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gaia/apps/system/test/unit/settings_helper_test.js

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+/* global SettingsHelper, MockNavigatorSettings */
+'use strict';
+
+requireApp('system/shared/test/unit/mocks/mock_navigator_moz_settings.js');
+requireApp('system/shared/js/settings_helper.js');
+
+suite('SettingsHelper', function() {
+  var realMozSettings;
+  var SETTINGS_KEY = 'settings.key';
+
+  suiteSetup(function() {
+    realMozSettings = navigator.mozSettings;
+    navigator.mozSettings = MockNavigatorSettings;
+  });
+
+  suiteTeardown(function() {
+    navigator.mozSettings = realMozSettings;
+  });
+
+  teardown(function() {
+    MockNavigatorSettings.mTeardown();
+  });
+
+  test('Should be initialized correctly without mozSettings', function(done) {
+    // All settings should be the same as the specified default value
+    // when 'settings.key' is null.
+    var defaultValue = 'default_value';
+    var settingsHelper = SettingsHelper(SETTINGS_KEY, defaultValue);
+
+    settingsHelper.get(function(value) {
+      assert.equal(value, defaultValue);
+      done();
+    });
+  });
+
+  test('Should be initialized correctly with mozSettings', function(done) {
+    var defaultValue = 'default_value';
+    MockNavigatorSettings.mSettings[SETTINGS_KEY] = defaultValue;
+
+    var settingsHepler = SettingsHelper(SETTINGS_KEY);
+    settingsHepler.get(function(value) {
+      assert.equal(value, defaultValue);
+      done();
+    });
+  });
+
+  test('Should set to mozSettings with correct value', function(done) {
+    var setValue = 'set_value';
+    var settingsHepler = SettingsHelper(SETTINGS_KEY);
+
+    settingsHepler.set(setValue, function() {
+      assert.equal(MockNavigatorSettings.mSettings[SETTINGS_KEY], setValue);
+      done();
+    });
+  });
+
+  test('Shoule reflect mozSettings changes', function(done) {
+    var settingsHepler = SettingsHelper(SETTINGS_KEY, false);
+
+    settingsHepler.get(function(value) {
+      // Default false
+      assert.equal(value, false);
+
+      var obj = {};
+      obj[SETTINGS_KEY] = true;
+      var req = MockNavigatorSettings.createLock().set(obj);
+      req.onsuccess = function() {
+        settingsHepler.get(function(value) {
+          assert.equal(value, true);
+          done();
+        });
+      };
+    });
+  });
+});