ruby-on-rails - 如何在 RSpec 中多次说 "any_instance" "should_receive"

Question

我在 Rails 中有一个导入 Controller ，可以将多个包含多条记录的 csv 文件导入我的数据库。我想在 RSpec 中测试记录是否实际上是通过使用 RSpec 保存的:

<Model>.any_instance.should_receive(:save).at_least(:once)

但是我收到错误消息:

The message 'save' was received by <model instance> but has already been received by <another model instance>

Controller 的人为示例:

rows = CSV.parse(uploaded_file.tempfile, col_sep: "|")

  ActiveRecord::Base.transaction do
    rows.each do |row| 
    mutation = Mutation.new
    row.each_with_index do |value, index| 
      Mutation.send("#{attribute_order[index]}=", value)
    end
  mutation.save          
end

是否可以使用 RSpec 对此进行测试，或者是否有任何解决方法？

Answer 1

这是一个更好的答案，可以避免重写 :new 方法:

save_count = 0
<Model>.any_instance.stub(:save) do |arg|
    # The evaluation context is the rspec group instance,
    # arg are the arguments to the function. I can't see a
    # way to get the actual <Model> instance :(
    save_count+=1
end
.... run the test here ...
save_count.should > 0

似乎 stub 方法可以附加到任何没有约束的实例，并且 do block 可以进行计数，您可以检查该计数以断言它被调用了正确的次数。

更新 - 新的 rspec 版本需要这个语法:

save_count = 0
allow_any_instance_of(Model).to receive(:save) do |arg|
    # The evaluation context is the rspec group instance,
    # arg are the arguments to the function. I can't see a
    # way to get the actual <Model> instance :(
    save_count+=1
end
.... run the test here ...
save_count.should > 0