Add extract_spec.rb for customer extracts

spec/requests/transactions/extract_spec.rb

@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe 'GET - /customers/:id/extracts' do
+  let(:customer) { create(:customer) }
+  let(:url) { "/customers/#{customer.id}/extracts" }
+
+  context 'when the request is valid' do
+    it 'returns status code 200' do
+      get(url)
+
+      expect(response).to have_http_status(:ok)
+    end
+
+    it 'returns the customer extract' do
+      get(url)
+
+      expect(response.parsed_body['extract']['balance'].keys).to match_array(%w[total date limit])
+      expect(response.parsed_body['extract']['transactions']).to eq([])
+    end
+
+    it 'returns the customer extract with transactions' do
+      transactions = create_list(:transaction, 10, customer:)
+      transaction_attributes = %w[id kind date amount description]
+
+      get(url)
+
+      response_transactions_last_id = response.parsed_body['extract']['transactions'].last[:id]
+
+      expect(response.parsed_body['extract']['transactions'].size).to eq(10)
+      expect(response.parsed_body['extract']['transactions'].last.keys).to match_array(transaction_attributes)
+      expect(response_transactions_last_id).to be_in(transactions.map(&:id))
+    end
+
+    it 'raises an error when the customer does not exist' do
+      get("/customers/#{SecureRandom.uuid}/extracts")
+
+      expect(response).to have_http_status(:not_found)
+    end
+  end
+end