# File test/test_passwd.rb, line 44
    def test_empty_user
      assert_exception(RuntimeError) {
        @passwd.add_user(nil, 'foo')
      }
      assert_exception(RuntimeError) {
        @passwd.add_user('', 'foo')
      }
      assert_exception(RuntimeError) {
        @passwd.add_user(' ', 'foo')
      }

      assert_exception(RuntimeError) {
        @passwd.add_encrypted_user(nil, 'foo')
      }
      assert_exception(RuntimeError) {
        @passwd.add_encrypted_user('', 'foo')
      }
      assert_exception(RuntimeError) {
        @passwd.add_encrypted_user(' ', 'foo')
      }
    end