Bump Robolectric to 4.8.1

shell/platform/android/test/README.md

@@ -1,6 +1,6 @@
 # Unit testing Java code
 
-All Java code in the engine should now be able to be tested with Robolectric 4.7.3
+All Java code in the engine should now be able to be tested with Robolectric 4.8.1
 and JUnit 4. The test suite has been added after the bulk of the Java code was
 first written, so most of these classes do not have existing tests. Ideally code
 after this point should be tested, either with unit tests here or with

shell/platform/android/test/io/flutter/plugin/platform/PlatformViewsControllerTest.java

@@ -9,6 +9,7 @@
 
 import android.content.Context;
 import android.content.res.AssetManager;
+import android.graphics.Canvas;
 import android.graphics.SurfaceTexture;
 import android.util.SparseArray;
 import android.view.MotionEvent;
@@ -51,6 +52,7 @@
 import org.robolectric.annotation.Config;
 import org.robolectric.annotation.Implementation;
 import org.robolectric.annotation.Implements;
+import org.robolectric.shadows.ShadowSurface;
 import org.robolectric.shadows.ShadowSurfaceView;
 
 @Config(manifest = Config.NONE)
@@ -469,7 +471,12 @@ public void disposeAndroidView__hybridComposition() {
   }
 
   @Test
-  @Config(shadows = {ShadowFlutterJNI.class, ShadowPlatformTaskQueue.class})
+  @Config(
+      shadows = {
+        ShadowFlutterJNI.class,
+        ShadowReleasedSurface.class,
+        ShadowPlatformTaskQueue.class
+      })
   public void disposeNullAndroidView() {
     PlatformViewsController platformViewsController = new PlatformViewsController();
 
@@ -489,6 +496,20 @@ public void disposeNullAndroidView() {
     attach(jni, platformViewsController);
 
     // Simulate create call from the framework.
+    // Before Robolectric 4.8, Surface#lockHardwareCanvas will throw exception at
+    // PlatformViewWrapper#setTexture, because Robolectric doesn't support to shadow
+    // Surface#lockHardwareCanvas, and it uses real Android logic with native pointer address is 0.
+    // This failure will ensure embeddedView's parent is null, because
+    // PlatformViewsController#createForTextureLayer will fail because of previous mentioned error,
+    // and PlatformViewsController#createForTextureLayer will not add embeddedView to wrapperView.
+    // So this test can pass. From Robolectric 4.8, it supports to shadow Surface#lockHardwareCanvas
+    // and it can pass with default true valid value, and
+    // PlatformViewsController#createForTextureLayer will run correctly and add embeddedView to
+    // wrapperView, and initializePlatformViewIfNeeded will fail because embeddedView's parent is
+    // not null. So adding a new shadow class called ShadowReleasedSurface to simulate previous
+    // Surface#lockHardwareCanvas failure to ensure this test can work with Robolectric 4.8 and
+    // later versions. But it is just a workaround, the root cause is this test case depends on
+    // just-failure behavior of Surface#lockHardwareCanvas in old Robolectric.
     createPlatformView(
         jni, platformViewsController, platformViewId, "testType", /* hybrid=*/ false);
     platformViewsController.initializePlatformViewIfNeeded(platformViewId);
@@ -1110,6 +1131,22 @@ public void dispatch(Runnable runnable) {
     }
   }
 
+  /**
+   * The shadow class of {@link Surface} to simulate released surface.
+   *
+   * <p>This shadow class's usage is restricted, not for normal purpose.
+   */
+  @Implements(Surface.class)
+  public static class ShadowReleasedSurface extends ShadowSurface {
+    public ShadowReleasedSurface() {}
+
+    @Implementation
+    @Override
+    protected Canvas lockHardwareCanvas() {
+      throw new IllegalStateException("Surface has already been released.");
+    }
+  }
+
   @Implements(FlutterJNI.class)
   public static class ShadowFlutterJNI {
     private static SparseArray<ByteBuffer> replies = new SparseArray<>();

shell/platform/android/test_runner/build.gradle

@@ -69,8 +69,7 @@ android {
     implementation files(project.property("flutter_jar"))
     testImplementation "androidx.test:core:1.4.0"
     testImplementation "com.google.android.play:core:1.8.0"
-    testImplementation "com.ibm.icu:icu4j:69.1"
-    testImplementation "org.robolectric:robolectric:4.7.3"
+    testImplementation "org.robolectric:robolectric:4.8.1"
     testImplementation "junit:junit:4.13"
     testImplementation "androidx.test.ext:junit:1.1.3"
 

shell/platform/android/test_runner/src/main/resources/robolectric.properties

@@ -1,2 +1,2 @@
-sdk=31
+sdk=32
 shadows=io.flutter.CustomShadowContextImpl