btrc-hub/backend/spec/requests/error_responses_spec.rb

require 'rails_helper'

RSpec.describe 'error responses', type: :request do
  describe 'manual input errors' do
    it 'returns a stable errors array for bad requests' do
      user = create(:user)
      sign_in_as(user)

      put "/users/#{ user.id }", params: { name: '   ' }

      expect(response).to have_http_status(:bad_request)
      expect(json.fetch('errors')).to contain_exactly(
          include('code' => 'bad_request',
                  'field' => 'name',
                  'message' => be_present))
    end

    it 'returns a stable errors array for unprocessable requests' do
      member = create(:user, :member)
      tag = create(:tag, :general, name: 'error_response_tag')
      sign_in_as(member)

      patch "/tags/#{ tag.id }", params: { category: 'nico' }

      expect(response).to have_http_status(:unprocessable_entity)
      expect(json.fetch('errors')).to contain_exactly(
          include('code' => 'invalid',
                  'field' => 'category',
                  'message' => be_present))
    end
  end

  describe 'model validation errors' do
    it 'returns field, code, and message for model errors' do
      user = create(:user)
      sign_in_as(user)

      put "/users/#{ user.id }", params: { name: 'a' * 256 }

      expect(response).to have_http_status(:unprocessable_entity)
      expect(json.fetch('errors')).to include(
          include('code' => 'too_long',
                  'field' => 'name',
                  'message' => be_present))
    end
  end
end