Add specs testing that shipments see deleted variants

spec/models/spree/shipment_spec.rb

@@ -0,0 +1,33 @@
+require "spec_helper"
+
+describe Spree::Shipment do
+  describe "manifest" do
+    let!(:product) { create(:product) }
+    let!(:order) { create(:order, distributor: product.supplier) }
+    let!(:deleted_variant) { create(:variant, product: product) }
+    let!(:other_variant) { create(:variant, product: product) }
+    let!(:line_item_for_deleted) { create(:line_item, order: order, variant: deleted_variant) }
+    let!(:line_item_for_other) { create(:line_item, order: order, variant: other_variant) }
+    let!(:shipment) { create(:shipment_with, :shipping_method, order: order) }
+
+    context "when the variant is soft-deleted" do
+      before { deleted_variant.delete }
+
+      it "can still access the variant" do
+        shipment.reload
+        variants = shipment.manifest.map(&:variant).uniq
+        expect(variants.sort_by(&:id)).to eq([deleted_variant, other_variant].sort_by(&:id))
+      end
+    end
+
+    context "when the product is soft-deleted" do
+      before { deleted_variant.product.delete }
+
+      it "can still access the variant" do
+        shipment.reload
+        variants = shipment.manifest.map(&:variant)
+        expect(variants.sort_by(&:id)).to eq([deleted_variant, other_variant].sort_by(&:id))
+      end
+    end
+  end
+end