Setup AccessibilityButtonFragment test infrastructure

Bug: 197695932
Test: make RunSettingsRoboTests ROBOTEST_FILTER=AccessibilityButtonFragmentTest
Change-Id: I773579c8f2dcb0f8ebf154b584f8618f2ec1968b

tests/robotests/src/com/android/settings/accessibility/AccessibilityButtonFragmentTest.java

@@ -16,26 +16,83 @@
 
 package com.android.settings.accessibility;
 
+import static android.view.WindowManagerPolicyConstants.NAV_BAR_MODE_2BUTTON;
+import static android.view.WindowManagerPolicyConstants.NAV_BAR_MODE_GESTURAL;
+
 import static com.google.common.truth.Truth.assertThat;
 
-import android.content.Context;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.when;
 
+import android.content.Context;
+import android.content.res.Resources;
+import android.os.Bundle;
+
+import androidx.fragment.app.FragmentActivity;
+import androidx.preference.PreferenceManager;
+import androidx.preference.PreferenceScreen;
 import androidx.test.core.app.ApplicationProvider;
 
 import com.android.settings.R;
 import com.android.settings.testutils.XmlTestUtils;
+import com.android.settings.testutils.shadow.ShadowFragment;
 
+import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
+import org.mockito.Spy;
+import org.mockito.junit.MockitoJUnit;
+import org.mockito.junit.MockitoRule;
+import org.robolectric.Robolectric;
 import org.robolectric.RobolectricTestRunner;
+import org.robolectric.annotation.Config;
 
 import java.util.List;
 
 /** Tests for {@link AccessibilityButtonFragment}. */
+@Config(shadows = ShadowFragment.class)
 @RunWith(RobolectricTestRunner.class)
 public class AccessibilityButtonFragmentTest {
 
-    private Context mContext = ApplicationProvider.getApplicationContext();
+    @Rule
+    public MockitoRule mMockitoRule = MockitoJUnit.rule();
+    @Spy
+    private final Context mContext = ApplicationProvider.getApplicationContext();
+    @Spy
+    private Resources mResources = spy(mContext.getResources());
+    private AccessibilityButtonFragment mFragment;
+
+    @Before
+    public void setUp() {
+        mFragment = spy(new TestAccessibilityButtonFragment(mContext));
+        when(mFragment.getResources()).thenReturn(mResources);
+        when(mFragment.getActivity()).thenReturn(Robolectric.setupActivity(FragmentActivity.class));
+    }
+
+    @Test
+    public void onCreate_navigationGestureEnabled_setCorrectTitle() {
+        when(mResources.getInteger(com.android.internal.R.integer.config_navBarInteractionMode))
+                .thenReturn(NAV_BAR_MODE_GESTURAL);
+
+        mFragment.onAttach(mContext);
+        mFragment.onCreate(Bundle.EMPTY);
+
+        assertThat(mFragment.getActivity().getTitle().toString()).isEqualTo(
+                mContext.getString(R.string.accessibility_button_gesture_title));
+    }
+
+    @Test
+    public void onCreate_navigationGestureDisabled_setCorrectTitle() {
+        when(mResources.getInteger(com.android.internal.R.integer.config_navBarInteractionMode))
+                .thenReturn(NAV_BAR_MODE_2BUTTON);
+
+        mFragment.onAttach(mContext);
+        mFragment.onCreate(Bundle.EMPTY);
+
+        assertThat(mFragment.getActivity().getTitle().toString()).isEqualTo(
+                mContext.getString(R.string.accessibility_button_title));
+    }
 
     @Test
     public void getNonIndexableKeys_existInXmlLayout() {
@@ -47,4 +104,37 @@ public class AccessibilityButtonFragmentTest {
 
         assertThat(keys).containsAtLeastElementsIn(niks);
     }
+
+    private static class TestAccessibilityButtonFragment extends AccessibilityButtonFragment {
+
+        private final Context mContext;
+        private final PreferenceManager mPreferenceManager;
+
+        TestAccessibilityButtonFragment(Context context) {
+            super();
+            mContext = context;
+            mPreferenceManager = new PreferenceManager(context);
+            mPreferenceManager.setPreferences(mPreferenceManager.createPreferenceScreen(context));
+        }
+
+        @Override
+        public int getPreferenceScreenResId() {
+            return R.xml.placeholder_prefs;
+        }
+
+        @Override
+        public PreferenceScreen getPreferenceScreen() {
+            return mPreferenceManager.getPreferenceScreen();
+        }
+
+        @Override
+        public PreferenceManager getPreferenceManager() {
+            return mPreferenceManager;
+        }
+
+        @Override
+        public Context getContext() {
+            return mContext;
+        }
+    }
 }