diff --git a/health/storage/1.0/vts/functional/Android.bp b/health/storage/1.0/vts/functional/Android.bp
index 2201031..731ad62 100644
--- a/health/storage/1.0/vts/functional/Android.bp
+++ b/health/storage/1.0/vts/functional/Android.bp
@@ -19,6 +19,9 @@
     defaults: ["VtsHalTargetTestDefaults"],
     srcs: ["VtsHalHealthStorageV1_0TargetTest.cpp"],
     static_libs: ["android.hardware.health.storage@1.0"],
+    header_libs: [
+        "libhealth_storage_test_common_headers",
+    ],
     shared_libs: [
         "libhidlbase",
     ],
diff --git a/health/storage/1.0/vts/functional/VtsHalHealthStorageV1_0TargetTest.cpp b/health/storage/1.0/vts/functional/VtsHalHealthStorageV1_0TargetTest.cpp
index 24ddc5d..ddb6b5a 100644
--- a/health/storage/1.0/vts/functional/VtsHalHealthStorageV1_0TargetTest.cpp
+++ b/health/storage/1.0/vts/functional/VtsHalHealthStorageV1_0TargetTest.cpp
@@ -14,14 +14,17 @@
  * limitations under the License.
  */
 
+#include <unistd.h>
+
+#include <thread>
+
 #include <android-base/logging.h>
 #include <android/hardware/health/storage/1.0/IStorage.h>
 #include <gtest/gtest.h>
+#include <health-storage-test/common.h>
 #include <hidl/GtestPrinter.h>
 #include <hidl/HidlTransportSupport.h>
 #include <hidl/ServiceManagement.h>
-#include <unistd.h>
-#include <thread>
 
 namespace android {
 namespace hardware {
@@ -29,61 +32,17 @@
 namespace storage {
 namespace V1_0 {
 
+using namespace ::android::hardware::health::storage::test;
 using ::std::literals::chrono_literals::operator""ms;
 
 #define ASSERT_OK(ret) ASSERT_TRUE(ret.isOk()) << ret.description()
 
-// Dev GC timeout. This is the timeout used by vold.
-const uint64_t kDevGcTimeoutSec = 120;
-const std::chrono::seconds kDevGcTimeout{kDevGcTimeoutSec};
-// Dev GC timeout tolerance. The HAL may not immediately return after the
-// timeout, so include an acceptable tolerance.
-const std::chrono::seconds kDevGcTolerance{3};
-// Time accounted for RPC calls.
-const std::chrono::milliseconds kRpcTime{1000};
-
-template <typename R>
-std::string toString(std::chrono::duration<R, std::milli> time) {
-    return std::to_string(time.count()) + "ms";
-}
-
-/** An atomic boolean flag that indicates whether a task has finished. */
-class Flag {
-   public:
-    void onFinish() {
-        std::unique_lock<std::mutex> lock(mMutex);
-        onFinishLocked(&lock);
-    }
-    template <typename R, typename P>
-    bool wait(std::chrono::duration<R, P> duration) {
-        std::unique_lock<std::mutex> lock(mMutex);
-        return waitLocked(&lock, duration);
-    }
-
-   protected:
-    /** Will unlock. */
-    void onFinishLocked(std::unique_lock<std::mutex>* lock) {
-        mFinished = true;
-        lock->unlock();
-        mCv.notify_all();
-    }
-    template <typename R, typename P>
-    bool waitLocked(std::unique_lock<std::mutex>* lock, std::chrono::duration<R, P> duration) {
-        mCv.wait_for(*lock, duration, [this] { return mFinished; });
-        return mFinished;
-    }
-
-    bool mFinished{false};
-    std::mutex mMutex;
-    std::condition_variable mCv;
-};
-
 class GcCallback : public IGarbageCollectCallback, public Flag {
-   public:
+  public:
     Return<void> onFinish(Result result) override {
-        std::unique_lock<std::mutex> lock(mMutex);
-        mResult = result;
-        Flag::onFinishLocked(&lock);
+        std::unique_lock<std::mutex> lock(mutex_);
+        result_ = result;
+        Flag::OnFinishLocked(&lock);
         return Void();
     }
 
@@ -93,13 +52,13 @@
      */
     template <typename R, typename P>
     void waitForResult(std::chrono::duration<R, P> timeout, Result expected) {
-        std::unique_lock<std::mutex> lock(mMutex);
-        ASSERT_TRUE(waitLocked(&lock, timeout)) << "timeout after " << toString(timeout);
-        EXPECT_EQ(expected, mResult);
+        std::unique_lock<std::mutex> lock(mutex_);
+        ASSERT_TRUE(WaitLocked(&lock, timeout)) << "timeout after " << to_string(timeout);
+        EXPECT_EQ(expected, result_);
     }
 
-   private:
-    Result mResult{Result::UNKNOWN_ERROR};
+  private:
+    Result result_{Result::UNKNOWN_ERROR};
 };
 
 class HealthStorageHidlTest : public ::testing::TestWithParam<std::string> {
@@ -127,10 +86,10 @@
         auto pingFlag = std::make_shared<Flag>();
         std::thread([service, pingFlag] {
             service->ping();
-            pingFlag->onFinish();
+            pingFlag->OnFinish();
         })
             .detach();
-        return pingFlag->wait(timeout);
+        return pingFlag->Wait(timeout);
     }
 
     sp<IStorage> fs;
@@ -147,7 +106,7 @@
     // Hold test process because HAL can be single-threaded and doing GC.
     ASSERT_TRUE(ping(kDevGcTimeout + kDevGcTolerance + kRpcTime))
             << "Service must be available after "
-            << toString(kDevGcTimeout + kDevGcTolerance + kRpcTime);
+            << to_string(kDevGcTimeout + kDevGcTolerance + kRpcTime);
 }
 
 /**
diff --git a/health/storage/test_common/Android.bp b/health/storage/test_common/Android.bp
new file mode 100644
index 0000000..7c6bef4
--- /dev/null
+++ b/health/storage/test_common/Android.bp
@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 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.
+ */
+
+cc_library_headers {
+    name: "libhealth_storage_test_common_headers",
+    export_include_dirs: ["include"],
+}
diff --git a/health/storage/test_common/include/health-storage-test/common.h b/health/storage/test_common/include/health-storage-test/common.h
new file mode 100644
index 0000000..dfda830
--- /dev/null
+++ b/health/storage/test_common/include/health-storage-test/common.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 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.
+ */
+
+#pragma once
+
+#include <chrono>
+#include <string>
+
+namespace android::hardware::health::storage::test {
+
+// Dev GC timeout. This is the timeout used by vold.
+const uint64_t kDevGcTimeoutSec = 120;
+const std::chrono::seconds kDevGcTimeout{kDevGcTimeoutSec};
+// Dev GC timeout tolerance. The HAL may not immediately return after the
+// timeout, so include an acceptable tolerance.
+const std::chrono::seconds kDevGcTolerance{3};
+// Time accounted for RPC calls.
+const std::chrono::milliseconds kRpcTime{1000};
+
+template <typename R>
+std::string to_string(std::chrono::duration<R, std::milli> time) {
+    return std::to_string(time.count()) + "ms";
+}
+
+/** An atomic boolean flag that indicates whether a task has finished. */
+class Flag {
+  public:
+    void OnFinish() {
+        std::unique_lock<std::mutex> lock(mutex_);
+        OnFinishLocked(&lock);
+    }
+    template <typename R, typename P>
+    bool Wait(std::chrono::duration<R, P> duration) {
+        std::unique_lock<std::mutex> lock(mutex_);
+        return WaitLocked(&lock, duration);
+    }
+
+  protected:
+    /** Will unlock. */
+    void OnFinishLocked(std::unique_lock<std::mutex>* lock) {
+        finished_ = true;
+        lock->unlock();
+        cv_.notify_all();
+    }
+    template <typename R, typename P>
+    bool WaitLocked(std::unique_lock<std::mutex>* lock, std::chrono::duration<R, P> duration) {
+        cv_.wait_for(*lock, duration, [this] { return finished_; });
+        return finished_;
+    }
+
+    bool finished_{false};
+    std::mutex mutex_;
+    std::condition_variable cv_;
+};
+
+}  // namespace android::hardware::health::storage::test