ruby-on-rails-3 - 如何使用 Rspec 测试载波版本大小

Question

我有一个 CarrierWave::Uploader 可以生成三个版本的上传图像。

# Process files as they are uploaded:                                                                  
   process :resize_to_fit => [400, 400]                                                                   

   # Create different versions of your uploaded files:                                                    
   version :thumb do                                                                                      
     process :resize_to_fit => [60, 60]
   end

   version :small do
     process :resize_to_fit => [24, 24]
   end

在我的测试中，我尝试验证生成图像的尺寸

require 'spec_helper'
require 'carrierwave/test/matchers'

describe 'manufacturer logo uploader' do
  include CarrierWave::Test::Matchers

  before(:each) do
    image_path = Rails.root.join('test/fixtures/images', 'avatar100.gif').to_s
    @manufacturer = Factory.create(:manufacturer, :page_status => 1)
    @manufacturer.logo_image = File.open(image_path)
    @manufacturer.save!
  end

  context "manufacturer logo dimensions" do
    it "should have three versions" do
      @manufacturer.logo_image.should have_dimensions(400,400)
      @manufacturer.logo_image.thumb.should have_dimensions(60,60)
      @manufacturer.logo_image.small.should have_dimensions(24,24)
    end
  end

end

但此测试取决于实际图像，并且 resize_to_fit 不一定会将其调整为指定的尺寸。关于如何使用 stub 测试这个的任何想法？

Answer 1

这是我的解决方案，它实际上处理图像。这比 stub 慢，但会验证实际调整大小(只要输入图像大于目标大小)。

describe 'images' do

  include CarrierWave::Test::Matchers

  before do
    MyUploader.enable_processing = true
  end

  it 'are resized' do
    path = Rails.root.join *%w[ spec data sample.png ]
    my_model = FactoryGirl.create :my_model, image: path.open

    my_model.artwork.small.should be_no_larger_than(300, 400)
  end

  after do
    MyUploader.enable_processing = false
  end

end