Add target test that uses HIT to the top-level HIP cmake

Change-Id: Idae1c0b39e6c4deb9f8fdb192bab17b0904941d7

tests/hip_tests.txt

@@ -0,0 +1,12 @@
+cmake_minimum_required(VERSION 2.8.3)
+project(hip_tests)
+
+# Setup
+set(HIP_PATH @CMAKE_INSTALL_PREFIX@)
+set(ENV{HIP_PATH} ${HIP_PATH})
+set(HIP_SRC_PATH @hip_SOURCE_DIR@)
+set(CMAKE_MODULE_PATH "${HIP_PATH}/cmake" ${CMAKE_MODULE_PATH})
+include(${HIP_SRC_PATH}/tests/hit/HIT.cmake)
+
+# Add tests
+hit_add_directory(${HIP_SRC_PATH}/tests/src)