遇到问题

我练习测试一个字段为整数时，遇到如下问题，不知道是哪的原因！
1) Failure:
test_integer_field(ItouchServiceTest)
    [test/unit/itouch_service_test.rb:32:in `test_integer_field'
     c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.1/lib/active_support/testi
ng/default.rb:7:in `run']:
<"鐣欒█娆℃暟蹇呴』涓烘暣鏁帮紒"> expected but was
<nil>.

1 tests, 2 assertions, 1 failures, 0 errors
急用！