ruby-on-rails - Rspec 不能 stub where 或 find_by_，只能找到

Question

我将分享几对运行代码和测试代码。基本上，测试代码仅在我使用 find 时才有效。在对象类上，但问题是 find是我不想使用的一种方法，因为我不是在寻找主键!

方法一 : stub :where与 Plan.all这样就可以调用 first

#run code
@current_plan = Plan.where(stripe_subscription_id: event.data.object.lines.data.first.id).first

#test code
@plan = Plan.new #so this is the first Plan that I'd like to find
Plan.stub(:where).and_return(Plan.all)

#result of @current_plan (expecting @plan)
=> nil

方法二 : 链桩 :where和 :first

#run code
@current_plan = Plan.where(stripe_subscription_id: event.data.object.lines.data.first.id).first

#test code
@plan = Plan.new #so this is the first Plan that I'd like to find
Plan.stub_chain(:where, :first).and_return(@plan)

#result of @current_plan (expecting @plan)
=> nil

方法三 : stub 定制 :find_by

#run code
@current_plan = Plan.find_by_stripe_subscription_id(event.data.object.lines.data.first.id)

#test code
@plan = Plan.new
Plan.stub(:find_by_stripe_subscription_id).and_return(@plan)

#result of @current_plan (expecting @plan)
=> nil

方法四 : stub :find作品!但是我无法通过主键找到...所以我理想情况下需要方法 3 才能工作...

#run code
@current_plan = Plan.find(2) #for giggles, to make sure the stub is ignoring the 2 argument

#test code
@plan = Plan.new
Plan.stub(:find).and_return(@plan)

#result of @current_plan (expecting @plan)
=> @plan

我想另一个答案是我如何创造性地使用 :find有争论，即使我明白这不是最佳实践......

Answer 1

您可以 stub 这些方法。所有这些测试都通过了:

require 'rails_helper'

RSpec.describe Foo, type: :model do
  let(:foo) { double(name: "foo") }

  it "works with find" do
    expect(Foo).to receive(:find).and_return(foo)
    expect(Foo.find(1)).to eq foo
   end

  it "works with find_by" do
    expect(Foo).to receive(:find_by_name).and_return(foo)
    expect(Foo.find_by_name("foo")).to eq foo
  end

  it "works with where" do
    expect(Foo).to receive(:where).and_return([ foo ])
    expect(Foo.where(name: "foo")).to eq [foo]
  end
end