Add unit tests for the Background Scheduler.

chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/BackgroundSchedulerTest.java

Index: chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/BackgroundSchedulerTest.java
diff --git a/chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/BackgroundSchedulerTest.java b/chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/BackgroundSchedulerTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..8c357117cfa689332e955cf85939a1424214fb45
--- /dev/null
+++ b/chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/BackgroundSchedulerTest.java
@@ -0,0 +1,52 @@
+// Copyright 2016 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.offlinepages;
+
+import static org.junit.Assert.assertNull;
+
+import android.content.Context;
+
+import org.chromium.base.BaseChromiumApplication;
+import org.chromium.base.test.util.Feature;
+import org.chromium.testing.local.LocalRobolectricTestRunner;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.Robolectric;
+import org.robolectric.annotation.Config;
+
+/**
+ * Unit tests for BackgroundScheduler.
+ */
+@RunWith(LocalRobolectricTestRunner.class)
+@Config(manifest = Config.NONE,
+        application = BaseChromiumApplication.class)
+public class BackgroundSchedulerTest {
+    private Context mContext;
+
+    @Before
+    public void setUp() throws Exception {
+        mContext =  Robolectric.application;
+    }
+
+    @Test
+    @Config(shadows = {ShadowGcmNetworkManager.class})
+    @Feature({"OfflinePages"})
+    public void testSchedule() {
+        BackgroundScheduler scheduler = new BackgroundScheduler();
+        assertNull(ShadowGcmNetworkManager.getScheduledTask());
+
+        // TODO(petewil): Re-enable the test when I track down why the GCMNetworkManager shadow is
+        // flaky.  I will need to call schedule, then assert that the shadow saw the scheduled task.
+
+        // TODO(petewil): Also assert that the date we see is what we expected
+    }
+
+    @Test
+    @Feature({"OfflinePages"})
+    public void testUnschedule() {
+        // TODO(petewil): Add this test.
+    }
+}