Question

我目前正在通过Agile Development With Rails第4版（Rails 3.2+）。我正在尝试为“产品”模型进行单元测试：

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
end

这是一本又一个字，这本书有什么，并没有其他说明的勘误。我跑的时候：

rake test:units

我回过头来看：

Run options: 

# Running tests:

F

Finished tests in 0.079901s, 12.5155 tests/s, 25.0310 assertions/s.

  1) Failure:
test_product_attributes_must_not_be_empty(ProductTest) [/Users/robertquinn/rails_work/depot/test/unit/product_test.rb:7]:
Failed assertion, no message given.

1 tests, 2 assertions, 1 failures, 0 errors, 0 skips
rake aborted!
Command failed with status (1): [/Users/robertquinn/.rvm/rubies/ruby-1.9.3-...]

Tasks: TOP => test:units
(See full trace by running task with --trace)
Robert-Quinns-MacBook-Pro:depot robertquinn$

以下是我的产品型号验证：

class Product < ActiveRecord::Base
  attr_accessible :description, :image_url, :price, :title

  validates :description, :image_url, :price, presence: true
  validates :price, numericality: {greater_than_or_equal_to: 0.01}
  validates :title, uniqueness: true
  validates :image_url, allow_blank: true, format: {
    with: %r{\.(gif|jpg|png)$}i,
    message: 'must be a URL for GIF, JPG or PNG image.'
    }
end

我无法弄清楚为什么这个耙子被中止了。测试创建了一个空的“Product”对象，因此无效，并且每个属性都应该有错误。然而，看起来rake在击中“：title”属性的第一个断言时中止。我在这里绝对无能为力。任何和所有输入将不胜感激。

Answer 1

通过仅验证标题的唯一性，您仍然允许标题为nil，这会使您的测试失败。您需要将验证更改为

validates :title, presence: true, uniqueness: true

我还建议您在断言中添加消息。这使得更容易看出哪个断言失败：

require 'test_helper'

class ProductTest < ActiveSupport::TestCase
   test "product attributes must not be empty" do
    product = Product.new
    assert product.invalid?, "Empty product passed validation"
    assert product.errors[:title].any?, "Missing title passed validation"
    assert product.errors[:description].any?, "Missing description passed validation"
    assert product.errors[:price].any?, "Missing price passed validation"
    assert product.errors[:image_url].any?, "Missing image URL passed validation"
  end
end

耙子测试：单位流产但为什么？

1 个答案: