1 files changed, 10 insertions, 0 deletions
diff --git a/spec/models/product_cart_spec.rb b/spec/models/product_cart_spec.rb
index 2c4d9d1..46860d3 100644
--- a/spec/models/product_cart_spec.rb
+++ b/spec/models/product_cart_spec.rb
@@ -20,4 +20,14 @@ RSpec.describe ProductCart, type: :model do
       expect(another_product_cart.errors[:product_id]).to be_present
     end
   end
+
+  describe '#product_quantity' do
+    it "validates the requested quantity against the product's available quantity" do
+      product = create(:product, available_quantity: 5)
+      another_product_cart = build(:product_cart, cart: product_cart.cart, product:, quantity: 10)
+
+      expect(another_product_cart.save).to be_falsey
+      expect(another_product_cart.errors[:product_id][0]).to eq('not enough in existence')
+    end
+  end
 end