Refactoring Transaction_test continued

Bug: 140128949
Test: build, boot, SurfaceFlinger_test
Change-Id: Ibe0bdf04e1667051aa2126a676839cdcdbe7579d
diff --git a/services/surfaceflinger/tests/DereferenceSurfaceControl_test.cpp b/services/surfaceflinger/tests/DereferenceSurfaceControl_test.cpp
new file mode 100644
index 0000000..0cef0d1
--- /dev/null
+++ b/services/surfaceflinger/tests/DereferenceSurfaceControl_test.cpp
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2019 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.
+ */
+
+#include "LayerTransactionTest.h"
+namespace android {
+
+using android::hardware::graphics::common::V1_1::BufferUsage;
+
+::testing::Environment* const binderEnv =
+        ::testing::AddGlobalTestEnvironment(new BinderEnvironment());
+
+class DereferenceSurfaceControlTest : public LayerTransactionTest {
+protected:
+    void SetUp() override {
+        LayerTransactionTest::SetUp();
+        bgLayer = createLayer("BG layer", 20, 20);
+        fillBufferQueueLayerColor(bgLayer, Color::RED, 20, 20);
+        fgLayer = createLayer("FG layer", 20, 20);
+        fillBufferQueueLayerColor(fgLayer, Color::BLUE, 20, 20);
+        Transaction().setLayer(fgLayer, mLayerZBase + 1).apply();
+        {
+            SCOPED_TRACE("before anything");
+            auto shot = screenshot();
+            shot->expectColor(Rect(0, 0, 20, 20), Color::BLUE);
+        }
+    }
+    void TearDown() override {
+        LayerTransactionTest::TearDown();
+        bgLayer = 0;
+        fgLayer = 0;
+    }
+
+    sp<SurfaceControl> bgLayer;
+    sp<SurfaceControl> fgLayer;
+};
+
+TEST_F(DereferenceSurfaceControlTest, LayerNotInTransaction) {
+    fgLayer = nullptr;
+    {
+        SCOPED_TRACE("after setting null");
+        auto shot = screenshot();
+        shot->expectColor(Rect(0, 0, 20, 20), Color::RED);
+    }
+}
+
+TEST_F(DereferenceSurfaceControlTest, LayerInTransaction) {
+    auto transaction = Transaction().show(fgLayer);
+    fgLayer = nullptr;
+    {
+        SCOPED_TRACE("after setting null");
+        auto shot = screenshot();
+        shot->expectColor(Rect(0, 0, 20, 20), Color::BLUE);
+    }
+}
+
+} // namespace android