Add nexus regions method to API

We want to start syncing nexus data from TaxJar to this extension. As
such we start by implementing an API call to fetch nexus regions from
TaxJar.

Future commits should offer path for users to persist this data in their
Solidus store.

Co-authored-by: Noah Silvera <noah@super.gd>
Co-authored-by: Adnan Abdulally <adnan.abdulally@printivity.com>

2 files changed, 19 insertions, 0 deletions

diff --git a/lib/super_good/solidus_taxjar/api.rb b/lib/super_good/solidus_taxjar/api.rb
index 096994b..715eb5c 100644
--- a/lib/super_good/solidus_taxjar/api.rb
+++ b/lib/super_good/solidus_taxjar/api.rb
@@ -55,6 +55,10 @@ module SuperGood
         taxjar_client.validate_address ApiParams.validate_address_params(spree_address)
       end
 
+      def nexus_regions
+        taxjar_client.nexus_regions
+      end
+
       private
 
       attr_reader :taxjar_client
diff --git a/spec/super_good/solidus_taxjar/api_spec.rb b/spec/super_good/solidus_taxjar/api_spec.rb
index 94f214d..df46a11 100644
--- a/spec/super_good/solidus_taxjar/api_spec.rb
+++ b/spec/super_good/solidus_taxjar/api_spec.rb
@@ -202,4 +202,19 @@ RSpec.describe SuperGood::SolidusTaxjar::Api do
 
     it { is_expected.to eq({some_kind_of: "response"}) }
   end
+
+  describe "#nexus_regions" do
+    subject { api.nexus_regions }
+
+    let(:api) { described_class.new(taxjar_client: dummy_client) }
+    let(:dummy_client) { instance_double ::Taxjar::Client }
+
+    before do
+      allow(dummy_client)
+        .to receive(:nexus_regions)
+        .and_return({some_kind_of: "response"})
+    end
+
+    it { is_expected.to eq({some_kind_of: "response"}) }
+  end
 end