MdePkg/Test: Add DevicePathLib host test module

This commit adds host-based unit tests for device path lib.

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@bysoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Signed-off-by: Mateusz Albecki <mateusz.albecki@intel.com>
Reviewed-by: Michael D Kinney <Michael.d.kinney@intel.com>

MdePkg/Test/UnitTest/Library/DevicePathLib/TestDevicePathLib.h

@@ -0,0 +1,26 @@
+/** @file
+  UEFI OS based application for unit testing the DevicePathLib.
+
+  Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#ifndef __TEST_DEVICE_PATH_LIB_H__
+#define __TEST_DEVICE_PATH_LIB_H__
+
+#include <PiPei.h>
+#include <Uefi.h>
+#include <Library/UefiLib.h>
+#include <Library/DebugLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/UnitTestLib.h>
+#include <Protocol/DevicePath.h>
+#include <Library/DevicePathLib.h>
+#include <stdint.h>
+
+EFI_STATUS
+CreateDevicePathStringConversionsTestSuite (
+  IN UNIT_TEST_FRAMEWORK_HANDLE  Framework
+  );
+
+#endif