Save most recent 3 destinations across multiple sessions

chrome/test/data/webui/print_preview.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.
 
 /**
  * Test fixture for print preview WebUI testing.
  * @constructor
  * @extends {testing.Test}
  */
 function PrintPreviewWebUITest() {
@@ skipping 334 matching lines @@
               height_microns: 279400,
               is_default: true
             }
           ]
         }
       }
     }
   };
 }
 
+// Test restore settings with one destination.
 TEST_F('PrintPreviewWebUITest', 'TestPrintPreviewRestoreLocalDestination',
     function() {
   this.initialSettings_.serializedAppStateStr_ =
-      '{"version":2,"selectedDestinationId":"ID",' +
-      '"selectedDestinationOrigin":"local"}';
+      '{"version":2,"recentDestinationIds":["ID"],' +
+      '"recentDestinationOrigins":["local"]}';
   this.setInitialSettings();
 
   testDone();
 });
 
+//Test with multiple destinations
+TEST_F('PrintPreviewWebUITest', 'TestPrintPreviewRestoreMultipleDestinations',
+    function() {
+  this.initialSettings_.serializedAppStateStr_ =
+      '{"version":2,"recentDestinationIds":["ID1", "ID2", "ID3"],' +
+      '"recentDestinationOrigins":["local", "local", "local"]}';
+  this.setInitialSettings();
+
+  // Set capabilities for the three recently used destinations + 1 more
+  this.setCapabilities(getCddTemplate('ID1'));
+  this.setCapabilities(getCddTemplate('ID2'));
+  this.setCapabilities(getCddTemplate('ID3'));
+  this.setCapabilities(getCddTemplate('ID4'));
+
+  // The most recently used destination should be the currently selected one.
+  // This is ID1.
+  assertEquals(
+      'ID1', printPreview.destinationStore_.selectedDestination.id);
+
+  // Look through the destinations. ID1, ID2, and ID3 should all be recent.
+  var destinations = printPreview.destinationStore_.destinations_;
+  var ids_found = [];
+
+  for (var i = 0; i < destinations.length; i++) {
+    if (!destinations[i])
+      continue;
+    if (destinations[i].isRecent)
+      ids_found.push(destinations[i].id);
+  }
+
+  // Make sure there were 3 recent destinations and that they are the correct
+  // IDs.
+  assertEquals(3, ids_found.length);
+  assertNotEquals(-1, ids_found.indexOf("ID1"));
+  assertNotEquals(-1, ids_found.indexOf("ID2"));
+  assertNotEquals(-1, ids_found.indexOf("ID3"));
+
+  testDone();
+});
+
 TEST_F('PrintPreviewWebUITest',
     'TestPrintPreviewDefaultDestinationSelectionRules', function() {
   // It also makes sure these rules do override system default destination.
   this.initialSettings_.serializedDefaultDestinationSelectionRulesStr_ =
       '{"namePattern":".*Bar.*"}';
   this.setInitialSettings();
   this.setLocalDestinations();
 
   assertEquals(
       'BarDevice', printPreview.destinationStore_.selectedDestination.id);
@@ skipping 718 matching lines @@
   // appears.
   var advancedSettingsCloseButton = $('advanced-settings').
       querySelector('.close-button');
   checkElementDisplayed(advancedSettingsCloseButton, true);
   checkElementDisplayed($('advanced-settings').
       querySelector('.search-box-area'), true);
 
   this.waitForAnimationToEnd('more-settings');
 });