RSpec

Question

我正在使用 RSpec 使用 TDD 方法

构建的小型 API 出现名称错误

NameError:
  uninitialized constant ExpenseTracker::API::Ledger

API.rb

require "sinatra/base"
require "json"

module ExpenseTracker
  class API < Sinatra::Base

def initialize(ledger: Ledger.new) # default value so callers can just say API.new and get the default
  @ledger = ledger
  super() # rest of initialization from Sinatra
end

# Later, callers do this ledger: Ledger.new
app = API.new()

post '/expenses' do
  JSON.generate('expense_id' => 42)
end

get '/expenses/:date' do
  JSON.generate([])
end
end
end

api_spec.rb

require_relative "../../../app/api"
require "rack/test"

module ExpenseTracker

RecordResult = Struct.new(:success?, :expense_id, :error_message)

RSpec.describe API do
include Rack::Test::Methods

def app
  API.new(ledger: ledger)
end

let(:ledger) { instance_double('ExpenseTracker::Ledger') }

describe "POST /expense" do
  context "when the expenseis successfully recorded" do
    it 'returns the expense id'do
      allow(ledger).to receive(:record)
      .with(expense)
      .and_return(RecordResult.new(true, 417, nil))

    post '/expense', JSON.generate(expense)

    parsed = JSON.parse(last_response.body)
    expect(parsed).to include('expense_id': 417)
    end
    it 'responds with a 200 (OK)'
  end

  context "when the expense fails validation" do
    it 'returns an error message'
    it 'responds with 422 (Unprocessable entity)'
  end

end
end
end

以下是我遇到的错误：

An error occurred while loading ./api_spec.rb.
Failure/Error:
  def initialize(ledger: Ledger.new) # default value so callers can just say API.new and get the default
    @ledger = ledger
    super() # rest of initialization from Sinatra
  end

NameError:
  uninitialized constant ExpenseTracker::API::Ledger

/Users/Denis/Desktop/TDD/Effective_Testing_with_Rspec3/04-acceptance-specs/expense_tracker/app/api.rb:7:in `initialize'
/Users/Denis/Desktop/TDD/Effective_Testing_with_Rspec3/04-acceptance-specs/expense_tracker/app/api.rb:13:in `<class:API>'
/Users/Denis/Desktop/TDD/Effective_Testing_with_Rspec3/04-acceptance-specs/expense_tracker/app/api.rb:5:in `<module:ExpenseTracker>'
/Users/Denis/Desktop/TDD/Effective_Testing_with_Rspec3/04-acceptance-specs/expense_tracker/app/api.rb:4:in `<top (required)>'
./api_spec.rb:1:in `require_relative'
./api_spec.rb:1:in `<top (required)>'

我错过了什么吗？我试图尝试将分类帐：Ledger.new 传递给 app = API.new 但没有克服这个错误。

任何帮助或想法都会很棒！

Answer 1

好的，在用头敲打桌子很多次之后，我想通了。

我不得不注释掉 app = API.new 因为这还没有实现，每次我加载规范中的文件时都会出错。

# Later, callers do this ledger: Ledger.new
app = API.new()

现在进入下一个失败的规格大声笑！

RSpec - 未初始化常量，例如 double

RSpec - uninitialized constant for instance double

api

bdd

sinatra

nameerror