cart and checkout

pkg/promotions/eval_test.go

@@ -442,6 +442,45 @@ func TestDateRangeCondition(t *testing.T) {
 	}
 }
 
+func TestCouponCodeCondition(t *testing.T) {
+	rule := PromotionRule{
+		ID:     "coupon-promo",
+		Name:   "Coupon Promo",
+		Status: StatusActive,
+		Conditions: Conditions{
+			BaseCondition{
+				ID:       "c",
+				Type:     CondCouponCode,
+				Operator: OpEquals,
+				Value:    cvString("SAVE50"),
+			},
+		},
+		Actions: []Action{{ID: "a", Type: ActionFixedDiscount, Value: 500}},
+	}
+
+	svc := NewPromotionService(nil)
+
+	// Context with matching coupon code
+	ctxMatched := &PromotionEvalContext{
+		CouponCodes: []string{"SAVE50"},
+		Now:         time.Now(),
+	}
+	resMatched := svc.EvaluateRule(rule, ctxMatched)
+	if !resMatched.Applicable {
+		t.Errorf("expected coupon code rule to apply with SAVE50")
+	}
+
+	// Context without matching coupon code
+	ctxUnmatched := &PromotionEvalContext{
+		CouponCodes: []string{"SAVE20"},
+		Now:         time.Now(),
+	}
+	resUnmatched := svc.EvaluateRule(rule, ctxUnmatched)
+	if resUnmatched.Applicable {
+		t.Errorf("expected coupon code rule NOT to apply with SAVE20")
+	}
+}
+
 // --- Utilities -------------------------------------------------------------
 
 func ptr(s string) *string { return &s }