Makes it possible to robo-test Settings app fragments.

This adds bunch of shadow/placeholder classes and logic to handle
references to Android internal resources or newly added classes/methods
that Robolectric hasn't yet picked up.

Developers can follow ManageApplicationsTest example to use the shadow
classes and the utility method to start ther fragment in their
robolectric tests.

Bug: 33431346
Test: This is a test improvement CL. RunSettingsRoboTests still passes.
Change-Id: I943ab871631cb8c368d9f9db481c00558c5c4d1f

tests/robotests/src/com/android/settings/applications/ManageApplicationsTest.java

@@ -0,0 +1,61 @@
+package com.android.settings.applications;
+
+import android.os.Looper;
+import android.os.UserManager;
+import com.android.settings.Settings;
+import com.android.settings.SettingsRobolectricTestRunner;
+import com.android.settings.TestConfig;
+import com.android.settings.testutils.shadow.ShadowDynamicIndexableContentMonitor;
+import com.android.settings.testutils.shadow.SettingsShadowResources;
+import com.android.settings.testutils.shadow.SettingsShadowResources.SettingsShadowTheme;
+import com.android.settingslib.applications.ApplicationsState;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.robolectric.annotation.Config;
+import org.robolectric.util.ReflectionHelpers;
+
+import static org.mockito.Matchers.any;
+import static org.mockito.Mockito.when;
+
+/**
+ * Tests for {@link ManageApplications}.
+ */
+@RunWith(SettingsRobolectricTestRunner.class)
+// TODO: Consider making the shadow class set global using a robolectric.properties file.
+@Config(manifest = TestConfig.MANIFEST_PATH,
+        sdk = TestConfig.SDK_VERSION,
+        shadows = {
+                SettingsShadowResources.class,
+                SettingsShadowTheme.class,
+                ShadowDynamicIndexableContentMonitor.class
+        })
+public class ManageApplicationsTest {
+
+    @Mock private ApplicationsState mState;
+    @Mock private ApplicationsState.Session mSession;
+    @Mock private UserManager mUserManager;
+
+    private Looper mBgLooper;
+
+    private ManageApplications mFragment;
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+
+        ReflectionHelpers.setStaticField(ApplicationsState.class, "sInstance", mState);
+        when(mState.newSession(any())).thenReturn(mSession);
+        mBgLooper = Looper.myLooper();
+        when(mState.getBackgroundLooper()).thenReturn(mBgLooper);
+
+        mFragment = new ManageApplications();
+    }
+
+    @Test
+    public void launchFragment() {
+        SettingsRobolectricTestRunner.startSettingsFragment(
+                mFragment, Settings.ManageApplicationsActivity.class);
+    }
+}