1 files changed, 8 insertions, 0 deletions
diff --git a/spec/models/product_cart_spec.rb b/spec/models/product_cart_spec.rb
index 00a8f6c..2c4d9d1 100644
--- a/spec/models/product_cart_spec.rb
+++ b/spec/models/product_cart_spec.rb
@@ -12,4 +12,12 @@ RSpec.describe ProductCart, type: :model do
   it 'should belong to cart' do
     expect(product_cart).to respond_to(:cart)
   end
+
+  describe '#sole_product_in_cart' do
+    it 'validates for duplicate products in the cart' do
+      another_product_cart = build(:product_cart, cart: product_cart.cart, product: product_cart.product)
+      expect(another_product_cart.save).to be_falsey
+      expect(another_product_cart.errors[:product_id]).to be_present
+    end
+  end
 end