diff --git a/services/surfaceflinger/tests/unittests/Android.bp b/services/surfaceflinger/tests/unittests/Android.bp
index 13b26fc..7ae09fa 100644
--- a/services/surfaceflinger/tests/unittests/Android.bp
+++ b/services/surfaceflinger/tests/unittests/Android.bp
@@ -73,6 +73,7 @@
         "FrameTracerTest.cpp",
         "TimerTest.cpp",
         "TransactionApplicationTest.cpp",
+        "TransactionSurfaceFrameTest.cpp",
         "StrongTypingTest.cpp",
         "VSyncDispatchTimerQueueTest.cpp",
         "VSyncDispatchRealtimeTest.cpp",
diff --git a/services/surfaceflinger/tests/unittests/TransactionSurfaceFrameTest.cpp b/services/surfaceflinger/tests/unittests/TransactionSurfaceFrameTest.cpp
new file mode 100644
index 0000000..aa6798d
--- /dev/null
+++ b/services/surfaceflinger/tests/unittests/TransactionSurfaceFrameTest.cpp
@@ -0,0 +1,367 @@
+/*
+ * Copyright 2021 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/SurfaceComposerClient.h>
+#include <log/log.h>
+#include <utils/String8.h>
+
+#include "TestableSurfaceFlinger.h"
+#include "mock/DisplayHardware/MockComposer.h"
+#include "mock/MockEventThread.h"
+#include "mock/MockVsyncController.h"
+
+namespace android {
+
+using testing::_;
+using testing::Mock;
+using testing::Return;
+using FakeHwcDisplayInjector = TestableSurfaceFlinger::FakeHwcDisplayInjector;
+using PresentState = frametimeline::SurfaceFrame::PresentState;
+
+class TransactionSurfaceFrameTest : public testing::Test {
+public:
+    TransactionSurfaceFrameTest() {
+        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);
+    }
+
+    ~TransactionSurfaceFrameTest() {
+        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<BufferStateLayer> createBufferStateLayer() {
+        sp<Client> client;
+        LayerCreationArgs args(mFlinger.flinger(), client, "buffer-state-layer", 100, 100, 0,
+                               LayerMetadata());
+        return new BufferStateLayer(args);
+    }
+
+    void commitTransaction(Layer* layer) {
+        layer->pushPendingState();
+        // After pushing the state, the currentState should not store any BufferlessSurfaceFrames
+        EXPECT_EQ(0u, layer->mCurrentState.bufferlessSurfaceFramesTX.size());
+        auto c = layer->getCurrentState();
+        if (layer->applyPendingStates(&c)) {
+            layer->commitTransaction(c);
+        }
+    }
+
+    void 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(), /*callingUid=*/0,
+                                                           ResyncCallback())));
+
+        EXPECT_CALL(*sfEventThread, registerDisplayEventConnection(_));
+        EXPECT_CALL(*sfEventThread, createEventConnection(_, _))
+                .WillOnce(Return(new EventThreadConnection(sfEventThread.get(), /*callingUid=*/0,
+                                                           ResyncCallback())));
+
+        auto vsyncController = std::make_unique<mock::VsyncController>();
+        auto vsyncTracker = std::make_unique<mock::VSyncTracker>();
+
+        EXPECT_CALL(*vsyncTracker, nextAnticipatedVSyncTimeFrom(_)).WillRepeatedly(Return(0));
+        EXPECT_CALL(*vsyncTracker, currentPeriod())
+                .WillRepeatedly(Return(FakeHwcDisplayInjector::DEFAULT_VSYNC_PERIOD));
+        EXPECT_CALL(*vsyncTracker, nextAnticipatedVSyncTimeFrom(_)).WillRepeatedly(Return(0));
+        mFlinger.setupScheduler(std::move(vsyncController), std::move(vsyncTracker),
+                                std::move(eventThread), std::move(sfEventThread));
+    }
+
+    void setupComposer(uint32_t virtualDisplayCount) {
+        mComposer = new Hwc2::mock::Composer();
+        EXPECT_CALL(*mComposer, getMaxVirtualDisplayCount()).WillOnce(Return(virtualDisplayCount));
+        mFlinger.setupComposer(std::unique_ptr<Hwc2::Composer>(mComposer));
+
+        Mock::VerifyAndClear(mComposer);
+    }
+
+    TestableSurfaceFlinger mFlinger;
+    Hwc2::mock::Composer* mComposer = nullptr;
+    FenceToFenceTimeMap fenceFactory;
+    client_cache_t mClientCache;
+
+    void PresentedSurfaceFrameForBufferlessTransaction() {
+        sp<BufferStateLayer> layer = createBufferStateLayer();
+        layer->setFrameTimelineVsyncForBufferlessTransaction({/*vsyncId*/ 1, /*inputEventId*/ 0},
+                                                             10);
+        EXPECT_EQ(1u, layer->mCurrentState.bufferlessSurfaceFramesTX.size());
+        ASSERT_TRUE(layer->mCurrentState.bufferSurfaceFrameTX == nullptr);
+        const auto surfaceFrame = layer->mCurrentState.bufferlessSurfaceFramesTX.at(/*token*/ 1);
+        commitTransaction(layer.get());
+        EXPECT_EQ(1, surfaceFrame->getToken());
+        EXPECT_EQ(PresentState::Presented, surfaceFrame->getPresentState());
+    }
+
+    void PresentedSurfaceFrameForBufferTransaction() {
+        sp<BufferStateLayer> layer = createBufferStateLayer();
+        sp<Fence> fence(new Fence());
+        auto acquireFence = fenceFactory.createFenceTimeForTest(fence);
+        sp<GraphicBuffer> buffer{new GraphicBuffer(1, 1, HAL_PIXEL_FORMAT_RGBA_8888, 1, 0)};
+        layer->setBuffer(buffer, fence, 10, 20, false, mClientCache, 1, std::nullopt,
+                         {/*vsyncId*/ 1, /*inputEventId*/ 0});
+        acquireFence->signalForTest(12);
+
+        commitTransaction(layer.get());
+        EXPECT_EQ(0u, layer->mCurrentState.bufferlessSurfaceFramesTX.size());
+        ASSERT_NE(nullptr, layer->mCurrentState.bufferSurfaceFrameTX);
+        const auto& surfaceFrame = layer->mCurrentState.bufferSurfaceFrameTX;
+        // Buffers are presented only at latch time.
+        EXPECT_EQ(PresentState::Unknown, surfaceFrame->getPresentState());
+
+        bool computeVisisbleRegions;
+        layer->updateTexImage(computeVisisbleRegions, 15, 0);
+
+        EXPECT_EQ(1, surfaceFrame->getToken());
+        EXPECT_EQ(PresentState::Presented, surfaceFrame->getPresentState());
+    }
+
+    void DroppedSurfaceFrameForBufferTransaction() {
+        sp<BufferStateLayer> layer = createBufferStateLayer();
+
+        sp<Fence> fence1(new Fence());
+        auto acquireFence1 = fenceFactory.createFenceTimeForTest(fence1);
+        sp<GraphicBuffer> buffer1{new GraphicBuffer(1, 1, HAL_PIXEL_FORMAT_RGBA_8888, 1, 0)};
+        layer->setBuffer(buffer1, fence1, 10, 20, false, mClientCache, 1, std::nullopt,
+                         {/*vsyncId*/ 1, /*inputEventId*/ 0});
+        EXPECT_EQ(0u, layer->mCurrentState.bufferlessSurfaceFramesTX.size());
+        ASSERT_NE(nullptr, layer->mCurrentState.bufferSurfaceFrameTX);
+        const auto droppedSurfaceFrame = layer->mCurrentState.bufferSurfaceFrameTX;
+
+        sp<Fence> fence2(new Fence());
+        auto acquireFence2 = fenceFactory.createFenceTimeForTest(fence2);
+        sp<GraphicBuffer> buffer2{new GraphicBuffer(1, 1, HAL_PIXEL_FORMAT_RGBA_8888, 1, 0)};
+        layer->setBuffer(buffer2, fence2, 10, 20, false, mClientCache, 1, std::nullopt,
+                         {/*vsyncId*/ 1, /*inputEventId*/ 0});
+        acquireFence2->signalForTest(12);
+
+        EXPECT_EQ(0u, layer->mCurrentState.bufferlessSurfaceFramesTX.size());
+        ASSERT_NE(nullptr, layer->mCurrentState.bufferSurfaceFrameTX);
+        const auto& presentedSurfaceFrame = layer->mCurrentState.bufferSurfaceFrameTX;
+
+        commitTransaction(layer.get());
+        bool computeVisisbleRegions;
+        layer->updateTexImage(computeVisisbleRegions, 15, 0);
+
+        EXPECT_EQ(1, droppedSurfaceFrame->getToken());
+        EXPECT_EQ(PresentState::Dropped, droppedSurfaceFrame->getPresentState());
+
+        EXPECT_EQ(1, presentedSurfaceFrame->getToken());
+        EXPECT_EQ(PresentState::Presented, presentedSurfaceFrame->getPresentState());
+    }
+
+    void BufferlessSurfaceFramePromotedToBufferSurfaceFrame() {
+        sp<BufferStateLayer> layer = createBufferStateLayer();
+
+        layer->setFrameTimelineVsyncForBufferlessTransaction({/*vsyncId*/ 1, /*inputEventId*/ 0},
+                                                             10);
+
+        EXPECT_EQ(1u, layer->mCurrentState.bufferlessSurfaceFramesTX.size());
+        ASSERT_EQ(nullptr, layer->mCurrentState.bufferSurfaceFrameTX);
+
+        sp<Fence> fence(new Fence());
+        auto acquireFence = fenceFactory.createFenceTimeForTest(fence);
+        sp<GraphicBuffer> buffer{new GraphicBuffer(1, 1, HAL_PIXEL_FORMAT_RGBA_8888, 1, 0)};
+
+        layer->setBuffer(buffer, fence, 10, 20, false, mClientCache, 1, std::nullopt,
+                         {/*vsyncId*/ 1, /*inputEventId*/ 0});
+        acquireFence->signalForTest(12);
+
+        EXPECT_EQ(0u, layer->mCurrentState.bufferlessSurfaceFramesTX.size());
+        ASSERT_NE(nullptr, layer->mCurrentState.bufferSurfaceFrameTX);
+        const auto& surfaceFrame = layer->mCurrentState.bufferSurfaceFrameTX;
+
+        commitTransaction(layer.get());
+        EXPECT_EQ(1, surfaceFrame->getToken());
+        // Buffers are presented only at latch time.
+        EXPECT_EQ(PresentState::Unknown, surfaceFrame->getPresentState());
+
+        bool computeVisisbleRegions;
+        layer->updateTexImage(computeVisisbleRegions, 15, 0);
+
+        EXPECT_EQ(PresentState::Presented, surfaceFrame->getPresentState());
+    }
+
+    void BufferlessSurfaceFrameNotCreatedIfBufferSufaceFrameExists() {
+        sp<BufferStateLayer> layer = createBufferStateLayer();
+        sp<Fence> fence(new Fence());
+        auto acquireFence = fenceFactory.createFenceTimeForTest(fence);
+        sp<GraphicBuffer> buffer{new GraphicBuffer(1, 1, HAL_PIXEL_FORMAT_RGBA_8888, 1, 0)};
+
+        layer->setBuffer(buffer, fence, 10, 20, false, mClientCache, 1, std::nullopt,
+                         {/*vsyncId*/ 1, /*inputEventId*/ 0});
+        EXPECT_EQ(0u, layer->mCurrentState.bufferlessSurfaceFramesTX.size());
+        ASSERT_NE(nullptr, layer->mCurrentState.bufferSurfaceFrameTX);
+
+        layer->setFrameTimelineVsyncForBufferlessTransaction({/*vsyncId*/ 1, /*inputEventId*/ 0},
+                                                             10);
+        EXPECT_EQ(0u, layer->mCurrentState.bufferlessSurfaceFramesTX.size());
+        ASSERT_NE(nullptr, layer->mCurrentState.bufferSurfaceFrameTX);
+    }
+
+    void MultipleSurfaceFramesPresentedTogether() {
+        sp<BufferStateLayer> layer = createBufferStateLayer();
+        layer->setFrameTimelineVsyncForBufferlessTransaction({/*vsyncId*/ 1, /*inputEventId*/ 0},
+                                                             10);
+        EXPECT_EQ(1u, layer->mCurrentState.bufferlessSurfaceFramesTX.size());
+        ASSERT_EQ(nullptr, layer->mCurrentState.bufferSurfaceFrameTX);
+        const auto bufferlessSurfaceFrame1 =
+                layer->mCurrentState.bufferlessSurfaceFramesTX.at(/*token*/ 1);
+
+        layer->setFrameTimelineVsyncForBufferlessTransaction({/*vsyncId*/ 4, /*inputEventId*/ 0},
+                                                             10);
+        EXPECT_EQ(2u, layer->mCurrentState.bufferlessSurfaceFramesTX.size());
+        ASSERT_EQ(nullptr, layer->mCurrentState.bufferSurfaceFrameTX);
+        const auto bufferlessSurfaceFrame2 = layer->mCurrentState.bufferlessSurfaceFramesTX[4];
+
+        sp<Fence> fence(new Fence());
+        auto acquireFence = fenceFactory.createFenceTimeForTest(fence);
+        sp<GraphicBuffer> buffer{new GraphicBuffer(1, 1, HAL_PIXEL_FORMAT_RGBA_8888, 1, 0)};
+
+        layer->setBuffer(buffer, fence, 10, 20, false, mClientCache, 1, std::nullopt,
+                         {/*vsyncId*/ 3, /*inputEventId*/ 0});
+        EXPECT_EQ(2u, layer->mCurrentState.bufferlessSurfaceFramesTX.size());
+        ASSERT_NE(nullptr, layer->mCurrentState.bufferSurfaceFrameTX);
+        const auto& bufferSurfaceFrameTX = layer->mCurrentState.bufferSurfaceFrameTX;
+
+        acquireFence->signalForTest(12);
+
+        commitTransaction(layer.get());
+
+        EXPECT_EQ(1, bufferlessSurfaceFrame1->getToken());
+        EXPECT_EQ(PresentState::Presented, bufferlessSurfaceFrame1->getPresentState());
+
+        EXPECT_EQ(4, bufferlessSurfaceFrame2->getToken());
+        EXPECT_EQ(PresentState::Presented, bufferlessSurfaceFrame2->getPresentState());
+
+        EXPECT_EQ(3, bufferSurfaceFrameTX->getToken());
+        // Buffers are presented only at latch time.
+        EXPECT_EQ(PresentState::Unknown, bufferSurfaceFrameTX->getPresentState());
+
+        bool computeVisisbleRegions;
+        layer->updateTexImage(computeVisisbleRegions, 15, 0);
+
+        EXPECT_EQ(PresentState::Presented, bufferSurfaceFrameTX->getPresentState());
+    }
+
+    void MergePendingStates_BufferlessSurfaceFramesWithoutOverlappingToken() {
+        sp<BufferStateLayer> layer = createBufferStateLayer();
+        layer->setFrameTimelineVsyncForBufferlessTransaction({/*vsyncId*/ 1, /*inputEventId*/ 0},
+                                                             10);
+        EXPECT_EQ(1u, layer->mCurrentState.bufferlessSurfaceFramesTX.size());
+        ASSERT_EQ(nullptr, layer->mCurrentState.bufferSurfaceFrameTX);
+        const auto bufferlessSurfaceFrame1 =
+                layer->mCurrentState.bufferlessSurfaceFramesTX.at(/*token*/ 1);
+
+        layer->pushPendingState();
+        EXPECT_EQ(0u, layer->mCurrentState.bufferlessSurfaceFramesTX.size());
+
+        layer->setFrameTimelineVsyncForBufferlessTransaction({/*vsyncId*/ 2, /*inputEventId*/ 0},
+                                                             12);
+        EXPECT_EQ(1u, layer->mCurrentState.bufferlessSurfaceFramesTX.size());
+        ASSERT_EQ(nullptr, layer->mCurrentState.bufferSurfaceFrameTX);
+        const auto bufferlessSurfaceFrame2 =
+                layer->mCurrentState.bufferlessSurfaceFramesTX.at(/*token*/ 2);
+
+        commitTransaction(layer.get());
+
+        EXPECT_EQ(1, bufferlessSurfaceFrame1->getToken());
+        EXPECT_EQ(PresentState::Presented, bufferlessSurfaceFrame1->getPresentState());
+        EXPECT_EQ(10, bufferlessSurfaceFrame1->getActuals().endTime);
+
+        EXPECT_EQ(2, bufferlessSurfaceFrame2->getToken());
+        EXPECT_EQ(PresentState::Presented, bufferlessSurfaceFrame2->getPresentState());
+        EXPECT_EQ(12, bufferlessSurfaceFrame2->getActuals().endTime);
+    }
+
+    void MergePendingStates_BufferlessSurfaceFramesWithOverlappingToken() {
+        sp<BufferStateLayer> layer = createBufferStateLayer();
+        layer->setFrameTimelineVsyncForBufferlessTransaction({/*vsyncId*/ 1, /*inputEventId*/ 0},
+                                                             10);
+        EXPECT_EQ(1u, layer->mCurrentState.bufferlessSurfaceFramesTX.size());
+        ASSERT_EQ(nullptr, layer->mCurrentState.bufferSurfaceFrameTX);
+        const auto bufferlessSurfaceFrame1 =
+                layer->mCurrentState.bufferlessSurfaceFramesTX.at(/*token*/ 1);
+
+        layer->pushPendingState();
+        EXPECT_EQ(0u, layer->mCurrentState.bufferlessSurfaceFramesTX.size());
+
+        layer->setFrameTimelineVsyncForBufferlessTransaction({/*vsyncId*/ 1, /*inputEventId*/ 0},
+                                                             12);
+        EXPECT_EQ(1u, layer->mCurrentState.bufferlessSurfaceFramesTX.size());
+        ASSERT_EQ(nullptr, layer->mCurrentState.bufferSurfaceFrameTX);
+        const auto bufferlessSurfaceFrame2 =
+                layer->mCurrentState.bufferlessSurfaceFramesTX.at(/*token*/ 1);
+
+        commitTransaction(layer.get());
+
+        EXPECT_EQ(1, bufferlessSurfaceFrame1->getToken());
+        EXPECT_EQ(PresentState::Unknown, bufferlessSurfaceFrame1->getPresentState());
+
+        EXPECT_EQ(1, bufferlessSurfaceFrame2->getToken());
+        EXPECT_EQ(PresentState::Presented, bufferlessSurfaceFrame2->getPresentState());
+        EXPECT_EQ(12, bufferlessSurfaceFrame2->getActuals().endTime);
+    }
+};
+
+TEST_F(TransactionSurfaceFrameTest, PresentedBufferlessSurfaceFrame) {
+    PresentedSurfaceFrameForBufferlessTransaction();
+}
+
+TEST_F(TransactionSurfaceFrameTest, PresentedBufferSurfaceFrame) {
+    PresentedSurfaceFrameForBufferTransaction();
+}
+
+TEST_F(TransactionSurfaceFrameTest, DroppedBufferSurfaceFrame) {
+    DroppedSurfaceFrameForBufferTransaction();
+}
+
+TEST_F(TransactionSurfaceFrameTest, BufferlessSurfaceFramePromotedToBufferSurfaceFrame) {
+    BufferlessSurfaceFramePromotedToBufferSurfaceFrame();
+}
+
+TEST_F(TransactionSurfaceFrameTest, BufferlessSurfaceFrameNotCreatedIfBufferSufaceFrameExists) {
+    BufferlessSurfaceFrameNotCreatedIfBufferSufaceFrameExists();
+}
+
+TEST_F(TransactionSurfaceFrameTest, MultipleSurfaceFramesPresentedTogether) {
+    MultipleSurfaceFramesPresentedTogether();
+}
+
+TEST_F(TransactionSurfaceFrameTest,
+       MergePendingStates_BufferlessSurfaceFramesWithoutOverlappingToken) {
+    MergePendingStates_BufferlessSurfaceFramesWithoutOverlappingToken();
+}
+
+TEST_F(TransactionSurfaceFrameTest,
+       MergePendingStates_BufferlessSurfaceFramesWithOverlappingToken) {
+    MergePendingStates_BufferlessSurfaceFramesWithOverlappingToken();
+}
+
+} // namespace android
\ No newline at end of file