7.3 Playtime 7.1 Iteration B1: Validate!
Introduce the importance of unit testing.
Look at what files are generated
ls test/unit
helpers
product_test.rb
Add a fixture.
edit test/fixtures/products.yml
# Read about fixtures at http://ar.rubyonrails.org/classes/Fixtures.html
one:
title: MyString
description: MyText
image_url: MyString
price: 9.99
two:
title: MyString
description: MyText
image_url: MyString
price: 9.99
ruby:
title: Programming Ruby 1.9
description:
Ruby is the fastest growing and most exciting dynamic
language out there. If you need to get working programs
delivered fast, you should add Ruby to your toolbox.
price: 49.50
image_url: ruby.png
Now run the tests... and watch them fail :-(
rake test
(in /home/rubys/svn/rails4/Book/util/work-193/depot)
Loaded suite /home/rubys/.rvm/gems/ruby-1.9.3-r28190%global/gems/rake-0.8.7/lib/rake/rake_test_loader
Started
.
Finished in 0.053996 seconds.
1 tests, 1 assertions, 0 failures, 0 errors, 0 skips
Test run options: --seed 2490
Loaded suite /home/rubys/.rvm/gems/ruby-1.9.3-r28190%global/gems/rake-0.8.7/lib/rake/rake_test_loader
Started
F.....F
Finished in 0.303124 seconds.
1) Failure:
test_should_create_product(ProductsControllerTest) [test/functional/products_controller_test.rb:20]:
"Product.count" didn't change by 1.
<4> expected but was
<3>.
2) Failure:
test_should_update_product(ProductsControllerTest) [test/functional/products_controller_test.rb:39]:
Expected response to be a <:redirect>, but was <200>.
Expected block to return true value.
7 tests, 9 assertions, 2 failures, 0 errors, 0 skips
Test run options: --seed 21440
Errors running test:functionals!
Solution is simple, provide valid data.
edit test/functional/products_controller_test.rb
require 'test_helper'
class ProductsControllerTest < ActionController::TestCase
# ...
setup do
@product = products(:one)
@update = {
:title => 'Lorem Ipsum',
:description => 'Wibbles are fun!',
:image_url => 'lorem.jpg',
:price => 19.95
}
end
test "should get index" do
get :index
assert_response :success
assert_not_nil assigns(:products)
end
test "should get new" do
get :new
assert_response :success
end
test "should create product" do
assert_difference('Product.count') do
post :create, :product => @update
end
assert_redirected_to product_path(assigns(:product))
end
test "should update product" do
put :update, :id => @product.to_param, :product => @update
assert_redirected_to product_path(assigns(:product))
end
end
Tests now pass again :-)
rake test
(in /home/rubys/svn/rails4/Book/util/work-193/depot)
Loaded suite /home/rubys/.rvm/gems/ruby-1.9.3-r28190%global/gems/rake-0.8.7/lib/rake/rake_test_loader
Started
.
Finished in 0.053070 seconds.
1 tests, 1 assertions, 0 failures, 0 errors, 0 skips
Test run options: --seed 56788
Loaded suite /home/rubys/.rvm/gems/ruby-1.9.3-r28190%global/gems/rake-0.8.7/lib/rake/rake_test_loader
Started
.......
Finished in 0.258406 seconds.
7 tests, 10 assertions, 0 failures, 0 errors, 0 skips
Test run options: --seed 54616
Add some unit tests for new function.
edit test/unit/product_test.rb
require 'test_helper'
class ProductTest < ActiveSupport::TestCase
test "product attributes must not be empty" do
product = Product.new
assert product.invalid?
assert product.errors[:title].any?
assert product.errors[:description].any?
assert product.errors[:price].any?
assert product.errors[:image_url].any?
end
test "product price must be positive" do
product = Product.new(:title => "My Book Title",
:description => "yyy",
:image_url => "zzz.jpg")
product.price = -1
assert product.invalid?
assert_equal "must be greater than or equal to 0.01",
product.errors[:price].join('; ')
product.price = 0
assert product.invalid?
assert_equal "must be greater than or equal to 0.01",
product.errors[:price].join('; ')
product.price = 1
assert product.valid?
end
def new_product(image_url)
Product.new(:title => "My Book Title",
:description => "yyy",
:price => 1,
:image_url => image_url)
end
test "image url" do
ok = %w{ fred.gif fred.jpg fred.png FRED.JPG FRED.Jpg
http://a.b.c/x/y/z/fred.gif }
bad = %w{ fred.doc fred.gif/more fred.gif.more }
ok.each do |name|
assert new_product(name).valid?, "#{name} shouldn't be invalid"
end
bad.each do |name|
assert new_product(name).invalid?, "#{name} shouldn't be valid"
end
end
test "product is not valid without a unique title" do
product = Product.new(:title => products(:ruby).title,
:description => "yyy",
:price => 1,
:image_url => "fred.gif")
assert !product.save
assert_equal "has already been taken", product.errors[:title].join('; ')
end
test "product is not valid without a unique title - i18n" do
product = Product.new(:title => products(:ruby).title,
:description => "yyy",
:price => 1,
:image_url => "fred.gif")
assert !product.save
assert_equal I18n.translate('activerecord.errors.messages.taken'),
product.errors[:title].join('; ')
end
end
Tests pass!
rake test:units
(in /home/rubys/svn/rails4/Book/util/work-193/depot)
Loaded suite /home/rubys/.rvm/gems/ruby-1.9.3-r28190%global/gems/rake-0.8.7/lib/rake/rake_test_loader
Started
.....
Finished in 0.181190 seconds.
5 tests, 23 assertions, 0 failures, 0 errors, 0 skips
Test run options: --seed 65407