Add feature specs for shipping methods

- Added feature specs for creating and editing shipping methods.

Author: JustShah

admin/spec/features/shipping_methods_spec.rb

@@ -27,4 +27,42 @@
     expect(page).to have_content("Add new")
     expect(page).to have_selector(:css, 'a[href="/admin/shipping_methods/new"]')
   end
+
+  context "when creating a new shipping method" do
+    before do
+      create(:shipping_category, name: "Default")
+
+      visit "/admin/shipping_methods/new"
+    end
+
+    it "creates the shipping method", :js do
+      fill_in "Name", with: "Super Saver"
+      fill_in "Code", with: "super-saver"
+      fill_in "Carrier", with: "CarrierX"
+      fill_in "Tracking URL", with: "https://track.example.com/:tracking"
+
+      check "Available to all stock locations"
+      check "Available to users"
+      solidus_select "Default", from: "Shipping Categories"
+
+      click_on "Save"
+
+      expect(page).to have_content("Shipping method was successfully created.")
+      expect(Spree::ShippingMethod.find_by(name: "Super Saver")).to be_present
+    end
+  end
+
+  context "when editing an existing shipping method" do
+    let!(:shipping_method) { create(:shipping_method, name: "Old Name") }
+
+    before { visit spree.edit_admin_shipping_method_path(shipping_method) }
+
+    it "updates the shipping method", :js do
+      fill_in "Name", with: "New Name"
+      click_on "Save"
+
+      expect(page).to have_content("Shipping method was successfully updated.")
+      expect(page).to have_content("New Name")
+    end
+  end
 end