specify posix.pwd:
- before:
    pwd = require "posix.pwd"


- describe endpwent:
  - before:
      endpwent = pwd.endpwent

  - context with bad arguments:
      badargs.diagnose (endpwent, "()")

  - it returns 'nil':
      expect (endpwent ()).to_be (nil)
  - it rewinds the passwd database:
      p = pwd.getpwent ()
      pwd.getpwent ()
      endpwent ()
      expect (pwd.getpwent ()).to_equal (p)


- describe getpwent:
  - before:
      getpwent = pwd.getpwent

  - context with bad arguments:
      badargs.diagnose (getpwent, "()")

  - it returns a PosixPasswd for an existing user:
      expect (prototype (getpwent ())).to_be "PosixPasswd"
  - it fetches a different user on subsequent calls:
      p = getpwent ()
      expect (getpwent ()).not_to_equal (p)
  - it returns nil after the last entry was fetched:
      p = getpwent ()
      while (p) do
        q = getpwent ()
        expect (p).not_to_equal (q)
        p = q
      end
      expect (p).to_be (nil)
      pwd.endpwent ()


- describe getpwnam:
  - before:
      getpwuid, getpwnam = posix.getpwuid, posix.getpwnam

  - context with bad arguments:
      badargs.diagnose (getpwnam, "(string)")

  - it returns 'nil' for a non-existent user:
      expect (getpwnam "veryunlikelyusername").to_be (nil)
  - it returns a PosixPasswd for an existing user:
      expect (prototype (getpwnam "root")).to_be "PosixPasswd"
  - it fetches a passwd entry by name:
      expect (getpwnam ("root").pw_name).to_be "root"
      expect (getpwnam ("root").pw_uid).to_be (0)
      expect (getpwnam ("root").pw_gid).to_be (0)
      expect (type (getpwnam ("root").pw_dir)).to_be "string"
      expect (type (getpwnam ("root").pw_shell)).to_be "string"


- describe getpwuid:
  - before:
      getpwuid = posix.getpwuid

  - context with bad arguments:
      badargs.diagnose (getpwuid, "(int)")

  - it returns a PosixPasswd for an existing user:
      expect (prototype (getpwuid (0))).to_be "PosixPasswd"
  - it fetches a passwd entry by gid:
      expect (getpwuid (0).pw_name).to_be "root"
      expect (getpwuid (0).pw_uid).to_be (0)
      expect (getpwuid (0).pw_gid).to_be (0)
      expect (type (getpwuid (0).pw_dir)).to_be "string"
      expect (type (getpwuid (0).pw_shell)).to_be "string"


- describe setpwent:
  - before:
      setpwent = pwd.setpwent

  - context with bad arguments:
      badargs.diagnose (setpwent, "()")

  - it returns 'nil':
      expect (setpwent ()).to_be (nil)
  - it rewinds the passwd database:
      p = pwd.getpwent ()
      pwd.getpwent ()
      setpwent ()
      expect (pwd.getpwent ()).to_equal (p)