Added spec for OrderPaymentFinder

spec/services/order_payment_finder_spec.rb

@@ -0,0 +1,47 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe OrderPaymentFinder do
+  let(:order) { create(:order_with_distributor) }
+  let(:finder) { OrderPaymentFinder.new(order) }
+
+  context "when order has several non pending payments" do
+    let!(:failed_payment) { create(:payment, order: order, state: 'failed') }
+    let!(:complete_payment) { create(:payment, order: order, state: 'completed') }
+
+    it "#last_payment returns the last payment" do
+      expect(finder.last_payment).to eq complete_payment
+    end
+
+    it "#last_pending_payment returns nil" do
+      expect(finder.last_pending_payment).to be nil
+    end
+  end
+
+  context "when order has a pending payment and a non pending payment" do
+    let!(:processing_payment) { create(:payment, order: order, state: 'processing') }
+    let!(:failed_payment) { create(:payment, order: order, state: 'failed') }
+
+    it "#last_payment returns the last payment" do
+      expect(finder.last_payment).to eq failed_payment
+    end
+
+    it "#last_pending_payment returns the pending payment" do
+      # a payment in the processing state is a pending payment
+      expect(finder.last_pending_payment).to eq processing_payment
+    end
+
+    context "and an extra last pending payment" do
+      let!(:pending_payment) { create(:payment, order: order, state: 'pending') }
+
+      it "#last_payment returns the last payment" do
+        expect(finder.last_payment).to eq pending_payment
+      end
+
+      it "#last_pending_payment returns the pending payment" do
+        expect(finder.last_pending_payment).to eq pending_payment
+      end
+    end
+  end
+end