thing_spec.rb

require "net/http"
require "json"
require "rspec/autorun"

module Thing
  def self.thing(response)
    case response
    when Net::HTTPSuccess
      :ok
    when Net::HTTPNotFound
      :Nope
    else
      :fail
    end
  end
end

RSpec.describe "thing" do
  subject { Thing.thing(response) }
  
  context "with success" do
    let(:response) { Net::HTTPSuccess.new("1.1", "200", "OK") }
    before { allow(response).to receive(:body).and_return({status: :stuff}.to_json) }

    it "does a thing" do
      expect(subject).to eq(:ok)
    end
  end

  context "with Nope" do
    let(:response) { Net::HTTPNotFound.new("1.1", "404", "Not Found") }

    it "errors" do
      expect(subject).to eq(:Nope)
    end
  end

  context "with fail" do
    let(:response) { Net::HTTPServiceUnavailable.new("1.1", "503", "Service Unavailable") }

    it "errors" do
      expect(subject).to eq(:fail)
    end
  end
end
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