How make stub on request with VCR? - ruby-on-rails

Question

How can I do stub on request with VCR?
The problem is that real request is made in the test, which I want to stub.
RSpec.describe CreditRegisterLoader do
describe ".call" do
it "should create credit institutions", :vcr do
Timecop.freeze(2020, 3, 25, 13, 0, 0) do
expect { described_class.new.call }.to change { CreditInstitution.count }.by(4965)
end
end
end
end
Also here is code of my class CreditRegisterLoader which I want to test:
class CreditRegisterLoader < ApplicationService
def initialize
#timestamp = (Time.now - 1.minute).to_i.to_s
end
def call
sai_response = get_credit_institutions
unless sai_response
Airbrake.notify("invalid_sai_response")
return
end
begin
CreditInstitutionUpdater.new(JSON.parse(sai_response.body)).create
rescue => error
Airbrake.notify(error)
end
end
private
def get_credit_institutions
RestClient::Request.execute(
method: :post,
url: "https://sai.dpl.europa.eu/register/api/search/entities?t=#{#timestamp}",
headers: {
"Content-Type" => "application/json",
"Accept" => "application/json",
},
payload: JSON.generate({"$and": [{"_messagetype": "SAIDPL"}]})
)
end
end

Answer 1

I would suggest the following solution
RSpec.describe CreditRegisterLoader do
describe ".call" do
let(:response) { OpenStruct.new(body: File.read("yours fixtures in json format")) }
context "Failure flow" do
it "should notify Airbrake with error" do
error = StandardError.new("Bad Request")
expect(RestClient::Request).to receive(:execute).and_return(response)
expect_any_instance_of(CreditInstitutionUpdater).to receive(:create).and_raise(error)
expect(Airbrake).to receive(:notify).with(error)
subject.call
end
it "should notify Airbrake with invalid_sai_response" do
expect(subject).to receive(:get_credit_institutions).and_return(nil)
expect(Airbrake).to receive(:notify).with("invalid_sai_response")
subject.call
end
end
context "Successfully flow" do
it "should creates credit institutions" do
expect(RestClient::Request).to receive(:execute).and_return(response)
expect { subject.call }.to change { CreditInstitution.count }.by(2)
fixtures_response = JSON.parse(response.body)
end
end
end
end