pokemon.trade/spec/services/create_pokemon_from_base64_service_spec.rb

# frozen_string_literal: true

require 'rails_helper'

RSpec.describe CreatePokemonFromBase64Service, type: :service do
  describe '#execute' do
    subject(:execute) { service.execute(encoded_pokemon) }

    let(:service) { described_class.new }
    let(:encoded_pokemon) { '1234567890abcdef' }
    let(:client_response) { double(pokemon: [pokemon]) }
    let(:pokemon) do
      pkmn = {pokedex_number: 10, nickname: 'pyukuchu'}
      double(**pkmn, to_h: pkmn)
    end

    before do
      allow_any_instance_of(PKParse::Client).to(
        receive(:parse_base64).and_return(client_response),
      )

      allow(service).to receive(:success)
      allow(service).to receive(:error)
    end

    context 'when parsing succeeds' do
      context 'when committing result to database fails' do
        before do
          allow(Pokemon)
            .to receive(:create!).and_raise(ActiveRecord::ActiveRecordError.new)
        end

        it 'does not create any new pokemon' do
          # expect{execute}.to raise_error 'canned failure'
          expect { (execute rescue nil) }.to change(Pokemon, :count).by(0)
        end

        it 'calls #error' do
          execute rescue nil
          expect(service).not_to have_received(:success)
          expect(service).to have_received(:error)
        end
      end

      context 'when committing result to database succeeds' do
        before do
          allow_any_instance_of(PKParse::Client)
            .to receive(:parse_base64).and_return(client_response)
        end

        it 'creates some new pokemon' do
          expect { execute }.to change(Pokemon, :count).by(1)
        end

        it 'calls #success' do
          execute

          expect(service).to have_received(:success).once
          expect(service).not_to have_received(:error)
        end
      end
    end

    context 'when parsing fails' do
      before do
        allow_any_instance_of(PKParse::Client)
          .to(receive(:parse_base64)
              .and_raise(PKParse::Error.new(StandardError.new)))
      end

      it 'does not create any new pokemon' do
        expect { execute }.to change(Pokemon, :count).by(0)

        expect(service).not_to have_received(:success)
        expect(service).to have_received(:error)
      end
    end

    describe '#success' do
      it 'calls super method' do
        allow_any_instance_of(PKParse::Client)
          .to receive(:parse_base64).and_return(client_response)
        expect_any_instance_of(service.class.superclass)
          .to receive(:success).once

        execute
        expect(service).to have_received(:success).once
      end
    end
  end
end