module Shoulda::Matchers::ActiveModel

with_message(/is not optional/) }
it { should validate_presence_of(:name).
it { should validate_presence_of(:name) }
Examples:

Defaults to the translation for :blank.
errors.on(:attribute). Regexp or String.
* with_message - value the test expects to find in
Options:

present.
Ensures that the model is not valid if the given attribute is not

def validate_presence_of(attr)
  ValidatePresenceOfMatcher.new(attr)
end