Add a simple spec for the shipping calculator

We are going to be changing the shipping calculator, so we should add a
simple spec to test the existing behavior.

Co-authored-by: Nick Van Doorn <nick@super.gd>

1 files changed, 10 insertions, 0 deletions

diff --git a/spec/super_good/solidus_taxjar_spec.rb b/spec/super_good/solidus_taxjar_spec.rb
index 6236b2f..7fe0dee 100644
--- a/spec/super_good/solidus_taxjar_spec.rb
+++ b/spec/super_good/solidus_taxjar_spec.rb
@@ -73,5 +73,15 @@ RSpec.describe SuperGood::SolidusTaxjar do
       let(:spree_line_item) { Spree::LineItem.new }
       it { is_expected.to eq "Sales Tax" }
     end
+
+    describe ".shipping_calculator" do
+      subject { described_class.shipping_calculator.call(order) }
+
+      let(:order) { instance_double(Spree::Order, shipment_total: 10) }
+
+      it "returns the shipment total" do
+        expect(subject).to eq(10)
+      end
+    end
   end
 end