Introduce GoogleTest framework. (#204)

* Use googletest for tests. Add conv2d_fwd UT.

* Add conv1D/3D to gtest UT.

* Fix: not duplicate test with CTest.

* Convert more tests to googltests.

* Fix: GIT_SHALLOW is not allowed for git commit hash.

* Clang-format

* use integer value for GEMM test

Co-authored-by: Adam Osewski <aosewski@amd.com>
Co-authored-by: Chao Liu <chao.liu2@amd.com>
Co-authored-by: Chao Liu <lc.roy86@gmail.com>

cmake/googletest.cmake

@@ -0,0 +1,36 @@
+include(FetchContent)
+
+set(GOOGLETEST_DIR "" CACHE STRING "Location of local GoogleTest repo to build against")
+
+if(GOOGLETEST_DIR)
+  set(FETCHCONTENT_SOURCE_DIR_GOOGLETEST ${GOOGLETEST_DIR} CACHE STRING "GoogleTest source directory override")
+endif()
+
+message(STATUS "Fetching GoogleTest")
+
+list(APPEND GTEST_CMAKE_CXX_FLAGS 
+     -Wno-undef
+     -Wno-reserved-identifier
+     -Wno-global-constructors
+     -Wno-missing-noreturn
+     -Wno-disabled-macro-expansion
+     -Wno-used-but-marked-unused
+     -Wno-switch-enum
+     -Wno-zero-as-null-pointer-constant
+     -Wno-unused-member-function
+)
+message(STATUS "Suppressing googltest warnings with flags: ${GTEST_CMAKE_CXX_FLAGS}")
+
+FetchContent_Declare(
+  googletest
+  GIT_REPOSITORY https://github.com/google/googletest.git
+  GIT_TAG        b85864c64758dec007208e56af933fc3f52044ee
+)
+
+# Will be necessary for windows build
+# set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+FetchContent_MakeAvailable(googletest)
+
+target_compile_options(gtest PRIVATE ${GTEST_CMAKE_CXX_FLAGS})
+target_compile_options(gtest_main PRIVATE ${GTEST_CMAKE_CXX_FLAGS})
+