Undefined method `assert_select'?

Rails
1

HI all,

I just upgraded my Rail app and the assert_select method still doesnt
work in my controller tests.
I keep getting:

  1. Error:
    test_login_with_invalid_user(AdminControllerTest):
    NoMethodError: undefined method `assert_select’ for
    #AdminControllerTest:0x2460ef8
    method method_missing in test_process.rb at line 432
    method test_login_with_invalid_user in admin_controller_test.rb at
    line 19

anyone encoutered this problem?