ruby-on-rails - RSpec:在每个上下文之后刷新表/销毁对象

Question

你如何删除你创建的对象(在数据库和内存中)

• 每次测试后
• AND 在每个上下文之后？ (在某种情况下，相互构建测试可能是有意义的)

是否有自动执行此操作的方法？

我有以下问题:

每个测试都会将条目保存到数据库中。下一个测试则取决于这些条目。即使我想构建依赖于其他测试的测试，我也做不到，因为测试的执行顺序是不可控的。

工厂.rb:

sequence(:name) { |n| "purchaser #{n}" }      

organization_spec.rb:

context "when no supplier exists" do
  it "finds no associated suppliers" do
    purchaser = create(:organization_purchaser)                
    purchaser.partners.empty?.should == true
  end
end

context "when one supplier exists" do
  it "finds one associated suppliers" do
    purchaser = create(:organization_purchaser)      
    supplier = create(:organization_supplier)
    partnership = create(:partnership, organization: purchaser, partner: supplier)         
    purchaser.partners.last.name.should == "purchaser 1"
  end
end

context "when two suppliers exist" do        
  it "finds two associated suppliers" do
    purchaser = create(:organization_purchaser)      
    2.times do |i|
      supplier = create(:organization_supplier)
      partnership = create(:partnership, organization: purchaser, partner: supplier) 
    end    
    purchaser.partners.last.name.should == "purchaser 2"
  end
end

RSpec 输出:

Organization
  #suppliers_for_purchaser
    responds
    when no supplier exists
      finds no associated suppliers
    when two suppliers exist
      finds two associated suppliers
    when one supplier exists
      finds one associated suppliers (FAILED - 1)

Failures:

1) Organization#suppliers_for_purchaser when one supplier exists finds one associated suppliers
 Failure/Error: purchaser.partners.last.name.should == "purchaser 1"
   expected: "purchaser 1"
        got: "purchaser 3" (using ==)

Answer 1

你应该使用 Database Cleaner

您所要做的就是将以下代码添加到您的 Rspec 配置文件 spec_helper.rb

config.before(:suite) do
  DatabaseCleaner.strategy = :transaction
  DatabaseCleaner.clean_with(:truncation)
end

config.before(:each) do
  DatabaseCleaner.start
end

config.after(:each) do
  DatabaseCleaner.clean
end

更新

从 Rails 5.1 开始，如果您使用 config.use_transactional_tests，则不需要这样做

https://github.com/rails/rails/pull/19282