```
# /usr/obj/home/yuri/ws/pw/amd64.amd64/usr.sbin/pw/pw useradd -D -w no; grep defaultpasswd /etc/pw.conf
defaultpasswd = "no"
# /usr/obj/home/yuri/ws/pw/amd64.amd64/usr.sbin/pw/pw useradd -D -w none; grep defaultpasswd /etc/pw.conf
defaultpasswd = "none"
# /usr/obj/home/yuri/ws/pw/amd64.amd64/usr.sbin/pw/pw useradd -D -w random; grep defaultpasswd /etc/pw.conf
defaultpasswd = "random"
# /usr/obj/home/yuri/ws/pw/amd64.amd64/usr.sbin/pw/pw useradd -D -w yes; grep defaultpasswd /etc/pw.conf
defaultpasswd = "yes"
# /usr/obj/home/yuri/ws/pw/amd64.amd64/usr.sbin/pw/pw useradd -D -w whoa; grep defaultpasswd /etc/pw.conf
pw: Invalid value for default password
defaultpasswd = "yes"
```
Also, newly added test cases:
```
...
usr.sbin/pw/pw_useradd_test:user_add_conf_defaultpasswd -> passed [0.089s]
...
```