Introduce unit tests for non-public VirtualDisplayConfig APIs

Bug: 261563516
Test: atest FrameworksCoreTests:VirtualDisplayConfigTest
Change-Id: Id807fb0c71a93fb5b32cbdac08e76fa829248cc6

core/java/android/hardware/display/VirtualDisplayConfig.java

@@ -161,9 +161,8 @@ public final class VirtualDisplayConfig implements Parcelable {
     }
 
     /**
-     * Returns the recording session associated with this VirtualDisplay. Only used for
+     * Returns the recording session associated with this {@link VirtualDisplay}. Only used for
      * recording via {@link MediaProjection}.
-     *
      * @hide
      */
     @Nullable

core/tests/coretests/src/android/hardware/display/VirtualDisplayConfigTest.java

@@ -0,0 +1,118 @@
+/*
+ * Copyright (C) 2023 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 android.hardware.display;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.graphics.SurfaceTexture;
+import android.os.Binder;
+import android.os.IBinder;
+import android.os.Parcel;
+import android.util.DisplayMetrics;
+import android.view.ContentRecordingSession;
+import android.view.Surface;
+
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.filters.SmallTest;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.util.Set;
+
+/**
+ * Tests for non-public APIs in {@link VirtualDisplayConfig}.
+ * See also related CTS tests.
+ *
+ * Run with:
+ * atest FrameworksCoreTests:VirtualDisplayConfigTest
+ */
+@SmallTest
+@RunWith(AndroidJUnit4.class)
+public class VirtualDisplayConfigTest {
+
+    private static final String NAME = "VirtualDisplayConfigTest";
+    private static final int WIDTH = 720;
+    private static final int HEIGHT = 480;
+    private static final int DENSITY = DisplayMetrics.DENSITY_MEDIUM;
+    private static final float REQUESTED_REFRESH_RATE = 30.0f;
+    private static final int FLAGS = DisplayManager.VIRTUAL_DISPLAY_FLAG_PUBLIC
+            | DisplayManager.VIRTUAL_DISPLAY_FLAG_SECURE;
+
+    // Values for hidden APIs.
+    private static final int DISPLAY_ID_TO_MIRROR = 10;
+    private static final IBinder WINDOW_TOKEN = new Binder("DisplayContentWindowToken");
+    private static final ContentRecordingSession CONTENT_RECORDING_SESSION =
+            ContentRecordingSession.createTaskSession(WINDOW_TOKEN);
+
+    private final Surface mSurface = new Surface(new SurfaceTexture(/*texName=*/1));
+
+    @Test
+    public void testParcelAndUnparcel_matches() {
+        final VirtualDisplayConfig originalConfig = buildGenericVirtualDisplay(NAME);
+
+        validateConstantFields(originalConfig);
+        assertThat(originalConfig.getName()).isEqualTo(NAME);
+
+
+        final Parcel parcel = Parcel.obtain();
+        originalConfig.writeToParcel(parcel, /* flags= */ 0);
+        parcel.setDataPosition(0);
+        final VirtualDisplayConfig recreatedConfig =
+                VirtualDisplayConfig.CREATOR.createFromParcel(parcel);
+
+        validateConstantFields(recreatedConfig);
+        assertThat(recreatedConfig.getName()).isEqualTo(NAME);
+    }
+
+    @Test
+    public void testEquals_matches() {
+        assertThat(buildGenericVirtualDisplay(NAME)).isEqualTo(buildGenericVirtualDisplay(NAME));
+    }
+
+    @Test
+    public void testEquals_different() {
+        assertThat(buildGenericVirtualDisplay(NAME + "2")).isNotEqualTo(
+                buildGenericVirtualDisplay(NAME));
+    }
+
+    private VirtualDisplayConfig buildGenericVirtualDisplay(String name) {
+        return new VirtualDisplayConfig.Builder(name, WIDTH, HEIGHT, DENSITY)
+                .setFlags(FLAGS)
+                .setSurface(mSurface)
+                .setDisplayCategories(Set.of("C1", "C2"))
+                .addDisplayCategory("C3")
+                .setRequestedRefreshRate(REQUESTED_REFRESH_RATE)
+                .setDisplayIdToMirror(DISPLAY_ID_TO_MIRROR)
+                .setWindowManagerMirroringEnabled(true)
+                .setContentRecordingSession(CONTENT_RECORDING_SESSION)
+                .build();
+    }
+
+    private void validateConstantFields(VirtualDisplayConfig config) {
+        assertThat(config.getWidth()).isEqualTo(WIDTH);
+        assertThat(config.getHeight()).isEqualTo(HEIGHT);
+        assertThat(config.getDensityDpi()).isEqualTo(DENSITY);
+        assertThat(config.getFlags()).isEqualTo(FLAGS);
+        assertThat(config.getSurface()).isNotNull();
+        assertThat(config.getDisplayCategories()).containsExactly("C1", "C2", "C3");
+        assertThat(config.getRequestedRefreshRate()).isEqualTo(REQUESTED_REFRESH_RATE);
+        assertThat(config.getDisplayIdToMirror()).isEqualTo(DISPLAY_ID_TO_MIRROR);
+        assertThat(config.isWindowManagerMirroringEnabled()).isTrue();
+        assertThat(config.getContentRecordingSession()).isEqualTo(CONTENT_RECORDING_SESSION);
+    }
+}