chrome/test/data/webui/settings/pref_util_tests.js

// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

/** @fileoverview Suite of tests for Settings.PrefUtil. */
cr.define('settings_prefUtil', function() {
  suite('PrefUtil', function() {
    const global = function() {
      return this;
    }();
    const origTraceAssertionsForTesting = global.traceAssertionsForTesting;

    /**
     * @param {function()} fn Function that should throw.
     * @param {string} message Message to log if function does not throw.
     */
    const expectThrows = function(fn, message) {
      // Temporarily disable printing of stack traces on assert failures.
      global.traceAssertionsForTesting = false;

      try {
        fn();
        // Must be expect, because assert would get caught.
        expectNotReached(message);
      } catch (e) {
      }

      global.traceAssertionsForTesting = origTraceAssertionsForTesting;
    };

    // Tests that the given value is converted to the expected value, for a
    // given prefType.
    const expectStringToPrefValue = function(value, prefType, expectedValue) {
      const pref = /** @type {PrefObject} */ ({type: prefType});
      expectEquals(
          expectedValue, Settings.PrefUtil.stringToPrefValue(value, pref));
    };

    test('stringToPrefValue', function testStringToPrefValue() {
      expectStringToPrefValue(
          'true', chrome.settingsPrivate.PrefType.BOOLEAN, true);

      expectStringToPrefValue(
          'false', chrome.settingsPrivate.PrefType.BOOLEAN, false);

      expectStringToPrefValue('42', chrome.settingsPrivate.PrefType.NUMBER, 42);

      expectStringToPrefValue(
          'Foo Bar', chrome.settingsPrivate.PrefType.STRING, 'Foo Bar');

      const url = 'http://example.com';
      expectStringToPrefValue(url, chrome.settingsPrivate.PrefType.URL, url);

      expectThrows(function() {
        expectStringToPrefValue(
            '[1, 2]', chrome.settingsPrivate.PrefType.LIST, '');
      }, 'List prefs should not be converted.');

      expectThrows(function() {
        expectStringToPrefValue(
            '{foo: 1}', chrome.settingsPrivate.PrefType.DICTIONARY, '');
      }, 'Dictionary prefs should not be converted.');
    });

    // Tests that the pref value is converted to the expected string, for a
    // given prefType.
    const expectPrefToString = function(prefType, prefValue, expectedValue) {
      const pref = /** @type {PrefObject} */ ({
        type: prefType,
        value: prefValue,
      });
      expectEquals(expectedValue, Settings.PrefUtil.prefToString(pref));
    };

    test('prefToString', function testPrefToString() {
      expectPrefToString(
          chrome.settingsPrivate.PrefType.BOOLEAN, false, 'false');

      expectPrefToString(chrome.settingsPrivate.PrefType.NUMBER, 42, '42');

      expectPrefToString(
          chrome.settingsPrivate.PrefType.STRING, 'Foo Bar', 'Foo Bar');

      const url = 'http://example.com';
      expectPrefToString(chrome.settingsPrivate.PrefType.URL, url, url);

      expectThrows(function() {
        expectPrefToString(chrome.settingsPrivate.PrefType.LIST, [1, 2], null);
      }, 'List prefs should not be handled.');

      expectThrows(function() {
        expectPrefToString(
            chrome.settingsPrivate.PrefType.DICTIONARY, {foo: 1}, null);
      }, 'Dictionary prefs should not be handled.');
    });
  });
});