Rails 4 using validations on DateTime to get shoulda test passing

Question

Of the following tests:

  it { should have_valid(:date_time).when ("2014/April/15") }
  it { should_not have_valid(:date_time).when ("2014/April/15000") }
  it { should_not have_valid(:date_time).when ("2014/ZZZ/14") }
  it { should_not have_valid(:date_time).when(nil, '') }

the following two are not passing:

  it { should_not have_valid(:date_time).when ("2014/April/15000") }
  it { should_not have_valid(:date_time).when ("2014/ZZZ/14") }

I'm getting the error message argument out of range for both. In my model, I have the following:

class Textmessage < ActiveRecord::Base

  validates :date_time, presence: true
end

What would I need to add to my validations to get this to pass?

Answer 1

This is the expected behavior from shoulda. Rails will raise an exception when given either of those strings for a DateTime column, not set an error on the model.