TestInjector plugin

Copyright 2006 Keith Morrison <keithm@infused.org>

SVN

http://www.infused.org/svn/plugins/test_injector

Tests performed

The automatically injected tests are currently limited to tests against ActiveRecord models. However, there is nothing stopping you from adding tests for other portions of the framework.

ActiveRecord tests

Every association defined in the ActiveRecord model. A common model might look like:

class User < ActiveRecord::Base
has_and_belongs_to_many :groups
belongs_to :company
has_many :purchases, :class_name => “Order”, :dependent => :nullify
has_many :subscriptions, :dependent => :destroy
has_many :newspapers, :through => subscriptions
end

By calling inject_activerecord_tests some here in the class definition, several test will be injected into the unit test at runtime.

class UserTest < Test::Unit::TestCase
fixtures :groups, :companies, :orders, :subscriptions, :newspapers
inject_activerecord_tests
end

Based on the example User class, the following tests will be run (notice that we didn’t have to define any test methods in the test class):

def test_has_and_belongs_to_many_groups
# asserts that groups is an Array of Groups
end

def test_belongs_to_company
# asserts that company return an instance of Company
end

def test_has_many_purchases
# asserts that purchases is an Array of Purchases
# asserts that associated purchases’s user_id column is
# nullified when the user is deleted
end

def test_has_many_subscriptions
# asserts that subscriptions is an array of Subscriptions
# asserts that all subscriptions are destroyed when a User is deleted
end

def test_has_many_newspapers_through_subscriptions
# asserts that newspapers is an array of Newspapers
end

def test_fixture_defined_for_companies
# tests to see if a fixture called ‘companies’ is defined in the unit test
end

def test_fixture_defined_for_purchases
# tests to see if a fixture called ‘orders’ is defined in the unit test
end

def test_fixture_defined_for_subscriptions
# tests to see if a fixture called ‘subscriptions’ is defined in the unit test
end

def test_fixture_defined_for_newspapers
# tests to see if a fixture called ‘newspapers’ is defined in the unit test
end

If the users table has a ‘lock_version’ column, one test will be defined
def test_optimistic_locking
# forces a StaleObjectError in order to test that optimisic locking is functioning correctly
end

If the users table is using the acts_as_versioned plugin by technoweenie, one test will be defined
def test_acts_as_versioned
# tests that the versioned table is set up correctly by exercising the versioning system
end

h2. To do

• Better tests on polymorphic associations
• Test standard validations

—-

test_has_(and_belongs_to_)many_X assumes that the association can’t be NULL; test_belongs_to_Y assumes that the set of associated objects is never empty. Unfortunately, these assumptions are not generally valid. —MichaelSchuerig