module ValidationExamplesMatcher

# File lib/validation_examples_matcher.rb, line 5
def self.register(matchers = RSpec::Matchers)
  matchers.define :be_valid_on do |attr_name|
    match do |model|
      model.send("#{attr_name}=", @value)
      model.valid?(@context)
    end

    chain :with do |value|
      @value = value
    end

    chain :on_context do |context|
      @context = context
    end

    failure_message do |model|
      "expect #{model.class} to be valid, but it is INVALID."
    end
  end

  matchers.define :be_invalid_on do |attr_name|
    match do |model|
      model.send("#{attr_name}=", @value)
      model.invalid?(@context) && model.errors[attr_name].size >= 1
    end

    chain :with do |value|
      @value = value
    end

    chain :on_context do |context|
      @context = context
    end

    failure_message do |model|
      if model.valid?(@context)
        "expect #{model.class} to be invalid, but it is VALID."
      else
        "expect #{model.class} to have errors on #{attr_name}, but EMPTY."
      end
    end
  end
end