RSpec matcher for validates_with

validate_with_matcher.rb

# RSpec matcher for validates_with.
# https://gist.github.com/2032846
# Usage:
#
#     describe User do
#       it { should validate_with CustomValidator }
#     end

RSpec::Matchers.define :validate_with do |validator|
  match do |subject|    
    subject.class.validators.map(&:class).include? validator
  end
  
  description do
    "RSpec matcher for validates_with"
  end

  failure_message_for_should do |text|
    "expected to validate with #{validator}"
  end

  failure_message_for_should_not do |text|
    "do not expected to validate with #{validator}"
  end
end

changed deprecated methods and added chaining for options hash https://gist.github.com/Bartuz/98abc9301adbc883b510

it { is_expected.to validate_with(MyValidator).with_options(on: :admin) }

Just FYI, I've included this in my personal gem of spec helpers ... https://github.com/schrodingersbox/spec_cat#credits ... please open an issue if you object or would like any changes to the attribution.

And thanks!