feat(finance): show sum of ordergroup balances

spec/controllers/finance/ordergroups_controller_spec.rb

@@ -0,0 +1,50 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Finance::OrdergroupsController do
+  let(:user) { create(:user, :role_finance, :role_orders, :ordergroup) }
+  let(:fin_trans_type1) { create(:financial_transaction_type) }
+  let(:fin_trans_type2) { create(:financial_transaction_type) }
+  let(:fin_trans1) do
+    create(:financial_transaction,
+           user: user,
+           ordergroup: user.ordergroup,
+           financial_transaction_type: fin_trans_type1)
+  end
+  let(:fin_trans2) do
+    create(:financial_transaction,
+           user: user,
+           ordergroup: user.ordergroup,
+           financial_transaction_type: fin_trans_type1)
+  end
+  let(:fin_trans3) do
+    create(:financial_transaction,
+           user: user,
+           ordergroup: user.ordergroup,
+           financial_transaction_type: fin_trans_type2)
+  end
+
+  before { login user }
+
+  describe 'GET index' do
+    before do
+      fin_trans1
+      fin_trans2
+      fin_trans3
+    end
+
+    it 'renders index page' do
+      get_with_defaults :index
+      expect(response).to have_http_status(:success)
+      expect(response).to render_template('finance/ordergroups/index')
+    end
+
+    it 'calculates total balance sums correctly' do
+      get_with_defaults :index
+      expect(assigns(:total_balances).size).to eq(2)
+      expect(assigns(:total_balances)[fin_trans_type1.id]).to eq(fin_trans1.amount + fin_trans2.amount)
+      expect(assigns(:total_balances)[fin_trans_type2.id]).to eq(fin_trans3.amount)
+    end
+  end
+end