RSpec - uninitialized constant for instance double - api

Question

I am getting a name error for a small API i am building with RSpec, using TDD methodology
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
Below is the error that i am getting :
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)>'
Am I missing something? i have tried to play around with passing the ledger: Ledger.new to app = API.new but not getting past this error.
any help or ideas would be great !

Answer 1

Ok figured this one out, after a lot of head banging on the desk.
I had to comment out the app = API.new as this is not yet implemented, every time i would load the file in the spec it would error me out.
# Later, callers do this ledger: Ledger.new
app = API.new()
now on to the next failing spec lol !