[NTP Snippets] Schedule periodic fetching

chrome/android/javatests/src/org/chromium/chrome/browser/BackgroundSyncLauncherServiceTest.java

-// 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.
-
-package org.chromium.chrome.browser;
-
-import android.content.Context;
-import android.test.InstrumentationTestCase;
-import android.test.suitebuilder.annotation.SmallTest;
-
-import org.chromium.base.ThreadUtils;
-import org.chromium.base.metrics.RecordHistogram;
-import org.chromium.base.test.util.AdvancedMockContext;
-import org.chromium.base.test.util.Feature;
-
-/**
- * Tests {@link BackgroundSyncLauncherService}.
- */
-public class BackgroundSyncLauncherServiceTest extends InstrumentationTestCase {
-    private Context mContext;
-    private BackgroundSyncLauncher mLauncher;
-    private MockLauncherService mLauncherService;
-
-    static class MockLauncherService extends BackgroundSyncLauncherService {
-        private boolean mDidStartService = false;
-
-        @Override
-        protected void launchBrowser(Context context) {
-            mDidStartService = true;
-        }
-
-        // Posts an assertion task to the UI thread. Since this is only called after the call
-        // to onRunTask, it will be enqueued after any possible call to launchBrowser, and we
-        // can reliably check whether launchBrowser was called.
-        protected void checkExpectations(final boolean expectedStartService) {
-            ThreadUtils.runOnUiThread(new Runnable() {
-                @Override
-                public void run() {
-                    assertEquals("StartedService", expectedStartService, mDidStartService);
-                }
-            });
-        }
-    }
-
-    @Override
-    protected void setUp() throws Exception {
-        mContext = new AdvancedMockContext(getInstrumentation().getTargetContext());
-        BackgroundSyncLauncher.setGCMEnabled(false);
-        RecordHistogram.disableForTests();
-        mLauncher = BackgroundSyncLauncher.create(mContext);
-        mLauncherService = new MockLauncherService();
-    }
-
-    private void deleteLauncherInstance() {
-        mLauncher.destroy();
-        mLauncher = null;
-    }
-
-    private void startOnRunTaskAndVerify(boolean shouldStart) {
-        mLauncherService.onRunTask(null);
-        mLauncherService.checkExpectations(shouldStart);
-    }
-
-    @SmallTest
-    @Feature({"BackgroundSync"})
-    public void testNoFireWhenInstanceExists() {
-        startOnRunTaskAndVerify(false);
-    }
-
-    @SmallTest
-    @Feature({"BackgroundSync"})
-    public void testFiresWhenInstanceDoesNotExist() {
-        deleteLauncherInstance();
-        startOnRunTaskAndVerify(true);
-    }
-}