feat: Add Unittest example

CMakeLists.txt

@@ -21,3 +21,12 @@ target_compile_features(hello PRIVATE cxx_std_23)
 target_compile_options(hello PRIVATE ${BASE_OPTIONS})
 target_compile_definitions(hello PRIVATE ${BASE_DEFINITIONS})
 target_link_libraries(hello PRIVATE fmt::fmt)
+
+option(BUILD_TESTING OFF "Build Unity/CMock test suites")
+if (BUILD_TESTING AND NOT IS_EMSCRIPTEN)
+    set(CMAKE_SKIP_TEST_ALL_DEPENDENCY FALSE)
+    enable_testing()
+    find_package(Unity REQUIRED)
+    find_package(CMock REQUIRED)
+    add_subdirectory(tests)
+endif()

tests/CMakeLists.txt

@@ -0,0 +1,50 @@
+set(MOCK_GEN_DIR "${CMAKE_CURRENT_BINARY_DIR}/mocks")
+file(MAKE_DIRECTORY "${MOCK_GEN_DIR}")
+
+function(cmock_generate_mock target header)
+    cmake_parse_arguments(ARG "" "" "CONFIG" ${ARGN})
+    if (NOT RUBY_EXECUTABLE)
+        message(FATAL_ERROR "Ruby is required for CMock generation")
+    endif()
+    get_filename_component(name "${header}" NAME_WE)
+    get_filename_component(header_dir "${header}" DIRECTORY)
+    set(mock_src "${MOCK_GEN_DIR}/Mock${name}.c")
+    set(mock_hdr "${MOCK_GEN_DIR}/Mock${name}.h")
+    if (ARG_CONFIG)
+        set(CMOCK_CONFIG_FLAG "-o${ARG_CONFIG}")
+        set(CMOCK_CONFIG_DEPENDS "${ARG_CONFIG}")
+    endif()
+    add_custom_command(
+        OUTPUT  "${mock_src}" "${mock_hdr}"
+        COMMAND "${RUBY_EXECUTABLE}" "${CMOCK_SCRIPT}"
+                ${CMOCK_CONFIG_FLAG}
+                "--mock_path=${MOCK_GEN_DIR}"
+                "${header}"
+        DEPENDS "${header}" ${CMOCK_CONFIG_DEPENDS}
+        COMMENT "CMock: generating Mock${name}"
+        VERBATIM
+    )
+    target_sources("${target}" PRIVATE "${mock_src}")
+    target_include_directories("${target}" PRIVATE "${MOCK_GEN_DIR}" "${header_dir}")
+endfunction()
+
+set(TEST_TARGETS "")
+
+find_package(asio REQUIRED)
+
+add_executable(test_example test_example.cpp)
+target_include_directories(test_example PRIVATE "${CMAKE_SOURCE_DIR}")
+target_link_libraries(test_example PRIVATE Unity::Unity)
+target_compile_features(test_example PRIVATE cxx_std_23)
+add_test(NAME test_example COMMAND test_example)
+list(APPEND TEST_TARGETS test_example)
+
+add_custom_target(check
+    COMMAND ${CMAKE_CTEST_COMMAND}
+            --test-dir "${CMAKE_BINARY_DIR}"
+            --output-on-failure
+            --progress
+    WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
+    USES_TERMINAL
+    DEPENDS ${TEST_TARGETS}
+)

tests/test_example.cpp

@@ -0,0 +1,14 @@
+#include "unity.h"
+
+void setUp() {}
+void tearDown() {}
+
+void test_example() {
+    TEST_ASSERT_TRUE(true);
+}
+
+auto main() -> int {
+    UNITY_BEGIN();
+    RUN_TEST(test_example);
+    return UNITY_END();
+}