Add initial libraries and their respective test code

tests/CMakeLists.txt

@@ -0,0 +1,34 @@
+# Third Party
+include_directories(${GTEST_INCLUDE_DIR})
+
+link_directories(${GTEST_LIB_DIR})
+
+find_package(GTest REQUIRED)
+
+# tests
+file(GLOB_RECURSE TEST_SOURCES "*.cpp" "*.hpp")
+
+add_executable(tests ${TEST_SOURCES})
+target_link_libraries(tests ${LIBS})
+
+target_compile_options(tests PRIVATE $<$<CONFIG:Debug>:
+    -Wall -Wextra -pedantic-errors -Wconversion -Wsign-conversion
+    >)
+target_link_libraries(tests
+    PRIVATE
+    logger
+    safe_array
+    gtest
+    GTest::gtest_main
+)
+
+target_include_directories(tests
+    PUBLIC
+    ${CMAKE_MAIN_SOURCE_DIR}/external/**
+    ${CMAKE_CURRENT_LIST_DIR}
+    ${CMAKE_MAIN_SOURCE_DIR}/src/**
+    ${PROJECT_BINARY_DIR}
+)
+
+include(GoogleTest)
+gtest_discover_tests(tests)