build(cmake): isolate test-only dependencies

CMakeLists.txt

@@ -22,6 +22,7 @@ if(NOT CMAKE_SIZEOF_VOID_P EQUAL 8)
     message(FATAL_ERROR "FESA requires a 64-bit target.")
 endif()
 
+include(CTest)
 include(cmake/FesaDependencies.cmake)
 
 add_library(fesa_core STATIC
@@ -44,8 +45,6 @@ target_link_libraries(fesa PRIVATE fesa_core)
 target_compile_features(fesa PRIVATE cxx_std_20)
 target_compile_options(fesa PRIVATE /W4 /permissive- /EHsc)
 
-include(CTest)
-
 if(BUILD_TESTING)
     add_subdirectory(tests)
 endif()

cmake/FesaDependencies.cmake

@@ -12,7 +12,10 @@ set(MKL_THREADING tbb_thread)
 find_package(MKL CONFIG REQUIRED)
 find_package(TBB CONFIG REQUIRED COMPONENTS tbb)
 find_package(HDF5 CONFIG REQUIRED COMPONENTS C shared)
-find_package(GTest CONFIG REQUIRED)
+
+if(BUILD_TESTING)
+    find_package(GTest CONFIG REQUIRED)
+endif()
 
 function(fesa_require_imported_target target_name)
     if(NOT TARGET "${target_name}")
@@ -36,9 +39,12 @@ endfunction()
 fesa_require_imported_target(MKL::MKL)
 fesa_require_imported_target(TBB::tbb)
 fesa_require_imported_target(hdf5::hdf5-shared)
-fesa_require_imported_target(GTest::gtest_main)
-fesa_require_imported_target(GTest::gtest)
-fesa_require_imported_target(GTest::gmock)
+
+if(BUILD_TESTING)
+    fesa_require_imported_target(GTest::gtest_main)
+    fesa_require_imported_target(GTest::gtest)
+    fesa_require_imported_target(GTest::gmock)
+endif()
 
 add_library(HDF5::HDF5 INTERFACE IMPORTED GLOBAL)
 set_property(

tests/CMakeLists.txt

@@ -37,11 +37,29 @@ set_property(
         ${FESA_DEPENDENCY_RUNTIME_MODIFICATIONS}
 )
 
+add_test(
+    NAME ProductionConfigureWithoutGTest
+    COMMAND
+        "${CMAKE_COMMAND}"
+        --fresh
+        -S "${CMAKE_SOURCE_DIR}"
+        -B "${CMAKE_BINARY_DIR}/testing/production-no-gtest"
+        -G "${CMAKE_GENERATOR}"
+        -A "${CMAKE_GENERATOR_PLATFORM}"
+        -T "${CMAKE_VS_PLATFORM_TOOLSET}"
+        -DBUILD_TESTING=OFF
+        -DCMAKE_DISABLE_FIND_PACKAGE_GTest=TRUE
+        "-DMKL_DIR=${MKL_DIR}"
+        "-DTBB_DIR=${TBB_DIR}"
+        "-DHDF5_DIR=${HDF5_DIR}"
+)
+
 add_executable(fesa_core_value_tests
     unit/core/diagnostic_test.cpp
     unit/core/entity_id_test.cpp
     unit/core/status_test.cpp
     unit/core/vec3_test.cpp
+    unit/core/version_test.cpp
 )
 
 target_compile_features(fesa_core_value_tests PRIVATE cxx_std_20)

tests/unit/core/version_test.cpp

@@ -0,0 +1,11 @@
+#include <gtest/gtest.h>
+
+#include <fesa/core/version.hpp>
+
+namespace {
+
+TEST(Version, ReportsPhaseOneSemanticVersion) {
+    EXPECT_EQ(fesa::version(), "0.1.0");
+}
+
+}  // namespace

tests/unit/dependencies/dependency_smoke_test.cpp

@@ -11,6 +11,8 @@
 
 namespace {
 
+static_assert(sizeof(MKL_INT) == 4, "FESA requires the oneMKL LP64 interface.");
+
 TEST(DependencySmoke, CallsOneMklVectorOperation) {
     constexpr std::array<double, 3> x{1.0, 2.0, 3.0};
     std::array<double, 3> y{4.0, 5.0, 6.0};