Add unit tests to order_cart_reset

spec/services/order_cart_reset_spec.rb

@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe OrderCartReset do
+  let(:distributor) { create(:distributor_enterprise) }
+  let(:order) { create(:order, :with_line_item, distributor: distributor) }
+
+  context "if order distributor is not the requested distributor" do
+    let(:new_distributor) { create(:distributor_enterprise) }
+
+    it "empties order" do
+      OrderCartReset.new(order, new_distributor.id.to_s, nil, nil).call
+
+      expect(order.line_items).to be_empty
+    end
+  end
+
+  context "if the order's order cycle is not in the list of visible order cycles" do
+    let(:order_cycle) { create(:simple_order_cycle, distributors: [distributor]) }
+    let(:order_cycle_list) { instance_double(Shop::OrderCyclesList) }
+
+    before do
+      expect(Shop::OrderCyclesList).to receive(:new).and_return(order_cycle_list)
+      order.update_attribute :order_cycle, order_cycle
+    end
+
+    it "empties order and makes order cycle nil" do
+      expect(order_cycle_list).to receive(:call).and_return([])
+
+      OrderCartReset.new(order, distributor.id.to_s, nil, nil).call
+
+      expect(order.line_items).to be_empty
+      expect(order.order_cycle).to be_nil
+    end
+
+    it "selects default Order Cycle if there's one" do
+      other_order_cycle = create(:simple_order_cycle, distributors: [distributor])
+      expect(order_cycle_list).to receive(:call).and_return([other_order_cycle])
+
+      OrderCartReset.new(order, distributor.id.to_s, nil, nil).call
+
+      expect(order.order_cycle).to eq other_order_cycle
+    end
+  end
+end