test_helper.rb

# C'est très bien, j'ai apporté une simple somplification, inutile d'invoquer #save quand
# l'introspection API te donne #valid?. N'oublions jamais, nous testons nos applications, et *pas* *Rails*.
#
# Par contre Shoulda fait déjà tout ça pour toi, je te montre comment ci-dessous.

# Generate generic tests for instance and unsaved objects
# object as String
# uniqueness_attr as Array
# model_generic_tests("account", %w(name))
def model_generic_tests(object, uniqueness_attr=[])
  context "A #{object} instance" do
    setup do
      @object = Factory(object.to_sym)
    end

    should "return its name" do
      assert @object.name
    end

    uniqueness_attr.each do |attr|
      model_uniqueness_tests(@object, attr)
    end
    
    should "not save #{object} without name" do
      @object.name = nil
###      assert !@object.save
        assert !@object.valid?
    end
  end
  context "A unsaved #{object} instance" do
    setup do
      @object = Factory.build(object.to_sym, :name => nil)
    end

    should "not save #{object} without name" do
###      assert !@object.save
      assert !@object.valid?
    end
  end
end

# Generate uniqueness_tests
# object as String
# attribute as String
# model_uniqueness_tests("account", "name")
def model_uniqueness_tests(object, attribute)
  should "have unique #{attribute}" do
    object = Factory(object.to_sym, attribute.to_sym => "unique")
    object_not_unique = Factory.build(object.to_sym, attribute.to_sym => "unique")

   ###    assert !object_not_unique.save
   assert !object_not_unique.valid?  # il est triste que Shoulda n'implèmente pas assert_invalid :(

   
  end
end

############
###
### Tout ça est déjà implementé par Shoulda :(
###
############
include 'test_helper'
class MyModelTest < ActiveSupport::UnitTest
 
  should_validate_uniqueness_of :name
  should_validate_presence_of :name
  ### http://rdoc.info/rdoc/thoughtbot/shoulda/blob/272aad1c4d5897ff232ec9a75a73c85b0f64554a/Shoulda/ActiveRecord/Macros.html#should_validate_uniqueness_of-instance_method

end