google/googletest

提供 xUnit 架構、自動測試發現、豐富斷言、死亡測試與值/型別參數化測試，並支援 Chromium、LLVM 等專案。要求 C++17，官方文件完整，適合 C++ 專案建立單元測試與 Mock。 Provides xUnit architecture, auto test discovery, rich assertions, death tests, and parameterized tests, used by Chromium and LLVM. Requires C++17; official docs are complete, making it highly mature for C++ unit testing and mocking.