Refactor help menu stuff into a controller

This is a clean up to action bar menu item pattern, we will use the same
pattern to build search icon on all pages in a later change.

Bug: 68814716
Test: robotests
Change-Id: Iedd3ec263e8ccb63ed75ec7a95b28c00878b1de4

tests/robotests/src/com/android/settings/support/actionbar/HelpMenuControllerTest.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.support.actionbar;
+
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+
+import android.content.Context;
+import android.os.Bundle;
+
+import com.android.settings.TestConfig;
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
+import com.android.settingslib.core.lifecycle.ObservablePreferenceFragment;
+
+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;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION_O)
+public class HelpMenuControllerTest {
+
+    @Mock
+    private Context mContext;
+    private TestFragment mHost;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        mHost = spy(new TestFragment());
+        doReturn(mContext).when(mHost).getContext();
+    }
+
+    @Test
+    public void onCreateOptionsMenu_withArgumentOverride_shouldPrepareHelpUsingOverride() {
+        final Bundle bundle = new Bundle();
+        bundle.putInt(HelpResourceProvider.HELP_URI_RESOURCE_KEY, 123);
+        mHost.setArguments(bundle);
+
+        HelpMenuController.init(mHost);
+
+        mHost.getLifecycle().onCreateOptionsMenu(null /* menu */, null /* inflater */);
+
+        verify(mContext).getString(123);
+
+    }
+
+    @Test
+    public void onCreateOptionsMenu_noArgumentOverride_shouldPrepareHelpUsingProvider() {
+        HelpMenuController.init(mHost);
+
+        mHost.getLifecycle().onCreateOptionsMenu(null /* menu */, null /* inflater */);
+
+        verify(mContext).getString(mHost.getHelpResource());
+    }
+
+
+    public static class TestFragment extends ObservablePreferenceFragment
+            implements HelpResourceProvider {
+
+        @Override
+        public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
+
+        }
+    }
+}