diff --git a/services/gpuservice/GpuService.cpp b/services/gpuservice/GpuService.cpp
index 116cd16..91a76f1 100644
--- a/services/gpuservice/GpuService.cpp
+++ b/services/gpuservice/GpuService.cpp
@@ -52,8 +52,9 @@
                              int64_t driverBuildTime, const std::string& appPackageName,
                              const int32_t vulkanVersion, GpuStatsInfo::Driver driver,
                              bool isDriverLoaded, int64_t driverLoadingTime) {
-    mGpuStats->insert(driverPackageName, driverVersionName, driverVersionCode, driverBuildTime,
-                      appPackageName, vulkanVersion, driver, isDriverLoaded, driverLoadingTime);
+    mGpuStats->insertDriverStats(driverPackageName, driverVersionName, driverVersionCode,
+                                 driverBuildTime, appPackageName, vulkanVersion, driver,
+                                 isDriverLoaded, driverLoadingTime);
 }
 
 status_t GpuService::getGpuStatsGlobalInfo(std::vector<GpuStatsGlobalInfo>* outStats) const {
diff --git a/services/gpuservice/TEST_MAPPING b/services/gpuservice/TEST_MAPPING
new file mode 100644
index 0000000..b345355
--- /dev/null
+++ b/services/gpuservice/TEST_MAPPING
@@ -0,0 +1,7 @@
+{
+  "presubmit": [
+    {
+      "name": "gpuservice_unittest"
+    }
+  ]
+}
diff --git a/services/gpuservice/gpustats/GpuStats.cpp b/services/gpuservice/gpustats/GpuStats.cpp
index 63723b6..71e6b97 100644
--- a/services/gpuservice/gpustats/GpuStats.cpp
+++ b/services/gpuservice/gpustats/GpuStats.cpp
@@ -74,10 +74,11 @@
     }
 }
 
-void GpuStats::insert(const std::string& driverPackageName, const std::string& driverVersionName,
-                      uint64_t driverVersionCode, int64_t driverBuildTime,
-                      const std::string& appPackageName, const int32_t vulkanVersion,
-                      GpuStatsInfo::Driver driver, bool isDriverLoaded, int64_t driverLoadingTime) {
+void GpuStats::insertDriverStats(const std::string& driverPackageName,
+                                 const std::string& driverVersionName, uint64_t driverVersionCode,
+                                 int64_t driverBuildTime, const std::string& appPackageName,
+                                 const int32_t vulkanVersion, GpuStatsInfo::Driver driver,
+                                 bool isDriverLoaded, int64_t driverLoadingTime) {
     ATRACE_CALL();
 
     std::lock_guard<std::mutex> lock(mLock);
@@ -191,6 +192,11 @@
         dumpAll = false;
     }
 
+    if (dumpAll) {
+        dumpGlobalLocked(result);
+        dumpAppLocked(result);
+    }
+
     if (argsSet.count("--clear")) {
         bool clearAll = true;
 
@@ -208,13 +214,6 @@
             mGlobalStats.clear();
             mAppStats.clear();
         }
-
-        dumpAll = false;
-    }
-
-    if (dumpAll) {
-        dumpGlobalLocked(result);
-        dumpAppLocked(result);
     }
 }
 
diff --git a/services/gpuservice/gpustats/include/gpustats/GpuStats.h b/services/gpuservice/gpustats/include/gpustats/GpuStats.h
index bdc9bf5..bcb9e0d 100644
--- a/services/gpuservice/gpustats/include/gpustats/GpuStats.h
+++ b/services/gpuservice/gpustats/include/gpustats/GpuStats.h
@@ -32,11 +32,12 @@
     GpuStats() = default;
     ~GpuStats() = default;
 
-    // Insert new gpu stats into global stats and app stats.
-    void insert(const std::string& driverPackageName, const std::string& driverVersionName,
-                uint64_t driverVersionCode, int64_t driverBuildTime,
-                const std::string& appPackageName, const int32_t vulkanVersion,
-                GpuStatsInfo::Driver driver, bool isDriverLoaded, int64_t driverLoadingTime);
+    // Insert new gpu driver stats into global stats and app stats.
+    void insertDriverStats(const std::string& driverPackageName,
+                           const std::string& driverVersionName, uint64_t driverVersionCode,
+                           int64_t driverBuildTime, const std::string& appPackageName,
+                           const int32_t vulkanVersion, GpuStatsInfo::Driver driver,
+                           bool isDriverLoaded, int64_t driverLoadingTime);
     // Insert target stats into app stats or potentially global stats as well.
     void insertTargetStats(const std::string& appPackageName, const uint64_t driverVersionCode,
                            const GpuStatsInfo::Stats stats, const uint64_t value);
diff --git a/services/gpuservice/tests/unittests/Android.bp b/services/gpuservice/tests/unittests/Android.bp
new file mode 100644
index 0000000..fee5bd4
--- /dev/null
+++ b/services/gpuservice/tests/unittests/Android.bp
@@ -0,0 +1,34 @@
+// 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.
+
+cc_test {
+    name: "gpuservice_unittest",
+    test_suites: ["device-tests"],
+    sanitize: {
+        address: true,
+    },
+    srcs: [
+        "GpuStatsTest.cpp",
+    ],
+    shared_libs: [
+        "libcutils",
+        "libgfxstats",
+        "libgraphicsenv",
+        "liblog",
+        "libutils",
+    ],
+    static_libs: [
+        "libgmock",
+    ],
+}
diff --git a/services/gpuservice/tests/unittests/AndroidTest.xml b/services/gpuservice/tests/unittests/AndroidTest.xml
new file mode 100644
index 0000000..66f51c7
--- /dev/null
+++ b/services/gpuservice/tests/unittests/AndroidTest.xml
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- 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.
+-->
+<configuration description="Config for gpuservice_unittest">
+    <target_preparer class="com.android.tradefed.targetprep.PushFilePreparer">
+        <option name="cleanup" value="true" />
+        <option name="push" value="gpuservice_unittest->/data/local/tmp/gpuservice_unittest" />
+    </target_preparer>
+    <option name="test-suite-tag" value="apct" />
+    <test class="com.android.tradefed.testtype.GTest" >
+        <option name="native-test-device-path" value="/data/local/tmp" />
+        <option name="module-name" value="gpuservice_unittest" />
+    </test>
+</configuration>
diff --git a/services/gpuservice/tests/unittests/GpuStatsTest.cpp b/services/gpuservice/tests/unittests/GpuStatsTest.cpp
new file mode 100644
index 0000000..276a334
--- /dev/null
+++ b/services/gpuservice/tests/unittests/GpuStatsTest.cpp
@@ -0,0 +1,257 @@
+/*
+ * 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 "gpuservice_unittest"
+
+#include <cutils/properties.h>
+#include <gmock/gmock.h>
+#include <gpustats/GpuStats.h>
+#include <gtest/gtest.h>
+#include <utils/String16.h>
+#include <utils/Vector.h>
+
+namespace android {
+namespace {
+
+using testing::HasSubstr;
+
+// clang-format off
+#define BUILTIN_DRIVER_PKG_NAME   "system"
+#define BUILTIN_DRIVER_VER_NAME   "0"
+#define BUILTIN_DRIVER_VER_CODE   0
+#define BUILTIN_DRIVER_BUILD_TIME 123
+#define UPDATED_DRIVER_PKG_NAME   "updated"
+#define UPDATED_DRIVER_VER_NAME   "1"
+#define UPDATED_DRIVER_VER_CODE   1
+#define UPDATED_DRIVER_BUILD_TIME 234
+#define VULKAN_VERSION            345
+#define CPU_VULKAN_VERSION        456
+#define OPENGLES_VERSION          567
+#define APP_PKG_NAME_1            "testapp1"
+#define APP_PKG_NAME_2            "testapp2"
+#define DRIVER_LOADING_TIME_1     678
+#define DRIVER_LOADING_TIME_2     789
+#define DRIVER_LOADING_TIME_3     891
+
+enum InputCommand : int32_t {
+    DUMP_ALL               = 0,
+    DUMP_GLOBAL            = 1,
+    DUMP_APP               = 2,
+    DUMP_ALL_THEN_CLEAR    = 3,
+    DUMP_GLOBAL_THEN_CLEAR = 4,
+    DUMP_APP_THEN_CLEAR    = 5,
+};
+// clang-format on
+
+class GpuStatsTest : public testing::Test {
+public:
+    GpuStatsTest() {
+        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());
+    }
+
+    ~GpuStatsTest() {
+        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());
+    }
+
+    std::string inputCommand(InputCommand cmd);
+
+    void SetUp() override {
+        property_set("ro.cpuvulkan.version", std::to_string(CPU_VULKAN_VERSION).c_str());
+        property_set("ro.opengles.version", std::to_string(OPENGLES_VERSION).c_str());
+        mCpuVulkanVersion = property_get_int32("ro.cpuvulkan.version", CPU_VULKAN_VERSION);
+        mGlesVersion = property_get_int32("ro.opengles.version", OPENGLES_VERSION);
+    }
+
+    std::unique_ptr<GpuStats> mGpuStats = std::make_unique<GpuStats>();
+    int32_t mCpuVulkanVersion = 0;
+    int32_t mGlesVersion = 0;
+};
+
+std::string GpuStatsTest::inputCommand(InputCommand cmd) {
+    std::string result;
+    Vector<String16> args;
+
+    switch (cmd) {
+        case InputCommand::DUMP_ALL:
+            break;
+        case InputCommand::DUMP_GLOBAL:
+            args.push_back(String16("--global"));
+            break;
+        case InputCommand::DUMP_APP:
+            args.push_back(String16("--app"));
+            break;
+        case InputCommand::DUMP_ALL_THEN_CLEAR:
+            args.push_back(String16("--clear"));
+            break;
+        case InputCommand::DUMP_GLOBAL_THEN_CLEAR:
+            args.push_back(String16("--global"));
+            args.push_back(String16("--clear"));
+            break;
+        case InputCommand::DUMP_APP_THEN_CLEAR:
+            args.push_back(String16("--app"));
+            args.push_back(String16("--clear"));
+            break;
+    }
+
+    mGpuStats->dump(args, &result);
+    return result;
+}
+
+TEST_F(GpuStatsTest, statsEmptyByDefault) {
+    ASSERT_TRUE(inputCommand(InputCommand::DUMP_ALL).empty());
+}
+
+TEST_F(GpuStatsTest, canInsertBuiltinDriverStats) {
+    mGpuStats->insertDriverStats(BUILTIN_DRIVER_PKG_NAME, BUILTIN_DRIVER_VER_NAME,
+                                 BUILTIN_DRIVER_VER_CODE, BUILTIN_DRIVER_BUILD_TIME, APP_PKG_NAME_1,
+                                 VULKAN_VERSION, GpuStatsInfo::Driver::GL, true,
+                                 DRIVER_LOADING_TIME_1);
+
+    std::string expectedResult = "driverPackageName = " + std::string(BUILTIN_DRIVER_PKG_NAME);
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_GLOBAL), HasSubstr(expectedResult));
+    expectedResult = "driverVersionName = " + std::string(BUILTIN_DRIVER_VER_NAME);
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_GLOBAL), HasSubstr(expectedResult));
+    expectedResult = "driverVersionCode = " + std::to_string(BUILTIN_DRIVER_VER_CODE);
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_GLOBAL), HasSubstr(expectedResult));
+    expectedResult = "driverBuildTime = " + std::to_string(BUILTIN_DRIVER_BUILD_TIME);
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_GLOBAL), HasSubstr(expectedResult));
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_GLOBAL), HasSubstr("glLoadingCount = 1"));
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_GLOBAL), HasSubstr("glLoadingFailureCount = 0"));
+    expectedResult = "appPackageName = " + std::string(APP_PKG_NAME_1);
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_APP), HasSubstr(expectedResult));
+    expectedResult = "driverVersionCode = " + std::to_string(BUILTIN_DRIVER_VER_CODE);
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_APP), HasSubstr(expectedResult));
+    expectedResult = "glDriverLoadingTime: " + std::to_string(DRIVER_LOADING_TIME_1);
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_APP), HasSubstr(expectedResult));
+}
+
+TEST_F(GpuStatsTest, canInsertUpdatedDriverStats) {
+    mGpuStats->insertDriverStats(UPDATED_DRIVER_PKG_NAME, UPDATED_DRIVER_VER_NAME,
+                                 UPDATED_DRIVER_VER_CODE, UPDATED_DRIVER_BUILD_TIME, APP_PKG_NAME_2,
+                                 VULKAN_VERSION, GpuStatsInfo::Driver::VULKAN_UPDATED, false,
+                                 DRIVER_LOADING_TIME_2);
+
+    std::string expectedResult = "driverPackageName = " + std::string(UPDATED_DRIVER_PKG_NAME);
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_GLOBAL), HasSubstr(expectedResult));
+    expectedResult = "driverVersionName = " + std::string(UPDATED_DRIVER_VER_NAME);
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_GLOBAL), HasSubstr(expectedResult));
+    expectedResult = "driverVersionCode = " + std::to_string(UPDATED_DRIVER_VER_CODE);
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_GLOBAL), HasSubstr(expectedResult));
+    expectedResult = "driverBuildTime = " + std::to_string(UPDATED_DRIVER_BUILD_TIME);
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_GLOBAL), HasSubstr(expectedResult));
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_GLOBAL), HasSubstr("vkLoadingCount = 1"));
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_GLOBAL), HasSubstr("vkLoadingFailureCount = 1"));
+    expectedResult = "appPackageName = " + std::string(APP_PKG_NAME_2);
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_APP), HasSubstr(expectedResult));
+    expectedResult = "driverVersionCode = " + std::to_string(UPDATED_DRIVER_VER_CODE);
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_APP), HasSubstr(expectedResult));
+    expectedResult = "vkDriverLoadingTime: " + std::to_string(DRIVER_LOADING_TIME_2);
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_APP), HasSubstr(expectedResult));
+}
+
+TEST_F(GpuStatsTest, canInsertAngleDriverStats) {
+    mGpuStats->insertDriverStats(UPDATED_DRIVER_PKG_NAME, UPDATED_DRIVER_VER_NAME,
+                                 UPDATED_DRIVER_VER_CODE, UPDATED_DRIVER_BUILD_TIME, APP_PKG_NAME_2,
+                                 VULKAN_VERSION, GpuStatsInfo::Driver::ANGLE, true,
+                                 DRIVER_LOADING_TIME_3);
+
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_GLOBAL), HasSubstr("angleLoadingCount = 1"));
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_GLOBAL), HasSubstr("angleLoadingFailureCount = 0"));
+    std::string expectedResult = "angleDriverLoadingTime: " + std::to_string(DRIVER_LOADING_TIME_3);
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_APP), HasSubstr(expectedResult));
+}
+
+TEST_F(GpuStatsTest, canDump3dApiVersion) {
+    mGpuStats->insertDriverStats(BUILTIN_DRIVER_PKG_NAME, BUILTIN_DRIVER_VER_NAME,
+                                 BUILTIN_DRIVER_VER_CODE, BUILTIN_DRIVER_BUILD_TIME, APP_PKG_NAME_1,
+                                 VULKAN_VERSION, GpuStatsInfo::Driver::GL, true,
+                                 DRIVER_LOADING_TIME_1);
+
+    std::string expectedResult = "vulkanVersion = " + std::to_string(VULKAN_VERSION);
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_GLOBAL), HasSubstr(expectedResult));
+    expectedResult = "cpuVulkanVersion = " + std::to_string(mCpuVulkanVersion);
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_GLOBAL), HasSubstr(expectedResult));
+    expectedResult = "glesVersion = " + std::to_string(mGlesVersion);
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_GLOBAL), HasSubstr(expectedResult));
+}
+
+TEST_F(GpuStatsTest, canNotInsertTargetStatsBeforeProperSetup) {
+    mGpuStats->insertTargetStats(APP_PKG_NAME_1, BUILTIN_DRIVER_VER_CODE,
+                                 GpuStatsInfo::Stats::CPU_VULKAN_IN_USE, 0);
+    mGpuStats->insertTargetStats(APP_PKG_NAME_1, BUILTIN_DRIVER_VER_CODE,
+                                 GpuStatsInfo::Stats::FALSE_PREROTATION, 0);
+    mGpuStats->insertTargetStats(APP_PKG_NAME_1, BUILTIN_DRIVER_VER_CODE,
+                                 GpuStatsInfo::Stats::GLES_1_IN_USE, 0);
+
+    EXPECT_TRUE(inputCommand(InputCommand::DUMP_APP).empty());
+}
+
+TEST_F(GpuStatsTest, canInsertTargetStatsAfterProperSetup) {
+    mGpuStats->insertDriverStats(BUILTIN_DRIVER_PKG_NAME, BUILTIN_DRIVER_VER_NAME,
+                                 BUILTIN_DRIVER_VER_CODE, BUILTIN_DRIVER_BUILD_TIME, APP_PKG_NAME_1,
+                                 VULKAN_VERSION, GpuStatsInfo::Driver::GL, true,
+                                 DRIVER_LOADING_TIME_1);
+    mGpuStats->insertTargetStats(APP_PKG_NAME_1, BUILTIN_DRIVER_VER_CODE,
+                                 GpuStatsInfo::Stats::CPU_VULKAN_IN_USE, 0);
+    mGpuStats->insertTargetStats(APP_PKG_NAME_1, BUILTIN_DRIVER_VER_CODE,
+                                 GpuStatsInfo::Stats::FALSE_PREROTATION, 0);
+    mGpuStats->insertTargetStats(APP_PKG_NAME_1, BUILTIN_DRIVER_VER_CODE,
+                                 GpuStatsInfo::Stats::GLES_1_IN_USE, 0);
+
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_APP), HasSubstr("cpuVulkanInUse = 1"));
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_APP), HasSubstr("falsePrerotation = 1"));
+    EXPECT_THAT(inputCommand(InputCommand::DUMP_APP), HasSubstr("gles1InUse = 1"));
+}
+
+TEST_F(GpuStatsTest, canDumpAllBeforeClearAll) {
+    mGpuStats->insertDriverStats(BUILTIN_DRIVER_PKG_NAME, BUILTIN_DRIVER_VER_NAME,
+                                 BUILTIN_DRIVER_VER_CODE, BUILTIN_DRIVER_BUILD_TIME, APP_PKG_NAME_1,
+                                 VULKAN_VERSION, GpuStatsInfo::Driver::GL, true,
+                                 DRIVER_LOADING_TIME_1);
+
+    EXPECT_FALSE(inputCommand(InputCommand::DUMP_ALL_THEN_CLEAR).empty());
+    EXPECT_TRUE(inputCommand(InputCommand::DUMP_ALL).empty());
+}
+
+TEST_F(GpuStatsTest, canDumpGlobalBeforeClearGlobal) {
+    mGpuStats->insertDriverStats(BUILTIN_DRIVER_PKG_NAME, BUILTIN_DRIVER_VER_NAME,
+                                 BUILTIN_DRIVER_VER_CODE, BUILTIN_DRIVER_BUILD_TIME, APP_PKG_NAME_1,
+                                 VULKAN_VERSION, GpuStatsInfo::Driver::GL, true,
+                                 DRIVER_LOADING_TIME_1);
+
+    EXPECT_FALSE(inputCommand(InputCommand::DUMP_GLOBAL_THEN_CLEAR).empty());
+    EXPECT_TRUE(inputCommand(InputCommand::DUMP_GLOBAL).empty());
+    EXPECT_FALSE(inputCommand(InputCommand::DUMP_APP).empty());
+}
+
+TEST_F(GpuStatsTest, canDumpAppBeforeClearApp) {
+    mGpuStats->insertDriverStats(BUILTIN_DRIVER_PKG_NAME, BUILTIN_DRIVER_VER_NAME,
+                                 BUILTIN_DRIVER_VER_CODE, BUILTIN_DRIVER_BUILD_TIME, APP_PKG_NAME_1,
+                                 VULKAN_VERSION, GpuStatsInfo::Driver::GL, true,
+                                 DRIVER_LOADING_TIME_1);
+
+    EXPECT_FALSE(inputCommand(InputCommand::DUMP_APP_THEN_CLEAR).empty());
+    EXPECT_TRUE(inputCommand(InputCommand::DUMP_APP).empty());
+    EXPECT_FALSE(inputCommand(InputCommand::DUMP_GLOBAL).empty());
+}
+
+} // namespace
+} // namespace android