Refactor the various ways to control what users can do to extensions.

chrome/test/data/extensions/api_test/management/management_policy/prohibited.js

+// Copyright (c) 2012 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.
+
+var callback = chrome.test.callback;
+
+// The names of the extensions to operate on, from their manifest.json files.
+var ENABLED_NAME = 'enabled_extension';
+var DISABLED_NAME = 'disabled_extension';
+var UNINSTALL_NAME = 'enabled_extension';
+
+var EXPECTED_ERROR = 'Extension * cannot be modified by user';
+
+// Given a list of extension items, finds the one with the given name.
+function findByName(items, name) {
+  var item;
+  for (var i = 0; i < items.length; i++) {
+    item = items[i];
+    if (item.name == name)
+      break;
+  }
+  if (name != item.name)
+    chrome.test.fail('Couldn\'t find installed extension ' + name);
+  return item;
+}
+
+// Verifies that the extension with the given |id| has the expected |enabled|
+// status.
+function checkEnabled(id, enabled) {
+  chrome.management.get(id, callback(function(result) {
+    chrome.test.assertEq(enabled, result.enabled);
+  }));
+}
+
+var tests = [
+  // Tests disabling an extension, expecting it to fail.
+  function prohibitedDisable() {
+    chrome.management.getAll(callback(function(items) {
+      var item = findByName(items, ENABLED_NAME);
+      chrome.test.assertEq(false, item.mayDisable);
+      chrome.test.assertEq(true, item.enabled);
+
+      var id = item.id;
+      var expectedError = EXPECTED_ERROR.replace('*', id);
+      chrome.management.setEnabled(id, false,
+          callback(function() { checkEnabled(id, true); }, expectedError));
+    }));
+  },
+
+  // Tests enabling an extension, expecting it to fail.
+  function prohibitedEnable() {
+    chrome.management.getAll(callback(function(items) {
+      var item = findByName(items, DISABLED_NAME);
+      chrome.test.assertEq(false, item.mayDisable);
+      chrome.test.assertEq(false, item.enabled);
+
+      var id = item.id;
+      var expectedError = EXPECTED_ERROR.replace('*', id);
+      chrome.management.setEnabled(id, true,
+          callback(function() { checkEnabled(id, false); }, expectedError));
+    }));
+  },
+
+  // Tests uninstalling an extension, expecting it to fail.
+  function prohibitedUninstall() {
+    chrome.management.getAll(callback(function(items) {
+      var item = findByName(items, UNINSTALL_NAME);
+      chrome.test.assertEq(false, item.mayDisable);
+
+      var id = item.id;
+      var expectedError = EXPECTED_ERROR.replace('*', id);
+      chrome.management.uninstall(id,
+          callback(function() { checkEnabled(id, true); }, expectedError));
+    }));
+  }
+];
+
+chrome.test.runTests(tests);