[Android] Sort custom search engines based on last visited time and display only top 3 most recentl…

chrome/android/javatests/src/org/chromium/chrome/browser/search_engines/TemplateUrlServiceTest.java

 // Copyright 2013 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.
 
 package org.chromium.chrome.browser.search_engines;
 
 import android.net.Uri;
 import android.test.suitebuilder.annotation.SmallTest;
 
 import org.chromium.base.ThreadUtils;
@@ skipping 136 matching lines @@
         });
         searchEngineKeyword = ThreadUtils.runOnUiThreadBlockingNoException(new Callable<String>() {
             @Override
             public String call() throws Exception {
                 return templateUrlService.getDefaultSearchEngineTemplateUrl().getKeyword();
             }
         });
         assertEquals(searchEngines.get(1).getKeyword(), searchEngineKeyword);
     }
 
+    @SmallTest
+    @Feature({"SearchEngines"})
+    public void testSortandGetCustomSearchEngine() {
+        final TemplateUrlService templateUrlService = waitForTemplateUrlServiceToLoad();
+
+        // Get the number of prepopulated search engine.
+        final int prepopulatedEngineNum =
+                ThreadUtils.runOnUiThreadBlockingNoException(new Callable<Integer>() {
+                    @Override
+                    public Integer call() throws Exception {
+                        return templateUrlService.getSearchEngines().size();
+                    }
+                });
+
+        // Add custom search engines and verified only engines visited within 2 days are added.
+        // Also verified custom engines are sorted correctly.
+        List<TemplateUrl> customSearchEngines =
+                ThreadUtils.runOnUiThreadBlockingNoException(new Callable<List<TemplateUrl>>() {
+                    @Override
+                    public List<TemplateUrl> call() throws Exception {
+                        templateUrlService.addSearchEngineForTesting("keyword1", 0);
+                        templateUrlService.addSearchEngineForTesting("keyword2", 0);
+                        templateUrlService.addSearchEngineForTesting("keyword3", 3);
+                        List<TemplateUrl> searchEngines = templateUrlService.getSearchEngines();
+                        return searchEngines.subList(prepopulatedEngineNum, searchEngines.size());
+                    }
+                });
+        assertEquals(2, customSearchEngines.size());
+        assertEquals("keyword2", customSearchEngines.get(0).getKeyword());
+        assertEquals("keyword1", customSearchEngines.get(1).getKeyword());
+
+        // Add more custom search engines and verified at most 3 custom engines are returned.
+        // Also verified custom engines are sorted correctly.
+        customSearchEngines =
+                ThreadUtils.runOnUiThreadBlockingNoException(new Callable<List<TemplateUrl>>() {
+                    @Override
+                    public List<TemplateUrl> call() throws Exception {
+                        templateUrlService.addSearchEngineForTesting("keyword4", 0);
+                        templateUrlService.addSearchEngineForTesting("keyword5", 0);
+                        List<TemplateUrl> searchEngines = templateUrlService.getSearchEngines();
+                        return searchEngines.subList(prepopulatedEngineNum, searchEngines.size());
+                    }
+                });
+        assertEquals(3, customSearchEngines.size());
+        assertEquals("keyword5", customSearchEngines.get(0).getKeyword());
+        assertEquals("keyword4", customSearchEngines.get(1).getKeyword());
+        assertEquals("keyword2", customSearchEngines.get(2).getKeyword());
+
+        // Verified last_visited is updated correctly and sorting in descending order correctly.
+        customSearchEngines =
+                ThreadUtils.runOnUiThreadBlockingNoException(new Callable<List<TemplateUrl>>() {
+                    @Override
+                    public List<TemplateUrl> call() throws Exception {
+                        templateUrlService.updateLastVisitedForTesting("keyword3");
+                        List<TemplateUrl> searchEngines = templateUrlService.getSearchEngines();
+                        return searchEngines.subList(prepopulatedEngineNum, searchEngines.size());
+                    }
+                });
+        assertEquals(3, customSearchEngines.size());
+        assertEquals("keyword3", customSearchEngines.get(0).getKeyword());
+        assertEquals("keyword5", customSearchEngines.get(1).getKeyword());
+        assertEquals("keyword4", customSearchEngines.get(2).getKeyword());
+
+        // Set a custom engine as default provider and verified still 3 custom engines are returned.
+        // Also verified custom engines are sorted correctly.
+        customSearchEngines =
+                ThreadUtils.runOnUiThreadBlockingNoException(new Callable<List<TemplateUrl>>() {
+                    @Override
+                    public List<TemplateUrl> call() throws Exception {
+                        templateUrlService.setSearchEngine("keyword4");
+                        List<TemplateUrl> searchEngines = templateUrlService.getSearchEngines();
+                        return searchEngines.subList(prepopulatedEngineNum, searchEngines.size());
+                    }
+                });
+        assertEquals(4, customSearchEngines.size());
+        assertEquals("keyword4", customSearchEngines.get(0).getKeyword());
+        assertEquals("keyword3", customSearchEngines.get(1).getKeyword());
+        assertEquals("keyword5", customSearchEngines.get(2).getKeyword());
+        assertEquals("keyword2", customSearchEngines.get(3).getKeyword());
+    }
+
     private TemplateUrlService waitForTemplateUrlServiceToLoad() {
         final AtomicBoolean observerNotified = new AtomicBoolean(false);
         final LoadListener listener = new LoadListener() {
             @Override
             public void onTemplateUrlServiceLoaded() {
                 observerNotified.set(true);
             }
         };
         final TemplateUrlService templateUrlService = ThreadUtils.runOnUiThreadBlockingNoException(
                 new Callable<TemplateUrlService>() {
                     @Override
                     public TemplateUrlService call() {
                         TemplateUrlService service = TemplateUrlService.getInstance();
                         service.registerLoadListener(listener);
                         service.load();
                         return service;
                     }
                 });
 
         CriteriaHelper.pollInstrumentationThread(new Criteria(
                 "Observer wasn't notified of TemplateUrlService load.") {
             @Override
             public boolean isSatisfied() {
                 return observerNotified.get();
             }
         });
         return templateUrlService;
     }
 }