diff --git a/services/surfaceflinger/tests/unittests/Android.bp b/services/surfaceflinger/tests/unittests/Android.bp
index 1a13f77..2f35ae5 100644
--- a/services/surfaceflinger/tests/unittests/Android.bp
+++ b/services/surfaceflinger/tests/unittests/Android.bp
@@ -30,6 +30,7 @@
         "DisplayTransactionTest.cpp",
         "EventControlThreadTest.cpp",
         "EventThreadTest.cpp",
+        "IdleTimerTest.cpp",
         "LayerHistoryTest.cpp",
         "SchedulerTest.cpp",
         "SchedulerUtilsTest.cpp",
diff --git a/services/surfaceflinger/tests/unittests/IdleTimerTest.cpp b/services/surfaceflinger/tests/unittests/IdleTimerTest.cpp
new file mode 100644
index 0000000..9fe9a18
--- /dev/null
+++ b/services/surfaceflinger/tests/unittests/IdleTimerTest.cpp
@@ -0,0 +1,126 @@
+/*
+ * Copyright 2018 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 "SchedulerUnittests"
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <utils/Log.h>
+
+#include "AsyncCallRecorder.h"
+#include "Scheduler/IdleTimer.h"
+
+using namespace std::chrono_literals;
+
+namespace android {
+namespace scheduler {
+
+class IdleTimerTest : public testing::Test {
+protected:
+    IdleTimerTest() = default;
+    ~IdleTimerTest() override = default;
+
+    AsyncCallRecorder<void (*)()> mExpiredTimerCallback;
+
+    std::unique_ptr<IdleTimer> mIdleTimer;
+};
+
+namespace {
+TEST_F(IdleTimerTest, createAndDestroyTest) {
+    mIdleTimer = std::make_unique<scheduler::IdleTimer>(30ms, [] {});
+}
+
+TEST_F(IdleTimerTest, startStopTest) {
+    mIdleTimer = std::make_unique<scheduler::IdleTimer>(30ms, mExpiredTimerCallback.getInvocable());
+    mIdleTimer->start();
+    std::this_thread::sleep_for(std::chrono::milliseconds(10));
+    // The timer expires after 30 ms, so the call to the callback should not happen.
+    EXPECT_FALSE(mExpiredTimerCallback.waitForCall().has_value());
+    mIdleTimer->stop();
+}
+
+TEST_F(IdleTimerTest, resetTest) {
+    mIdleTimer = std::make_unique<scheduler::IdleTimer>(20ms, mExpiredTimerCallback.getInvocable());
+    mIdleTimer->start();
+    std::this_thread::sleep_for(std::chrono::milliseconds(10));
+    // The timer expires after 30 ms, so the call to the callback should not happen.
+    EXPECT_FALSE(mExpiredTimerCallback.waitForCall(1us).has_value());
+    mIdleTimer->reset();
+    // The timer was reset, so the call to the callback should not happen.
+    std::this_thread::sleep_for(std::chrono::milliseconds(15));
+    EXPECT_FALSE(mExpiredTimerCallback.waitForCall(1us).has_value());
+    mIdleTimer->stop();
+}
+
+TEST_F(IdleTimerTest, startNotCalledTest) {
+    mIdleTimer = std::make_unique<scheduler::IdleTimer>(3ms, mExpiredTimerCallback.getInvocable());
+    std::this_thread::sleep_for(6ms);
+    // The start hasn't happened, so the callback does not happen.
+    EXPECT_FALSE(mExpiredTimerCallback.waitForCall(1us).has_value());
+    mIdleTimer->stop();
+}
+
+TEST_F(IdleTimerTest, idleTimerIdlesTest) {
+    mIdleTimer = std::make_unique<scheduler::IdleTimer>(3ms, mExpiredTimerCallback.getInvocable());
+    mIdleTimer->start();
+    std::this_thread::sleep_for(6ms);
+    // The timer expires after 3 ms, so the call to the callback happens.
+    EXPECT_TRUE(mExpiredTimerCallback.waitForCall(1us).has_value());
+    std::this_thread::sleep_for(6ms);
+    // Timer can be idle.
+    EXPECT_FALSE(mExpiredTimerCallback.waitForCall(1us).has_value());
+    // Timer can be reset.
+    mIdleTimer->reset();
+    std::this_thread::sleep_for(6ms);
+    // Timer fires again.
+    EXPECT_TRUE(mExpiredTimerCallback.waitForCall(1us).has_value());
+    mIdleTimer->stop();
+}
+
+TEST_F(IdleTimerTest, timeoutCallbackExecutionTest) {
+    mIdleTimer = std::make_unique<scheduler::IdleTimer>(3ms, mExpiredTimerCallback.getInvocable());
+
+    mIdleTimer->start();
+    std::this_thread::sleep_for(6ms);
+    // The timer expires after 3 ms, so the call to the callback should happen.
+    EXPECT_TRUE(mExpiredTimerCallback.waitForCall(1us).has_value());
+    mIdleTimer->stop();
+}
+
+TEST_F(IdleTimerTest, noCallbacksAfterStopAndResetTest) {
+    mIdleTimer = std::make_unique<scheduler::IdleTimer>(3ms, mExpiredTimerCallback.getInvocable());
+    mIdleTimer->start();
+    std::this_thread::sleep_for(6ms);
+    EXPECT_TRUE(mExpiredTimerCallback.waitForCall().has_value());
+    mIdleTimer->stop();
+    mIdleTimer->reset();
+    std::this_thread::sleep_for(6ms);
+    EXPECT_FALSE(mExpiredTimerCallback.waitForCall().has_value());
+}
+
+TEST_F(IdleTimerTest, noCallbacksAfterStopTest) {
+    mIdleTimer = std::make_unique<scheduler::IdleTimer>(3ms, mExpiredTimerCallback.getInvocable());
+    mIdleTimer->start();
+    std::this_thread::sleep_for(1ms);
+    mIdleTimer->stop();
+    std::this_thread::sleep_for(3ms);
+    EXPECT_FALSE(mExpiredTimerCallback.waitForCall(1us).has_value());
+}
+
+} // namespace
+} // namespace scheduler
+} // namespace android
\ No newline at end of file