Add helper function to build unittest

Author: Bill-hbrhbr

CMake/ystdlib-cpp-helpers.cmake

@@ -33,3 +33,29 @@ function(cpp_library)
     target_compile_features(${arg_cpp_lib_NAME} INTERFACE cxx_std_20)
     add_library(${arg_cpp_lib_NAMESPACE}::${arg_cpp_lib_NAME} ALIAS ${arg_cpp_lib_NAME})
 endfunction()
+
+# Adds the current C++ library's unit test source files and dependencies to global list variables
+# used to build the Catch2 unit test target.
+# NOTE: There's no need to specify Catch2 related dependencies.
+#
+# @param SRCS
+# @param DEPS
+function(cpp_test)
+    set(options "")
+    set(oneValueArgs "")
+    set(multiValueArgs
+        SRCS
+        DEPS
+    )
+    cmake_parse_arguments(arg_cpp_test "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
+
+    file(RELATIVE_PATH SRC_DIR "${PROJECT_SOURCE_DIR}" "${CMAKE_CURRENT_LIST_DIR}")
+
+    foreach(SRC_FILE IN LISTS arg_cpp_test_SRCS)
+        list(APPEND SOURCE_FILES_unitTest ${SRC_DIR}/${SRC_FILE})
+    endforeach()
+    set(SOURCE_FILES_unitTest "${SOURCE_FILES_unitTest}" CACHE INTERNAL "")
+
+    list(APPEND LIB_DEPS_unitTest "${arg_cpp_test_DEPS}")
+    set(LIB_DEPS_unitTest "${LIB_DEPS_unitTest}" CACHE INTERNAL "")
+endfunction()

CMakeLists.txt

@@ -22,14 +22,13 @@ endif()
 list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR}/CMake)
 include(ystdlib-cpp-helpers)
 
+# Initiate unit test global list variables
+set(SOURCE_FILES_unitTest "" CACHE INTERNAL "")
+set(LIB_DEPS_unitTest "Catch2::Catch2WithMain" CACHE INTERNAL "")
+
 add_subdirectory(src/ystdlib)
 
 add_executable(unitTest)
-target_sources(unitTest PRIVATE src/main.cpp)
-target_link_libraries(
-    unitTest
-    PRIVATE
-        ystdlib::testlib
-        Catch2::Catch2WithMain
-)
+target_sources(unitTest PRIVATE ${SOURCE_FILES_unitTest})
+target_link_libraries(unitTest PRIVATE ${LIB_DEPS_unitTest})
 target_compile_features(unitTest PRIVATE cxx_std_20)

src/ystdlib/testlib/CMakeLists.txt

@@ -1 +1,2 @@
 cpp_library(NAME testlib NAMESPACE ystdlib)
+cpp_test(SRCS test-hello.cpp DEPS ystdlib::testlib)