Enable sapi_test target in CMake, add Benchmark dependency

PiperOrigin-RevId: 281719298
Change-Id: Idd2570fff4907c81cdab1070bd1f3e41e29c76f6

cmake/SapiDeps.cmake

@@ -34,6 +34,11 @@ if(SAPI_ENABLE_TESTS)
   check_target(gtest)
   check_target(gtest_main)
   check_target(gmock)
+
+  if(SAPI_USE_BENCHMARK)
+    include(cmake/benchmark/Download.cmake)
+  endif()
+  check_target(benchmark)
 endif()
 
 if(SAPI_USE_ABSL)

cmake/SapiOptions.cmake

@@ -21,6 +21,7 @@
 # depend on some of these libraries (e.g. Abseil).
 option(SAPI_USE_ABSL "Download Abseil at config time" ON)
 option(SAPI_USE_GOOGLETEST "Download googletest at config time" ON)
+option(SAPI_USE_BENCHMARK "Download benchmark at config time" ON)
 option(SAPI_USE_GFLAGS "Download gflags at config time" ON)
 option(SAPI_USE_GLOG "Download glog at config time" ON)
 option(SAPI_USE_PROTOBUF "Download protobuf at config time" ON)

cmake/benchmark/CMakeLists.txt.in

@@ -0,0 +1,28 @@
+# Copyright 2019 Google LLC. All Rights Reserved.
+#
+# 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.
+
+cmake_minimum_required(VERSION 3.10)
+project(benchmark-download NONE)
+
+include(ExternalProject)
+ExternalProject_Add(benchmark
+  GIT_REPOSITORY    https://github.com/google/benchmark.git
+  GIT_TAG           090faecb454fbd6e6e17a75ef8146acb037118d4  # 2019-05-13
+  SOURCE_DIR        "${CMAKE_BINARY_DIR}/benchmark-src"
+  BINARY_DIR        "${CMAKE_BINARY_DIR}/benchmark-build"
+  CONFIGURE_COMMAND ""
+  BUILD_COMMAND     ""
+  INSTALL_COMMAND   ""
+  TEST_COMMAND      ""
+)

cmake/benchmark/Download.cmake

@@ -0,0 +1,40 @@
+# Copyright 2019 Google LLC. All Rights Reserved.
+#
+# 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.
+
+# Downloads and unpacks Benchmark at configure time
+
+set(workdir "${CMAKE_BINARY_DIR}/benchmark-download")
+
+configure_file("${CMAKE_CURRENT_LIST_DIR}/CMakeLists.txt.in"
+               "${workdir}/CMakeLists.txt")
+execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
+                RESULT_VARIABLE error
+                WORKING_DIRECTORY "${workdir}")
+if(error)
+  message(FATAL_ERROR "CMake step for ${PROJECT_NAME} failed: ${error}")
+endif()
+
+execute_process(COMMAND ${CMAKE_COMMAND} --build .
+                RESULT_VARIABLE error
+                WORKING_DIRECTORY "${workdir}")
+if(error)
+  message(FATAL_ERROR "Build step for ${PROJECT_NAME} failed: ${error}")
+endif()
+
+set(BENCHMARK_ENABLE_TESTING OFF)
+set(BENCHMARK_ENABLE_EXCEPTIONS OFF)
+set(BENCHMARK_ENABLE_GTEST_TESTS OFF)
+
+add_subdirectory("${CMAKE_BINARY_DIR}/benchmark-src"
+                 "${CMAKE_BINARY_DIR}/benchmark-build" EXCLUDE_FROM_ALL)

sandboxed_api/CMakeLists.txt

@@ -168,5 +168,20 @@ target_link_libraries(sapi_client PRIVATE
   sapi::vars
 )
 
+if(SAPI_ENABLE_TESTS)
   # sandboxed_api:sapi_test
-# TODO(cblichmann): Add sapi_test once generator can be invoked via CMake
+  add_executable(sapi_test
+    sapi_test.cc
+  )
+  target_link_libraries(sapi_test PRIVATE
+    absl::memory
+    benchmark
+    sapi::sapi
+    sapi::status
+    sapi::status_matchers
+    sapi::stringop_sapi
+    sapi::sum_sapi
+    sapi::test_main
+  )
+  gtest_discover_tests(sapi_test)
+endif()