        }
+      },
+    },
+    {
+      setup: 'pref set devtools.editor.tabsize 4',
+      check: {
+        input:  'pref set devtools.editor.tabsize 4',
+        hints:                                    '',
+        markup: 'VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV',
+        status: 'VALID',
+        args: {
+          setting: { arg: ' devtools.editor.tabsize' },
+          value: { value: 4 },
+        }
+      },
+    },
+    {
+      setup: 'pref list',
+      check: {
+        input:  'pref list',
+        hints:           ' -> pref set',
+        markup: 'IIIIVIIII',
+        status: 'ERROR'
+      },
+    },
+    {
+      setup: 'pref show devtools.tilt.enabled',
+      check: {
+        args: {
+          setting: { value: settings.getSetting("devtools.tilt.enabled") }
+        },
+      },
+      exec: {
+        output: "devtools.tilt.enabled: " + tiltEnabledOrig,
+      },
+      post: function() {
+        prefBranch.setBoolPref("devtools.tilt.enabled", tiltEnabledOrig);
+      }
+    },
+  ]);
+
+  yield helpers.closeToolbar(options);
+  yield helpers.closeTab(options);
+}