> For the complete documentation index, see [llms.txt](https://easonwang.gitbook.io/class/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://easonwang.gitbook.io/class/assert-duan-yan.md).

# Assert(斷言)

提供許多測試方法函式，如果表達式不符合就會拋出一個錯誤