Build test dependencies only if BUILD_TESTING is set (#67)

# Pull Request

### What change is being made

Do not build test dependencies if `BUILD_TESTING` is `OFF`

### Why this change is being made

More control for consumers of the CMakeLists.txt

### Tested

Tested in control, good to go if CI passes.

GitOrigin-RevId: b3ac0f38af1cc0cbb30e5b138590be1d827e0c48

Author: awoll-bdai

control/CMakeLists.txt

@@ -6,8 +6,7 @@ project(exploy LANGUAGES CXX)
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-# Enable testing
-enable_testing()
+include(CTest)
 
 # Treat warnings as errors
 add_compile_options(-Werror -Wpedantic -Wunused-variable -Wunused-parameter -Wreorder)
@@ -17,7 +16,6 @@ find_package(Eigen3 REQUIRED)
 find_package(nlohmann_json REQUIRED)
 find_package(fmt REQUIRED)
 find_package(onnxruntime REQUIRED)
-find_package(GTest REQUIRED)
 
 # C++ Shared Library
 add_library(exploy SHARED
@@ -38,32 +36,37 @@ target_link_libraries(exploy PUBLIC
 )
 
 # Tests
-set(GEN_SCRIPT "${CMAKE_CURRENT_SOURCE_DIR}/test/testdata/test_onnx_generator.py")
-set(GEN_OUTPUT "${CMAKE_CURRENT_SOURCE_DIR}/test/testdata/test.onnx")
+if(BUILD_TESTING)
+  find_package(GTest REQUIRED)
+  find_package(Python3 REQUIRED COMPONENTS Interpreter)
 
-add_custom_command(
-    OUTPUT "${GEN_OUTPUT}"
-    COMMAND ${CMAKE_COMMAND} -E env PYTHONWARNINGS="ignore" python3 "${GEN_SCRIPT}" "${GEN_OUTPUT}"
-    DEPENDS "${GEN_SCRIPT}"
-    COMMENT "Generating test ONNX model..."
-)
+  set(GEN_SCRIPT "${CMAKE_CURRENT_SOURCE_DIR}/test/testdata/test_onnx_generator.py")
+  set(GEN_OUTPUT "${CMAKE_CURRENT_SOURCE_DIR}/test/testdata/test.onnx")
 
-add_executable(exploy_test
-    test/controller_test.cpp
-    test/components_test.cpp
-    test/context_test.cpp
-    test/logging_test.cpp
-    test/metadata_test.cpp
-    test/onnx_runtime_test.cpp
-    "${GEN_OUTPUT}"
-)
-target_compile_definitions(exploy_test PRIVATE
-    TEST_DATA_DIR="${CMAKE_CURRENT_SOURCE_DIR}/test/testdata"
-)
-target_link_libraries(exploy_test PRIVATE
-    exploy
-    GTest::gtest_main
-    GTest::gmock
-    fmt::fmt
-)
-add_test(NAME exploy_test COMMAND exploy_test)
+  add_custom_command(
+      OUTPUT "${GEN_OUTPUT}"
+      COMMAND ${CMAKE_COMMAND} -E env PYTHONWARNINGS="ignore" ${Python3_EXECUTABLE} "${GEN_SCRIPT}" "${GEN_OUTPUT}"
+      DEPENDS "${GEN_SCRIPT}"
+      COMMENT "Generating test ONNX model..."
+  )
+
+  add_executable(exploy_test
+      test/controller_test.cpp
+      test/components_test.cpp
+      test/context_test.cpp
+      test/logging_test.cpp
+      test/metadata_test.cpp
+      test/onnx_runtime_test.cpp
+      "${GEN_OUTPUT}"
+  )
+  target_compile_definitions(exploy_test PRIVATE
+      TEST_DATA_DIR="${CMAKE_CURRENT_SOURCE_DIR}/test/testdata"
+  )
+  target_link_libraries(exploy_test PRIVATE
+      exploy
+      GTest::gtest_main
+      GTest::gmock
+      fmt::fmt
+  )
+  add_test(NAME exploy_test COMMAND exploy_test)
+endif()