[flexiglass] Screenshot tests for bouncer scene.

Bug: 304630105
Test: N/A this is a test
Flag: NONE
Change-Id: I6ae5649457b40a8b2b83b02fd4524778b7b9a871

packages/SystemUI/compose/scene/tests/utils/src/com/android/compose/animation/scene/TestSceneScope.kt

+/*
+ * 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 com.android.compose.animation.scene
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Modifier
+
+/** `SceneScope` for tests, which allows a single scene to be drawn in a [SceneTransitionLayout]. */
+@Composable
+fun TestSceneScope(
+    modifier: Modifier = Modifier,
+    content: @Composable SceneScope.() -> Unit,
+) {
+    val currentScene = remember { SceneKey("current") }
+    SceneTransitionLayout(
+        currentScene,
+        onChangeScene = { /* do nothing */},
+        transitions = remember { transitions {} },
+        modifier,
+    ) {
+        scene(currentScene, content = content)
+    }
+}

packages/SystemUI/tests/utils/src/com/android/systemui/scene/SceneTestUtils.kt

@@ -16,6 +16,7 @@
 
 package com.android.systemui.scene
 
+import android.content.Context
 import android.content.pm.UserInfo
 import android.graphics.Bitmap
 import android.graphics.drawable.BitmapDrawable
@@ -81,8 +82,10 @@ import kotlinx.coroutines.test.currentTime
  */
 @OptIn(ExperimentalCoroutinesApi::class)
 class SceneTestUtils(
-    test: SysuiTestCase,
+    private val context: Context,
 ) {
+    constructor(test: SysuiTestCase) : this(context = test.context)
+
     val kosmos = Kosmos()
     val testDispatcher = kosmos.testDispatcher
     val testScope = kosmos.testScope
@@ -115,8 +118,6 @@ class SceneTestUtils(
         }
     }
 
-    private val context = test.context
-
     private val falsingCollectorFake: FalsingCollector by lazy { FalsingCollectorFake() }
     private var falsingInteractor: FalsingInteractor? = null