Rewrite C++ API tests in gtest (#11953)

Summary:
This PR is a large codemod to rewrite all C++ API tests with GoogleTest (gtest) instead of Catch.

You can largely trust me to have correctly code-modded the tests, so it's not required to review every of the 2000+ changed lines. However, additional things I changed were:

1. Moved the cmake parts for these tests into their own `CMakeLists.txt` under `test/cpp/api` and calling `add_subdirectory` from `torch/CMakeLists.txt`
2. Fixing DataParallel tests which weren't being compiled because `USE_CUDA` wasn't correctly being set at all.
3. Updated README

ezyang ebetica
Pull Request resolved: https://github.com/pytorch/pytorch/pull/11953

Differential Revision: D9998883

Pulled By: goldsborough

fbshipit-source-id: affe3f320b0ca63e7e0019926a59076bb943db80

1 files changed, 2 insertions, 66 deletions

diff --git a/torch/CMakeLists.txt b/torch/CMakeLists.txt
index c8ead88e30..be13aaa61b 100644
--- a/torch/CMakeLists.txt
+++ b/torch/CMakeLists.txt
@@ -243,7 +243,7 @@ if (NOT NO_API AND NOT USE_ROCM)
     ${TORCH_SRC_DIR}/csrc/api/src/serialize/input-archive.cpp
     ${TORCH_SRC_DIR}/csrc/api/src/serialize/output-archive.cpp
     ${TORCH_SRC_DIR}/csrc/api/src/utils.cpp
-    )
+  )
 endif()
 
 
@@ -434,71 +434,7 @@ if (BUILD_TEST AND NOT MSVC AND NOT APPLE AND NOT USE_ROCM)
 endif()
 
 if (BUILD_TEST AND NOT NO_API AND NOT USE_ROCM)
-
-  #Catch test of api.
-  #TODO: Change all these tests to Google test.
-  set(TORCH_API_TEST_DIR "${TORCH_ROOT}/test/cpp/api")
-  set(TORCH_API_TEST_SOURCES
-    ${TORCH_API_TEST_DIR}/any.cpp
-    ${TORCH_API_TEST_DIR}/cursor.cpp
-    ${TORCH_API_TEST_DIR}/integration.cpp
-    ${TORCH_API_TEST_DIR}/jit.cpp
-    ${TORCH_API_TEST_DIR}/main.cpp
-    ${TORCH_API_TEST_DIR}/misc.cpp
-    ${TORCH_API_TEST_DIR}/module.cpp
-    ${TORCH_API_TEST_DIR}/modules.cpp
-    ${TORCH_API_TEST_DIR}/optim.cpp
-    ${TORCH_API_TEST_DIR}/parallel.cpp
-    ${TORCH_API_TEST_DIR}/rnn.cpp
-    ${TORCH_API_TEST_DIR}/sequential.cpp
-    ${TORCH_API_TEST_DIR}/serialize.cpp
-    ${TORCH_API_TEST_DIR}/tensor_cuda.cpp
-    ${TORCH_API_TEST_DIR}/tensor_options_cuda.cpp
-    ${TORCH_API_TEST_DIR}/tensor_options.cpp
-    ${TORCH_API_TEST_DIR}/tensor.cpp
-  )
-
-  add_executable(test_api ${TORCH_API_TEST_SOURCES})
-
-  target_include_directories(test_api
-    PUBLIC
-    "${TORCH_ROOT}/third_party/catch/single_include"
-    ${ATen_CPU_INCLUDE})
-
-  target_link_libraries(test_api torch ${TORCH_CUDA_LIBRARIES} ${CUDA_NVRTC_LIB} ${CUDA_CUDA_LIB})
-
-   #Google test of api.
-   set(TORCH_API_GTEST_DIR "${TORCH_ROOT}/test/cpp/api/")
-   add_executable(gtest_api
-		${TORCH_API_GTEST_DIR}/static.cpp
-		)
-   target_include_directories(gtest_api PRIVATE ${ATen_CPU_INCLUDE})
-   target_link_libraries(gtest_api torch gtest_main)
-   if (USE_CUDA)
-      target_link_libraries(gtest_api ${CUDA_LIBRARIES} ${CUDA_NVRTC_LIB} ${CUDA_CUDA_LIB} ${TORCH_CUDA_LIBRARIES})
-   endif()
-
-  #Adding compile options for both tests.
-  if (NOT MSVC)
-    if (APPLE)
-      target_compile_options(test_api PRIVATE
-        # Clang has an unfixed bug leading to spurious missing braces
-        # warnings, see https://bugs.llvm.org/show_bug.cgi?id=21629
-        -Wno-missing-braces)
-      target_compile_options(gtest_api PRIVATE
-        -Wno-missing-braces)
-	else()
-      target_compile_options(test_api PRIVATE
-        # Considered to be flaky.  See the discussion at
-        # https://github.com/pytorch/pytorch/pull/9608
-        -Wno-maybe-uninitialized
-        # gcc gives nonsensical warnings about variadic.h
-        -Wno-unused-but-set-parameter)
-     target_compile_options(gtest_api PRIVATE
-		-Wno-maybe-uninitialized
-		-Wno-unused-but-set-parameter)
-    endif()
-  endif()
+  add_subdirectory(${TORCH_ROOT}/test/cpp/api ${CMAKE_BINARY_DIR}/test_api)
 endif()
 
 if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")