Lección 05 del curso de TDD en Ruby on Rails: Shoulda

1. CURSO DE TESTING OSL
12 – 16 DE ABRIL 2010
Shoulda
Alberto Perdomo
Web: http://albertoperdomo.net
Email: alberto.perdomo@aentos.es
Twitter: @albertoperdomo http://www.aentos.com

2. TEST::UNIT
→ los tests no tienen mucha expresividad
→ las posibilidades son limitadas
→ acabamos probando las mismas cosas una y otra vez

3. SHOULDA
→ librería que “amplía” Test::Unit
→ helpers para contexto y expresividad
→ macros
→ helpers

4. SHOULDA: CONTEXTO Y
EXPRESIVIDAD
class UserTest < Test::Unit::TestCase
context "A User instance" do
setup do
@user = User.find(:first)
end
should "return its full name" do
assert_equal 'John Doe', @user.full_name
end
context "with a profile" do
setup do
@user.profile = Profile.find(:first)
end
should "return true when sent #has_profile?" do
assert @user.has_profile?
end
end
end
end
Produce los siguientes tests unitarios:
"test: A User instance should return its full name."
"test: A User instance with a profle should return true when sent #has_profle?."

5. SHOULDA: MACROS PARA
ACTIVERECORD
class PostTest < Test::Unit::TestCase
fixtures :all
should_belong_to :user
should_have_many :tags, :through => :taggings
should_validate_uniqueness_of :title
should_validate_presence_of :body, :message => /wtf/
should_validate_presence_of :title
should_validate_numericality_of :user_id
end
class UserTest < Test::Unit::TestCase
should_have_many :posts
should_not_allow_values_for :email, "blah", "b lah"
should_allow_values_for :email, "a@b.com", "asdf@asdf.com"
should_ensure_length_in_range :email, 1..100
should_ensure_value_in_range :age, 1..100
should_not_allow_mass_assignment_of :password
end

6. MACROS PARA ACTIVERECORD
test "a transfer without a from_account should not be valid" do
transfer = Transfer.new(:from_account => nil, :to_account => @account_b, :amount => 100)
assert !transfer.valid?
end
should_validate_presence_of :from_account

7. SHOULDA: MACROS PARA
CONTROLADORES
class PostsControllerTest < ActionController::TestCase
context "on GET to :show for first record" do
setup do
get :show, :id => 1
end
should_assign_to :user
should_respond_with :success
should_render_template :show
should_not_set_the_flash
should "do something else really cool" do
assert_equal 1, assigns(:user).id
end
end
end

8. SHOULDA: ASSERTIONS
assert_same_elements([:a, :b, :c], [:c, :a, :b])
assert_contains(['a', '1'], /d/)
assert_contains(['a', '1'], 'a')

9. ¿PREGUNTAS?