Modelizer

• github.com/jbarnette/modelizer

Description

Need a simple, consistent way to create model instances and check validations in your Rails tests? Use the Modelizer.

Examples

First, enable the Modelizer. I do it in test/test_helper.rb:

class ActiveSupport::TestCase
  include Modelizer
end

Next, define a model template. I generally do this in the unit test for the model until I need to use the template somewhere else. As soon as it’s used in multiple places, I move it to a reopened ActiveSupport::TestCase in test/test_helper.rb.

class UserTest < ActiveSupport::TestCase

  # a simple list of attributes
  model_template_for User, :name => "Bob"

  # or a block for lazy evaluation
  model_template_for User do
    { :name => "Bob", :address => addresses(:default) }
  end

end

This declaration generates a bunch of instance methods for you:

• def valid_user_attributes(extras = {})

• def valid_user_attributes_without(*excluded)

• def new_user(extras = {})

• def new_user_without(*excluded)

• def create_user(extras = {})

• def create_user!(extras = {})

• def create_user_without(*excluded)

• def create_user_without!(*excluded)

It also generates a test to make sure your model template is valid.

Custom Assertions

Modelizer adds one additional assertion, assert_invalid.

assert_invalid :email, model, /is bad/

The third argument is optional.

Using in Tests

class UserTest < ActiveSupport::TestCase
  model_template_for User, :name => "Bob"

  def test_pointless_stuff
    assert new_user.valid?
    assert_invalid :name, new_user_without(:name)

    assert !create_user.new_record?

    assert_raise do
      create_user_without! :name
    end

    assert_equal "Fred", new_user(:name => "Fred").name
  end
end

Installation

$ gem install modelizer

License

Copyright 2009-10 John Barnette (code@jbarnette.com)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the ‘Software’), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED ‘AS IS’, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.