diff -r 000000000000 -r 6474c204b198 browser/fuel/test/browser_ApplicationPrefs.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/fuel/test/browser_ApplicationPrefs.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,179 @@
+// The various properties that we'll be testing
+var testdata = {
+  missing: "fuel.fuel-test-missing",
+  dummy: "fuel.fuel-test",
+  string: "browser.active_color",
+  integer: "permissions.default.image",
+  boolean: "browser.underline_anchors"
+};
+
+function test() {
+  // test getting nonexistent values
+  var itemValue = Application.prefs.getValue(testdata.missing, "default");
+  is(itemValue, "default", "Check 'Application.prefs.getValue' for nonexistent item");
+
+  is(Application.prefs.get(testdata.missing), null, "Check 'Application.prefs.get' for nonexistent item");
+
+  // test setting and getting a value
+  Application.prefs.setValue(testdata.dummy, "dummy");
+  itemValue = Application.prefs.getValue(testdata.dummy, "default");
+  is(itemValue, "dummy", "Check 'Application.prefs.getValue' for existing item");
+
+  // test for overwriting an existing value
+  Application.prefs.setValue(testdata.dummy, "smarty");
+  itemValue = Application.prefs.getValue(testdata.dummy, "default");
+  is(itemValue, "smarty", "Check 'Application.prefs.getValue' for overwritten item");
+
+  // test setting and getting a value
+  Application.prefs.get(testdata.dummy).value = "dummy2";
+  itemValue = Application.prefs.get(testdata.dummy).value;
+  is(itemValue, "dummy2", "Check 'Application.prefs.get().value' for existing item");
+
+  // test resetting a pref [since there is no default value, the pref should disappear]
+  Application.prefs.get(testdata.dummy).reset();
+  itemValue = Application.prefs.getValue(testdata.dummy, "default");
+  is(itemValue, "default", "Check 'Application.prefs.getValue' for reset pref");
+
+  // test to see if a non-existant property exists
+  ok(!Application.prefs.has(testdata.dummy), "Check non-existant property for existence");
+
+  // PREF: string browser.active_color == #EE0000
+
+  // test to see if an existing string property exists
+  ok(Application.prefs.has(testdata.string), "Check existing string property for existence");
+
+  // test accessing a non-existant string property
+  var val = Application.prefs.getValue(testdata.dummy, "default");
+  is(val, "default", "Check non-existant string property for expected value");
+
+  // test accessing an existing string property
+  var val = Application.prefs.getValue(testdata.string, "default");
+  is(val, "#EE0000", "Check existing string property for expected value");
+
+  // test manipulating an existing string property
+  Application.prefs.setValue(testdata.string, "#EF0000");
+  var val = Application.prefs.getValue(testdata.string, "default");
+  is(val, "#EF0000", "Set existing string property");
+
+  // test getting the type of an existing string property
+  var type = Application.prefs.get(testdata.string).type;
+  is(type, "String", "Check 'Application.prefs.get().type' for string pref");
+
+  // test resetting an existing string property
+  Application.prefs.get(testdata.string).reset();
+  var val = Application.prefs.getValue(testdata.string, "default");
+  is(val, "#EE0000", "Reset existing string property");
+
+  // PREF: integer permissions.default.image == 1
+
+  // test to see if an existing integer property exists
+  ok(Application.prefs.has(testdata.integer), "Check existing integer property for existence");
+
+  // test accessing a non-existant integer property
+  var val = Application.prefs.getValue(testdata.dummy, 0);
+  is(val, 0, "Check non-existant integer property for expected value");
+
+  // test accessing an existing integer property
+  var val = Application.prefs.getValue(testdata.integer, 0);
+  is(val, 1, "Check existing integer property for expected value");
+
+  // test manipulating an existing integer property
+  Application.prefs.setValue(testdata.integer, 0);
+  var val = Application.prefs.getValue(testdata.integer, 1);
+  is(val, 0, "Set existing integer property");
+
+  // test getting the type of an existing integer property
+  var type = Application.prefs.get(testdata.integer).type;
+  is(type, "Number", "Check 'Application.prefs.get().type' for integer pref");
+
+  // test resetting an existing integer property
+  Application.prefs.get(testdata.integer).reset();
+  var val = Application.prefs.getValue(testdata.integer, 0);
+  is(val, 1, "Reset existing integer property");
+
+  // PREF: boolean browser.underline_anchors == true
+
+  // test to see if an existing boolean property exists
+  ok(Application.prefs.has(testdata.boolean), "Check existing boolean property for existence");
+
+  // test accessing a non-existant boolean property
+  var val = Application.prefs.getValue(testdata.dummy, true);
+  ok(val, "Check non-existant boolean property for expected value");
+
+  // test accessing an existing boolean property
+  var val = Application.prefs.getValue(testdata.boolean, false);
+  ok(val, "Check existing boolean property for expected value");
+
+  // test manipulating an existing boolean property
+  Application.prefs.setValue(testdata.boolean, false);
+  var val = Application.prefs.getValue(testdata.boolean, true);
+  ok(!val, "Set existing boolean property");
+
+  // test getting the type of an existing boolean property
+  var type = Application.prefs.get(testdata.boolean).type;
+  is(type, "Boolean", "Check 'Application.prefs.get().type' for boolean pref");
+
+  // test resetting an existing boolean property
+  Application.prefs.get(testdata.boolean).reset();
+  var val = Application.prefs.getValue(testdata.boolean, false);
+  ok(val, "Reset existing string property for expected value");
+
+  // test getting all preferences
+  var allPrefs = Application.prefs.all;
+  ok(allPrefs.length >= 800, "Check 'Application.prefs.all' for the right number of preferences");
+  ok(allPrefs[0].name.length > 0, "Check 'Application.prefs.all' for a valid name in the starting preference");
+
+  // test the value of the preference root
+  is(Application.prefs.root, "", "Check the Application preference root");
+
+  // test for user changed preferences
+  ok(Application.prefs.get("browser.shell.checkDefaultBrowser").modified, "A single preference is marked as modified.");
+  ok(!Application.prefs.get(testdata.string).modified, "A single preference is marked as not modified.");
+
+  // test for a locked preference
+  var pref = Application.prefs.get(testdata.string);
+  ok(!pref.locked, "A single preference should not be locked.");
+
+  pref.locked = true;
+  ok(pref.locked, "A single preference should be locked.");
+
+  try {
+    prev.value = "test value";
+
+    ok(false, "A locked preference could be modified.");
+  } catch(e){
+    ok(true, "A locked preference should not be able to be modified.");
+  }
+
+  pref.locked = false;
+  ok(!pref.locked, "A single preference is unlocked.");
+
+  // check for change event when setting a value
+  waitForExplicitFinish();
+  Application.prefs.events.addListener("change", onPrefChange);
+  Application.prefs.setValue("fuel.fuel-test", "change event");
+}
+
+function onPrefChange(evt) {
+  is(evt.data, testdata.dummy, "Check 'Application.prefs.setValue' fired a change event");
+  Application.prefs.events.removeListener("change", onPrefChange);
+
+  // We are removing the old listener after adding the new listener so we can test that
+  // removing a listener does not remove all listeners
+  Application.prefs.get("fuel.fuel-test").events.addListener("change", onPrefChangeDummy);
+  Application.prefs.get("fuel.fuel-test").events.addListener("change", onPrefChange2);
+  Application.prefs.get("fuel.fuel-test").events.removeListener("change", onPrefChangeDummy);
+
+  Application.prefs.setValue("fuel.fuel-test", "change event2");
+}
+
+function onPrefChange2(evt) {
+  is(evt.data, testdata.dummy, "Check 'Application.prefs.setValue' fired a change event for a single preference");
+  Application.prefs.events.removeListener("change", onPrefChange2);
+
+  finish();
+}
+
+function onPrefChangeDummy(evt) {
+  ok(false, "onPrefChangeDummy shouldn't be invoked!");
+}