Use Spree Taxon Controller instead of API Taxon Controller

Add tests for reordering taxons

app/assets/javascripts/admin/spree/taxons/taxonomy.js.coffee

@@ -8,7 +8,7 @@ handle_move = (e, data) ->
   node = data.rslt.o
   new_parent = data.rslt.np
 
-  url = new URL(base_url)
+  url = new URL(Spree.routes.admin_taxonomy_taxons)
   url.pathname = url.pathname + '/' + node.attr("id") 
   data = {
     _method: "put",

spec/controllers/spree/admin/taxons_controller_spec.rb

@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Spree::Admin::TaxonsController do
+  render_views
+
+  let(:taxonomy) { create(:taxonomy) }
+  let(:taxon) { create(:taxon, name: "Ruby", taxonomy: taxonomy) }
+  let(:taxon2) { create(:taxon, name: "Rails", taxonomy: taxonomy) }
+
+  before do
+    allow(controller).to receive(:spree_current_user) { current_api_user }
+
+    taxonomy.root.children << taxon
+    taxonomy.root.children << taxon2
+  end
+
+  context "as an admin" do
+    let(:current_api_user) { build(:admin_user) }
+
+    it "can reorder taxons" do
+      spree_post :update,
+                 taxonomy_id: taxonomy.id,
+                 id: taxon2.id,
+                 taxon: { parent_id: taxonomy.root.id, position: 0 }
+
+      expect(taxon2.reload.lft).to eq 2
+      expect(Spree::Taxonomy.find(taxonomy.id).root.children.first).to eq(taxon2)
+    end
+  end
+end