Testing Rails Validations

jlong (John W. Long) — Tue, 17 Jan 2006 20:25:14 GMT


#

# Useful for testing Rails ActiveRecord validations. For more information see:

# http://wiseheartdesign.com/articles/2006/01/16/testing-rails-validations/

#

module ValidationTestHelper

  def assert_valid(field, message, *values)

    __model_check__

    values.each do |value|

      o = __setup_model__(field, value)

      if o.valid?

        assert_block { true }

      else

        messages = [o.errors[field]].flatten

        assert_block("unexpected invalid field <#{o.class}##{field}>, value: <#{value.inspect}>, errors: <#{o.errors[field].inspect}>.") { false }

      end

    end

  end

  

  def assert_invalid(field, message, *values)

    __model_check__

    values.each do |value|

      o = __setup_model__(field, value)

      if o.valid?

        assert_block("field <#{o.class}##{field}> should be invalid for value <#{value.inspect}> with message <#{message.inspect}>") { false }

      else

        messages = [o.errors[field]].flatten

        assert_block("field <#{o.class}##{field}> with value <#{value.inspect}> expected validation error <#{message.inspect}>, but got errors <#{messages.inspect}>") { messages.include?(message) }

      end

    end

  end

  

  def __model_check__

    raise "@model must be assigned in order to use validation assertions" if @model.nil?

    

    o = @model.dup

    raise "@model must be valid before calling a validation assertion, instead @model contained the following errors #{o.errors.instance_variable_get('@errors').inspect}" unless o.valid?

  end

  

  def __setup_model__(field, value)

    o = @model.dup

    attributes = o.instance_variable_get('@attributes')

    o.instance_variable_set('@attributes', attributes.dup)

    o.send("#{field}=", value)

    o

  end

end
DZone Snippets: validations code

Testing Rails Validations
