Unexpected passing spec with validate_inclusion_of

[ericindc]

I have the following in one of my specs and it passes without having
ever added the corresponding validate_inclusion_of in my model. Am I
doing something wrong? Or why is this passing? I see it specifically
say "should ensure inclusion of captcha in 14". Thanks.

it { should validate_inclusion_of(:captcha, :in =>
[Date.today.day], :message => /You must provide the correct spam check
response$/)}