feat: Add promotion code functionality to ticket orders

test/controllers/orders_controller_promotion_test.rb

@@ -0,0 +1,66 @@
+require "test_helper"
+
+class OrdersControllerPromotionTest < ActionDispatch::IntegrationTest
+  include Devise::Test::IntegrationHelpers
+
+  # Setup test data
+  def setup
+    @user = users(:one)
+    @event = events(:one)
+    @order = orders(:one)
+    sign_in @user
+  end
+
+  # Test applying a valid promotion code
+  def test_apply_valid_promotion_code
+    promotion_code = PromotionCode.create(
+      code: "TESTDISCOUNT",
+      discount_amount_cents: 1000, # €10.00
+      expires_at: 1.month.from_now,
+      active: true
+    )
+
+    get checkout_order_path(@order), params: { promotion_code: "TESTDISCOUNT" }
+    assert_response :success
+    assert_not_nil flash[:notice]
+    assert_match /Code promotionnel appliqué: TESTDISCOUNT/, flash[:notice]
+  end
+
+  # Test applying an invalid promotion code
+  def test_apply_invalid_promotion_code
+    get checkout_order_path(@order), params: { promotion_code: "INVALIDCODE" }
+    assert_response :success
+    assert_not_nil flash[:alert]
+    assert_equal "Code promotionnel invalide", flash[:alert]
+  end
+
+  # Test applying an expired promotion code
+  def test_apply_expired_promotion_code
+    promotion_code = PromotionCode.create(
+      code: "EXPIREDCODE",
+      discount_amount_cents: 1000,
+      expires_at: 1.day.ago,
+      active: true
+    )
+
+    get checkout_order_path(@order), params: { promotion_code: "EXPIREDCODE" }
+    assert_response :success
+    assert_not_nil flash[:alert]
+    assert_equal "Code promotionnel invalide", flash[:alert]
+  end
+
+  # Test applying an inactive promotion code
+  def test_apply_inactive_promotion_code
+    promotion_code = PromotionCode.create(
+      code: "INACTIVECODE",
+      discount_amount_cents: 1000,
+      expires_at: 1.month.from_now,
+      active: false
+    )
+
+    get checkout_order_path(@order), params: { promotion_code: "INACTIVECODE" }
+    assert_response :success
+    assert_not_nil flash[:alert]
+    assert_equal "Code promotionnel invalide", flash[:alert]
+  end
+end