pokemon.trade/spec/controllers/api/v1/pokemon_controller_spec.rb

# frozen_string_literal: true

require 'rails_helper'

RSpec.describe API::V1::PokemonController, type: :controller do
  def non_existant_pokemon_id(initial_id = 1)
    id = initial_id
    id *= 2 while Pokemon.find_by(id: id)
    id
  end

  describe 'DELETE #destroy' do
    let!(:pokemon) { FactoryBot.create(:pokemon) }
    subject { delete :destroy, params: {id: pokemon.id} }

    context 'the pokemon is successfully deleted' do
      it 'deletes the pokemon' do
        expect{subject}.to change{Pokemon.count}.by(-1)
        expect(response).to render_template 'api/v1/pokemon/show'
      end
    end

    context 'the pokemon is not deleted' do
      before { allow_any_instance_of(Pokemon).to receive(:destroy).and_return(false) }

      it 'does not delete the pokemon' do
        expect{subject}.to change{Pokemon.count}.by(0)
        expect(response).to render_template 'api/v1/application/_error'
      end
    end

    context 'the pokemon does not exist' do
      let(:pokemon) { double(id: non_existant_pokemon_id) }

      it 'raises an error' do
        expect{subject rescue nil}.to change{Pokemon.count}.by(0)
        expect(response).to render_template 'api/v1/application/_error'
      end
    end
  end

  describe 'POST #upload' do
    subject { post :upload, params: {pokemon: double} }
    let(:client_response) { double(pokemon: [pokemon]) }

    let(:pokemon) do
      double(pokedex_number: 10, nickname: 'pyukuchu', to_h: {pokedex_number: 10, nickname: 'pyukuchu'})
    end

    before do
      allow_any_instance_of(PKParse::Client).to receive(:parse).and_return(client_response)
    end

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

        it 'does not create any new pokemon' do
          # expect{subject}.to raise_error 'canned failure'
          expect{(subject rescue nil)}.to change{Pokemon.count}.by(0)
          expect(response).to render_template 'api/v1/application/_error'
        end
      end

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

        it 'creates some new pokemon' do
          expect{subject}.to change{Pokemon.count}.by(1)
          expect(response).to render_template 'api/v1/pokemon/index'
        end
      end
    end

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

      it 'does not create any new pokemon' do
        expect{subject}.to change{Pokemon.count}.by(0)
        expect(response).to render_template 'api/v1/application/_error'
      end
    end
  end

  describe 'GET #show' do
    context 'the pokemon exists' do
      let!(:pokemon) { FactoryBot.create(:pokemon) }
      subject { get :show, params: {id: pokemon.id}, format: :json }

      it 'renders the pokemon JSON' do
        subject
        expect(response).to render_template 'api/v1/pokemon/show'
      end
    end
  end
end