Move Magnification Mode Settings to the main page

We move the mode settings because currently there is
only one item in the settings page. To fully test all logic,
we don't use fragament anymore in the controllerTest, and
test the interaction between the controller and the fragment
in the test of these two fragments.

Bug: 182992338
Test: atest ToggleScreenMagnificationPreferenceFragmentTest
      atest MagnificationModePreferenceControllerTest
      atest MagnificationSettingsFragmentTest
      manually test
Change-Id: Ia6b0ea4f116f3215407637d7aeaddb8d8196d8fb

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

@@ -18,23 +18,78 @@ package com.android.settings.accessibility;
 
 import static com.google.common.truth.Truth.assertThat;
 
-import android.content.Context;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyInt;
+import static org.mockito.Mockito.RETURNS_DEEP_STUBS;
+import static org.mockito.Mockito.doReturn;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
 
+import android.content.Context;
+import android.os.Bundle;
+
+import androidx.fragment.app.FragmentManager;
+import androidx.preference.PreferenceScreen;
 import androidx.test.core.app.ApplicationProvider;
 
+import com.android.settings.DialogCreatable;
 import com.android.settings.R;
 import com.android.settings.testutils.XmlTestUtils;
+import com.android.settings.testutils.shadow.ShadowDashboardFragment;
 
+import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
+import org.mockito.Answers;
 import org.robolectric.RobolectricTestRunner;
+import org.robolectric.annotation.Config;
 
 import java.util.List;
 
 /** Tests for {@link MagnificationSettingsFragment} */
 @RunWith(RobolectricTestRunner.class)
+@Config(shadows = ShadowDashboardFragment.class)
 public class MagnificationSettingsFragmentTest {
+
     private final Context mContext = ApplicationProvider.getApplicationContext();
+    private MagnificationSettingsFragment mFragment;
+    private PreferenceScreen mScreen;
+
+    @Before
+    public void setup() {
+        mContext.setTheme(R.style.Theme_AppCompat);
+        mFragment = spy(new MagnificationSettingsFragment());
+        mScreen = new PreferenceScreen(mContext, null);
+
+        doReturn(mContext).when(mFragment).getContext();
+        doReturn(mScreen).when(mFragment).getPreferenceScreen();
+        doReturn(mock(FragmentManager.class, Answers.RETURNS_DEEP_STUBS)).when(
+                mFragment).getChildFragmentManager();
+
+    }
+
+    @Test
+    public void showPreferenceOnTheScreen_setDialogHelper() {
+        showPreferenceOnTheScreen(null);
+
+        verify(mFragment).setDialogDelegate(any(MagnificationModePreferenceController.class));
+    }
+
+    @Test
+    public void onCreateDialog_setDialogDelegate_invokeDialogDelegate() {
+        final DialogCreatable dialogDelegate = mock(DialogCreatable.class, RETURNS_DEEP_STUBS);
+        when(dialogDelegate.getDialogMetricsCategory(anyInt())).thenReturn(1);
+
+        mFragment.setDialogDelegate(dialogDelegate);
+
+        mFragment.onCreateDialog(1);
+        mFragment.getDialogMetricsCategory(1);
+
+        verify(dialogDelegate).onCreateDialog(1);
+        verify(dialogDelegate).getDialogMetricsCategory(1);
+    }
 
     @Test
     public void getNonIndexableKeys_existInXmlLayout() {
@@ -46,4 +101,10 @@ public class MagnificationSettingsFragmentTest {
                         R.xml.accessibility_magnification_service_settings);
         assertThat(keys).containsAtLeastElementsIn(niks);
     }
+
+    private void showPreferenceOnTheScreen(Bundle savedInstanceState) {
+        mFragment.onAttach(mContext);
+        mFragment.onCreate(savedInstanceState);
+        mFragment.onResume();
+    }
 }