Moves tests to shared examples file

spec/services/order_invoice_comparator_shared_examples_spec.rb

@@ -0,0 +1,90 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+shared_examples "attribute changes - payment total" do |boolean, type|
+  before do
+    Spree::Order.where(id: order.id).update_all(payment_total: order.payment_total + 10)
+  end
+
+  it "returns #{boolean} if a #{type} attribute changes" do
+    order.reload
+    expect(subject).to be boolean
+  end
+end
+
+shared_examples "attribute changes - order total" do |boolean, type|
+  before do
+    Spree::Order.where(id: order.id).update_all(total: order.total + 10)
+  end
+
+  it "returns #{boolean} if a #{type} attribute changes" do
+    order.reload
+    expect(subject).to be boolean
+  end
+end
+
+shared_examples "attribute changes - order state: cancelled" do |boolean, type|
+  before do
+    order.cancel!
+  end
+
+  it "returns #{boolean} if a #{type} attribute changes" do
+    pending("A new invoice should not be generated upon order state change")
+    order.reload
+    expect(subject).to be boolean
+  end
+end
+
+describe OrderInvoiceComparator do
+  describe '#can_generate_new_invoice?' do
+    # this passes 'order' as argument to the invoice comparator
+    let(:order) { create(:completed_order_with_fees) }
+    let!(:invoice_data_generator){ InvoiceDataGenerator.new(order) }
+    let!(:invoice){
+      create(:invoice,
+             order:,
+             data: invoice_data_generator.serialize_for_invoice)
+    }
+    let(:subject) {
+      OrderInvoiceComparator.new(order).can_generate_new_invoice?
+    }
+
+    context "changes on the order object" do
+      describe "detecting relevant" do
+        it_behaves_like "attribute changes - payment total", true, "relevant"
+        it_behaves_like "attribute changes - order total", true, "relevant"
+        it_behaves_like "attribute changes - order state: cancelled", true, "relevant"
+      end
+
+      describe "detecting non-relevant" do
+        it_behaves_like "attribute changes - order state: cancelled", false, "non-relevant"
+      end
+    end
+  end
+
+  describe '#can_update_latest_invoice?' do
+    let!(:order) { create(:completed_order_with_fees) }
+    let!(:invoice_data_generator){ InvoiceDataGenerator.new(order) }
+    let!(:invoice){
+      create(:invoice,
+             order:,
+             data: invoice_data_generator.serialize_for_invoice)
+    }
+    let(:subject) {
+      OrderInvoiceComparator.new(order).can_update_latest_invoice?
+    }
+
+    context "changes on the order object" do
+      describe "detecting relevant" do
+        it_behaves_like "attribute changes - order state: cancelled", true, "relevant"
+      end
+
+      describe "detecting non-relevant" do
+        it_behaves_like "attribute changes - payment total", false, "non-relevant"
+        it_behaves_like "attribute changes - order total", false, "non-relevant"
+        it_behaves_like "attribute changes - order state: cancelled", true, "non-relevant"
+      end
+    end
+  end
+end

spec/services/order_invoice_comparator_spec.rb

@@ -30,17 +30,6 @@
           expect(subject).to be true
         end
 
-        it "returns true if a relevant attribute changes - order state: cancelled" do
-          order.cancel!
-          expect(subject).to be true
-        end
-
-        it "returns true if a relevant attribute changes - order state: resumed" do
-          order.cancel!
-          order.resume!
-          expect(subject).to be true
-        end
-
         context "additional tax total changes" do
           let(:order) do
             create(:order_with_taxes, product_price: 110, tax_rate_amount: 0.1,