Stub Httparty call: Wrong number of arguments (given 2, expected 1) - ruby-on-rails

Question

I created a simple ruby file (not Rails) and I am trying to test (using Rspec) a method where I am calling an API. In the test I am trying to mock the call via WebMock but it keeps giving me this error:
Requests::FilesManager#display fetches the files from the API
Failure/Error: Requests::FilesManager.new.display
ArgumentError:
wrong number of arguments (given 2, expected 1)
The files are:
#run.rb
module Requests
require "httparty"
require 'json'
class FilesManager
include HTTParty
def initialize
end
def display
response = HTTParty.get('https://api.publicapis.org/entries', format: :json)
parsed_response = JSON.parse(response.body)
puts "The secret message was: #{parsed_response["message"]}"
end
end
end
and the spec file:
require 'spec_helper'
require_relative '../run'
RSpec.describe Requests::FilesManager do
describe "#display" do
it 'fetches the files from the API' do
stub_request(:get, "https://api.publicapis.org/entries").
to_return(status: 200, body: "", headers: {})
Requests::FilesManager.new.display
end
end
end
EDIT:
So the error seems to come from the line:
JSON.parse(response.body)
If I comment it out it disappears. The problem then is that the output of the call is not a json (even with the format: :json when calling the HTTParty). I tried other solutions but nothing seems to work in making the response json. It is just a string.

Answer 1

Change
response = HTTParty.get('https://api.publicapis.org/entries', format: :json)
to
response = HTTParty.get('https://api.publicapis.org/entries').
I think you don't need the format: :json more so when you explicitly format the response to JSON anyway.

Answer 2

You need to return a json object in the body parameter of the stubbed response:
E.g: For an empty response:
stub_request(:get, "https://api.publicapis.org/entries").
to_return(status: 200, body: "".to_json, headers: {})
OR For a valid response: (Note: You may have to require json to convert a hash to json)
require 'json'
...
stub_request(:get, "https://api.publicapis.org/entries").
to_return(status: 200, body: { entries: { '0': { message: "Hello World" } } }.to_json, headers: {})

Answer 3

Solved!
It seems there was an error because the json gem version that HTTParty uses is too old.
Moved on to RestClient gem for the RESTful API calls. It had another conflict in the mime gem versioning.
Finally moved to Faraday and that solved my problems:
JSON.parse(response.body, :quirks_mode => true)

Answer 4

tl;dr Had the same issue and ended up having to upgrade webmock.
Long form:
Webmock inserts middleware into your calls, so when HTTParty makes the calls they end up going through the Webmock interfaces first.
You can verify this by trying the call standalone (withouth all the rspec config):
bundle console
irb> require "httparty"
=> true
irb> httparty.get("https://google.com")
If that standalone call succeeds, the issue is somewhere within Webmock itself.
For me, somewhere along the line of calls through Webmock was an outdated interface that was incompatible and throwing the Wrong Number of Arguments error. And this was also crashing my debugger (RubyMine).
Upgrading Webmock solved this issue (because they had fixed it in newer versions).