How to stub HTTP POST request in rspec?

Question

I have a controller which contains a method and some conditional statements. the following is a sample of that controller.

class <controllername> < ApplicationController
def method
  if params["c"]
   http = Net::HTTP.new(uri.host, uri.port)
   req = Net::HTTP::Post.new("api_url_here")
   response = http.request(req)
   array = JSON.parse(response.body)
   url = params["s"]
   .....
  elsif params["e"]
   .....
  else
   .....
  end
end
end

I wrote rspec for the above controller

it "should do something" do
   array ="some array values"
   get :method, {"c" => "value for c", "s" => "value for s"}
   expect(response).to have_http_status(200)
end

I know the above rspec method is completely wrong. when this case runs the value for array and response are obtained by post call inside method and the response is HTTPBADREQUEST as expected.

What I want is

To stub those values for array and response in the spec case(these values will be needed for later operations) and my spec case to not call HTTP::POST inside the method

medium.com/finc-engineering/… seems like a good place to start? — CyberMew

rorra rorra · Accepted Answer · 2015-04-23T07:03:33

you can mock the answer

expect_any_instance_of(Net::HTTP::Post).to receive(:request) { response_data_here }

You can also use VCR: https://github.com/vcr/vcr

When you run VCR for the first time, it will do the real request and save the response as a fixture, the second time it will use the fixture and avoid the real http request

How to stub HTTP POST request in rspec?

3 Answers