a situation in which everything happens as it is supposed to, with no faults

The happy path is meant to describe the ideal process, without any exceptions or alternate paths. “幸福之路”指的是一种理想过程，没有任何例外或替代路径。

The happy path for getting into the system would be that the user already has an account, knows their credentials, enters them correctly, the system authenticates the user, and they can access the system. 进入系统的“幸福之路”是：用户已经拥有帐户，知道自己的密码，密码输入正确，系统对用户进行身份验证，然后用户就可以进入系统。