7.3 Playtime 7.1 Iteration B1: Validation and Unit Testing
Introduce the importance of unit testing.
Look at what files are generated
ls test/unit
helpers
product_test.rb
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
Look at existing test data
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
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
Tests pass!
rake test:units
Loaded suite /home/rubys/.rvm/gems/ruby-1.8.7-p352/gems/rake-0.9.2.2/lib/rake/rake_test_loader
Started
.....
Finished in 0.433211 seconds.
5 tests, 23 assertions, 0 failures, 0 errors