diff --git a/services/surfaceflinger/tests/unittests/Android.bp b/services/surfaceflinger/tests/unittests/Android.bp
index 68adbfc..23fa940 100644
--- a/services/surfaceflinger/tests/unittests/Android.bp
+++ b/services/surfaceflinger/tests/unittests/Android.bp
@@ -49,6 +49,7 @@
         "SchedulerTest.cpp",
         "SchedulerUtilsTest.cpp",
         "RefreshRateConfigsTest.cpp",
+        "RefreshRateSelectionTest.cpp",
         "RefreshRateStatsTest.cpp",
         "RegionSamplingTest.cpp",
         "TimeStatsTest.cpp",
diff --git a/services/surfaceflinger/tests/unittests/LayerHistoryTest.cpp b/services/surfaceflinger/tests/unittests/LayerHistoryTest.cpp
index f055fe7..b584838 100644
--- a/services/surfaceflinger/tests/unittests/LayerHistoryTest.cpp
+++ b/services/surfaceflinger/tests/unittests/LayerHistoryTest.cpp
@@ -64,6 +64,7 @@
 TEST_F(LayerHistoryTest, oneLayer) {
     const auto layer = createLayer();
     EXPECT_CALL(*layer, isVisible()).WillRepeatedly(Return(true));
+    EXPECT_CALL(*layer, getFrameSelectionPriority()).WillRepeatedly(Return(1));
 
     EXPECT_EQ(1, layerCount());
     EXPECT_EQ(0, activeLayerCount());
@@ -90,6 +91,7 @@
 TEST_F(LayerHistoryTest, oneHDRLayer) {
     const auto layer = createLayer();
     EXPECT_CALL(*layer, isVisible()).WillRepeatedly(Return(true));
+    EXPECT_CALL(*layer, getFrameSelectionPriority()).WillRepeatedly(Return(1));
 
     EXPECT_EQ(1, layerCount());
     EXPECT_EQ(0, activeLayerCount());
@@ -109,6 +111,7 @@
 TEST_F(LayerHistoryTest, explicitTimestamp) {
     const auto layer = createLayer();
     EXPECT_CALL(*layer, isVisible()).WillRepeatedly(Return(true));
+    EXPECT_CALL(*layer, getFrameSelectionPriority()).WillRepeatedly(Return(1));
 
     EXPECT_EQ(1, layerCount());
     EXPECT_EQ(0, activeLayerCount());
@@ -130,8 +133,13 @@
     auto layer3 = createLayer();
 
     EXPECT_CALL(*layer1, isVisible()).WillRepeatedly(Return(true));
+    EXPECT_CALL(*layer1, getFrameSelectionPriority()).WillRepeatedly(Return(1));
+
     EXPECT_CALL(*layer2, isVisible()).WillRepeatedly(Return(true));
+    EXPECT_CALL(*layer2, getFrameSelectionPriority()).WillRepeatedly(Return(1));
+
     EXPECT_CALL(*layer3, isVisible()).WillRepeatedly(Return(true));
+    EXPECT_CALL(*layer3, getFrameSelectionPriority()).WillRepeatedly(Return(1));
 
     nsecs_t time = mTime;
 
diff --git a/services/surfaceflinger/tests/unittests/RefreshRateSelectionTest.cpp b/services/surfaceflinger/tests/unittests/RefreshRateSelectionTest.cpp
new file mode 100644
index 0000000..c23a660
--- /dev/null
+++ b/services/surfaceflinger/tests/unittests/RefreshRateSelectionTest.cpp
@@ -0,0 +1,283 @@
+/*
+ * Copyright 2020 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.
+ */
+
+#undef LOG_TAG
+#define LOG_TAG "LibSurfaceFlingerUnittests"
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <gui/LayerMetadata.h>
+
+#include "BufferQueueLayer.h"
+#include "BufferStateLayer.h"
+#include "ColorLayer.h"
+#include "Layer.h"
+#include "TestableSurfaceFlinger.h"
+#include "mock/DisplayHardware/MockComposer.h"
+#include "mock/MockDispSync.h"
+#include "mock/MockEventControlThread.h"
+#include "mock/MockEventThread.h"
+
+namespace android {
+
+using testing::_;
+using testing::DoAll;
+using testing::Mock;
+using testing::Return;
+using testing::SetArgPointee;
+
+using android::Hwc2::IComposer;
+using android::Hwc2::IComposerClient;
+
+using FakeHwcDisplayInjector = TestableSurfaceFlinger::FakeHwcDisplayInjector;
+
+/**
+ * This class covers all the test that are related to refresh rate selection.
+ */
+class RefreshRateSelectionTest : public testing::Test {
+public:
+    RefreshRateSelectionTest();
+    ~RefreshRateSelectionTest() override;
+
+protected:
+    static constexpr int DEFAULT_DISPLAY_WIDTH = 1920;
+    static constexpr int DEFAULT_DISPLAY_HEIGHT = 1024;
+    static constexpr uint32_t WIDTH = 100;
+    static constexpr uint32_t HEIGHT = 100;
+    static constexpr uint32_t LAYER_FLAGS = 0;
+    static constexpr int32_t PRIORITY_UNSET = -1;
+
+    void setupScheduler();
+    void setupComposer(int virtualDisplayCount);
+    sp<BufferQueueLayer> createBufferQueueLayer();
+    sp<BufferStateLayer> createBufferStateLayer();
+    sp<ColorLayer> createColorLayer();
+
+    void setParent(Layer* child, Layer* parent);
+    void commitTransaction(Layer* layer);
+
+    TestableSurfaceFlinger mFlinger;
+    Hwc2::mock::Composer* mComposer = nullptr;
+
+    sp<Client> mClient;
+    sp<Layer> mParent;
+    sp<Layer> mChild;
+    sp<Layer> mGrandChild;
+};
+
+RefreshRateSelectionTest::RefreshRateSelectionTest() {
+    const ::testing::TestInfo* const test_info =
+            ::testing::UnitTest::GetInstance()->current_test_info();
+    ALOGD("**** Setting up for %s.%s\n", test_info->test_case_name(), test_info->name());
+
+    setupScheduler();
+    setupComposer(0);
+}
+
+RefreshRateSelectionTest::~RefreshRateSelectionTest() {
+    const ::testing::TestInfo* const test_info =
+            ::testing::UnitTest::GetInstance()->current_test_info();
+    ALOGD("**** Tearing down after %s.%s\n", test_info->test_case_name(), test_info->name());
+}
+
+sp<BufferQueueLayer> RefreshRateSelectionTest::createBufferQueueLayer() {
+    sp<Client> client;
+    LayerCreationArgs args(mFlinger.flinger(), client, "buffer-queue-layer", WIDTH, HEIGHT,
+                           LAYER_FLAGS, LayerMetadata());
+    return new BufferQueueLayer(args);
+}
+
+sp<BufferStateLayer> RefreshRateSelectionTest::createBufferStateLayer() {
+    sp<Client> client;
+    LayerCreationArgs args(mFlinger.flinger(), client, "buffer-queue-layer", WIDTH, HEIGHT,
+                           LAYER_FLAGS, LayerMetadata());
+    return new BufferStateLayer(args);
+}
+
+sp<ColorLayer> RefreshRateSelectionTest::createColorLayer() {
+    sp<Client> client;
+    LayerCreationArgs args(mFlinger.flinger(), client, "color-layer", WIDTH, HEIGHT, LAYER_FLAGS,
+                           LayerMetadata());
+    return new ColorLayer(args);
+}
+
+void RefreshRateSelectionTest::setParent(Layer* child, Layer* parent) {
+    child->setParent(parent);
+}
+
+void RefreshRateSelectionTest::commitTransaction(Layer* layer) {
+    layer->commitTransaction(layer->getCurrentState());
+}
+
+void RefreshRateSelectionTest::setupScheduler() {
+    auto eventThread = std::make_unique<mock::EventThread>();
+    auto sfEventThread = std::make_unique<mock::EventThread>();
+
+    EXPECT_CALL(*eventThread, registerDisplayEventConnection(_));
+    EXPECT_CALL(*eventThread, createEventConnection(_, _))
+            .WillOnce(Return(new EventThreadConnection(eventThread.get(), ResyncCallback(),
+                                                       ISurfaceComposer::eConfigChangedSuppress)));
+
+    EXPECT_CALL(*sfEventThread, registerDisplayEventConnection(_));
+    EXPECT_CALL(*sfEventThread, createEventConnection(_, _))
+            .WillOnce(Return(new EventThreadConnection(sfEventThread.get(), ResyncCallback(),
+                                                       ISurfaceComposer::eConfigChangedSuppress)));
+
+    auto primaryDispSync = std::make_unique<mock::DispSync>();
+
+    EXPECT_CALL(*primaryDispSync, computeNextRefresh(0)).WillRepeatedly(Return(0));
+    EXPECT_CALL(*primaryDispSync, getPeriod())
+            .WillRepeatedly(Return(FakeHwcDisplayInjector::DEFAULT_REFRESH_RATE));
+    EXPECT_CALL(*primaryDispSync, expectedPresentTime()).WillRepeatedly(Return(0));
+    mFlinger.setupScheduler(std::move(primaryDispSync),
+                            std::make_unique<mock::EventControlThread>(), std::move(eventThread),
+                            std::move(sfEventThread));
+}
+
+void RefreshRateSelectionTest::setupComposer(int virtualDisplayCount) {
+    mComposer = new Hwc2::mock::Composer();
+    EXPECT_CALL(*mComposer, getCapabilities())
+            .WillOnce(Return(std::vector<IComposer::Capability>()));
+    EXPECT_CALL(*mComposer, getMaxVirtualDisplayCount()).WillOnce(Return(virtualDisplayCount));
+    mFlinger.setupComposer(std::unique_ptr<Hwc2::Composer>(mComposer));
+
+    Mock::VerifyAndClear(mComposer);
+}
+
+namespace {
+/* ------------------------------------------------------------------------
+ * Test cases
+ */
+TEST_F(RefreshRateSelectionTest, testPriorityOnBufferQueueLayers) {
+    mParent = createBufferQueueLayer();
+    mChild = createBufferQueueLayer();
+    setParent(mChild.get(), mParent.get());
+    mGrandChild = createBufferQueueLayer();
+    setParent(mGrandChild.get(), mChild.get());
+
+    ASSERT_EQ(PRIORITY_UNSET, mParent->getFrameRateSelectionPriority());
+    ASSERT_EQ(PRIORITY_UNSET, mChild->getFrameRateSelectionPriority());
+    ASSERT_EQ(PRIORITY_UNSET, mGrandChild->getFrameRateSelectionPriority());
+
+    // Child has its own priority.
+    mGrandChild->setFrameRateSelectionPriority(1);
+    commitTransaction(mGrandChild.get());
+    ASSERT_EQ(PRIORITY_UNSET, mParent->getFrameRateSelectionPriority());
+    ASSERT_EQ(PRIORITY_UNSET, mChild->getFrameRateSelectionPriority());
+    ASSERT_EQ(1, mGrandChild->getFrameRateSelectionPriority());
+
+    // Child inherits from his parent.
+    mChild->setFrameRateSelectionPriority(1);
+    commitTransaction(mChild.get());
+    mGrandChild->setFrameRateSelectionPriority(PRIORITY_UNSET);
+    commitTransaction(mGrandChild.get());
+
+    ASSERT_EQ(PRIORITY_UNSET, mParent->getFrameRateSelectionPriority());
+    ASSERT_EQ(1, mChild->getFrameRateSelectionPriority());
+    ASSERT_EQ(1, mGrandChild->getFrameRateSelectionPriority());
+
+    // Grandchild inherits from his grand parent.
+    mParent->setFrameRateSelectionPriority(1);
+    commitTransaction(mParent.get());
+    mChild->setFrameRateSelectionPriority(PRIORITY_UNSET);
+    commitTransaction(mChild.get());
+    mGrandChild->setFrameRateSelectionPriority(PRIORITY_UNSET);
+    commitTransaction(mGrandChild.get());
+    ASSERT_EQ(1, mParent->getFrameRateSelectionPriority());
+    ASSERT_EQ(1, mChild->getFrameRateSelectionPriority());
+    ASSERT_EQ(1, mGrandChild->getFrameRateSelectionPriority());
+}
+
+TEST_F(RefreshRateSelectionTest, testPriorityOnBufferStateLayers) {
+    mParent = createBufferStateLayer();
+    mChild = createBufferStateLayer();
+    setParent(mChild.get(), mParent.get());
+    mGrandChild = createBufferStateLayer();
+    setParent(mGrandChild.get(), mChild.get());
+
+    ASSERT_EQ(PRIORITY_UNSET, mParent->getFrameRateSelectionPriority());
+    ASSERT_EQ(PRIORITY_UNSET, mChild->getFrameRateSelectionPriority());
+    ASSERT_EQ(PRIORITY_UNSET, mGrandChild->getFrameRateSelectionPriority());
+
+    // Child has its own priority.
+    mGrandChild->setFrameRateSelectionPriority(1);
+    commitTransaction(mGrandChild.get());
+    ASSERT_EQ(PRIORITY_UNSET, mParent->getFrameRateSelectionPriority());
+    ASSERT_EQ(PRIORITY_UNSET, mChild->getFrameRateSelectionPriority());
+    ASSERT_EQ(1, mGrandChild->getFrameRateSelectionPriority());
+
+    // Child inherits from his parent.
+    mChild->setFrameRateSelectionPriority(1);
+    commitTransaction(mChild.get());
+    mGrandChild->setFrameRateSelectionPriority(PRIORITY_UNSET);
+    commitTransaction(mGrandChild.get());
+    ASSERT_EQ(PRIORITY_UNSET, mParent->getFrameRateSelectionPriority());
+    ASSERT_EQ(1, mChild->getFrameRateSelectionPriority());
+    ASSERT_EQ(1, mGrandChild->getFrameRateSelectionPriority());
+
+    // Grandchild inherits from his grand parent.
+    mParent->setFrameRateSelectionPriority(1);
+    commitTransaction(mParent.get());
+    mChild->setFrameRateSelectionPriority(PRIORITY_UNSET);
+    commitTransaction(mChild.get());
+    mGrandChild->setFrameRateSelectionPriority(PRIORITY_UNSET);
+    commitTransaction(mGrandChild.get());
+    ASSERT_EQ(1, mParent->getFrameRateSelectionPriority());
+    ASSERT_EQ(1, mChild->getFrameRateSelectionPriority());
+    ASSERT_EQ(1, mGrandChild->getFrameRateSelectionPriority());
+}
+
+TEST_F(RefreshRateSelectionTest, testPriorityOnColorLayers) {
+    mParent = createColorLayer();
+    mChild = createColorLayer();
+    setParent(mChild.get(), mParent.get());
+    mGrandChild = createColorLayer();
+    setParent(mGrandChild.get(), mChild.get());
+
+    ASSERT_EQ(PRIORITY_UNSET, mParent->getFrameRateSelectionPriority());
+    ASSERT_EQ(PRIORITY_UNSET, mChild->getFrameRateSelectionPriority());
+    ASSERT_EQ(PRIORITY_UNSET, mGrandChild->getFrameRateSelectionPriority());
+
+    // Child has its own priority.
+    mGrandChild->setFrameRateSelectionPriority(1);
+    commitTransaction(mGrandChild.get());
+    ASSERT_EQ(PRIORITY_UNSET, mParent->getFrameRateSelectionPriority());
+    ASSERT_EQ(PRIORITY_UNSET, mChild->getFrameRateSelectionPriority());
+    ASSERT_EQ(1, mGrandChild->getFrameRateSelectionPriority());
+
+    // Child inherits from his parent.
+    mChild->setFrameRateSelectionPriority(1);
+    commitTransaction(mChild.get());
+    mGrandChild->setFrameRateSelectionPriority(PRIORITY_UNSET);
+    commitTransaction(mGrandChild.get());
+    ASSERT_EQ(PRIORITY_UNSET, mParent->getFrameRateSelectionPriority());
+    ASSERT_EQ(1, mChild->getFrameRateSelectionPriority());
+    ASSERT_EQ(1, mGrandChild->getFrameRateSelectionPriority());
+
+    // Grandchild inherits from his grand parent.
+    mParent->setFrameRateSelectionPriority(1);
+    commitTransaction(mParent.get());
+    mChild->setFrameRateSelectionPriority(PRIORITY_UNSET);
+    commitTransaction(mChild.get());
+    mGrandChild->setFrameRateSelectionPriority(PRIORITY_UNSET);
+    commitTransaction(mGrandChild.get());
+    ASSERT_EQ(1, mParent->getFrameRateSelectionPriority());
+    ASSERT_EQ(1, mChild->getFrameRateSelectionPriority());
+    ASSERT_EQ(1, mGrandChild->getFrameRateSelectionPriority());
+}
+
+} // namespace
+} // namespace android
\ No newline at end of file
diff --git a/services/surfaceflinger/tests/unittests/mock/MockLayer.h b/services/surfaceflinger/tests/unittests/mock/MockLayer.h
index f375e23..1fd0e61 100644
--- a/services/surfaceflinger/tests/unittests/mock/MockLayer.h
+++ b/services/surfaceflinger/tests/unittests/mock/MockLayer.h
@@ -28,6 +28,7 @@
           : Layer(LayerCreationArgs(flinger, nullptr, "TestLayer", 800, 600, 0, {})) {}
 
     MOCK_CONST_METHOD0(getType, const char*());
+    MOCK_METHOD0(getFrameSelectionPriority, int32_t());
     MOCK_CONST_METHOD0(isVisible, bool());
     MOCK_METHOD0(createClone, sp<Layer>());
 };