Make the night display suggestion depend on a flag.

This allows it to be enabled/disabled on certain devices.

Change-Id: I7b73bb866b05b92588e15ef7ffc2834cdde041ce
Fixes: 78601616
Test: Settings robotest

tests/robotests/src/com/android/settings/display/NightDisplayPreferenceControllerTest.java

@@ -6,15 +6,22 @@ import android.app.Application;
 import android.content.ComponentName;
 import android.provider.Settings.Secure;
 import com.android.internal.app.ColorDisplayController;
+import com.android.settings.R;
 import com.android.settings.Settings.NightDisplaySuggestionActivity;
 import com.android.settings.testutils.SettingsRobolectricTestRunner;
+import com.android.settings.testutils.shadow.SettingsShadowResources;
+
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
+import org.robolectric.annotation.Config;
 import org.robolectric.RuntimeEnvironment;
 
 @RunWith(SettingsRobolectricTestRunner.class)
+@Config(shadows = {
+        SettingsShadowResources.class
+})
 public class NightDisplayPreferenceControllerTest {
 
   private NightDisplayPreferenceController mPreferenceController;
@@ -27,6 +34,7 @@ public class NightDisplayPreferenceControllerTest {
   @After
   public void tearDown() {
     mPreferenceController = null;
+    SettingsShadowResources.reset();
   }
 
   @Test
@@ -58,4 +66,16 @@ public class NightDisplayPreferenceControllerTest {
         new ComponentName(context, NightDisplaySuggestionActivity.class);
     assertThat(mPreferenceController.isSuggestionComplete(context)).isTrue();
   }
+
+  @Test
+  public void nightDisplaySuggestion_isCompleted_ifDisabled() {
+    final Application context = RuntimeEnvironment.application;
+    Secure.putInt(context.getContentResolver(),
+            Secure.NIGHT_DISPLAY_AUTO_MODE, ColorDisplayController.AUTO_MODE_DISABLED);
+    SettingsShadowResources.overrideResource(R.bool.config_night_light_suggestion_enabled, false);
+
+    final ComponentName componentName =
+            new ComponentName(context, NightDisplaySuggestionActivity.class);
+    assertThat(mPreferenceController.isSuggestionComplete(context)).isTrue();
+  }
 }