Merge "Add unit test for WallpaperService.Engine#getRenderingSurfaceControl" into main

import static org.junit.Assert.assertEquals;

import static org.junit.Assert.assertFalse;

import static org.junit.Assert.assertNull;

import static org.junit.Assert.assertTrue;

import androidx.test.filters.SmallTest;

        engine.notifyColorsChanged();

    }

    @Test

    public void testGetRenderingSurfaceControl() {

        WallpaperService service = new WallpaperService() {

            @Override

            public Engine onCreateEngine() {

                return new Engine();

            }

        };

        WallpaperService.Engine engine = service.onCreateEngine();

        // Before the engine's surface is created and updated, this field is expected to be null.

        // A full integration test would be required to verify the non-null case, as creating a

        // real SurfaceControl requires significant setup. This unit test verifies the getter's

        // basic functionality and initial state.

        assertNull("getRenderingSurfaceControl should return null before surface creation",

                engine.getRenderingSurfaceControl());

    }

}