added additional tests for parent id

internal/controllers/user_controller.go

@@ -1,6 +1,8 @@
 package controllers
 
 import (
+	"fmt"
+
 	"GoMembership/internal/models"
 	"GoMembership/internal/services"
 
@@ -45,7 +47,7 @@ func (uc *UserController) RegisterUser(c *gin.Context) {
 	id, token, err := uc.Service.RegisterUser(&regData.User)
 	if err != nil {
 		logger.Error.Printf("Couldn't register User: %v", err)
-		c.JSON(http.StatusInternalServerError, gin.H{"error": "Couldn't register User"})
+		c.JSON(http.StatusInternalServerError, gin.H{"error": fmt.Sprintf("Couldn't register User: %v", err)})
 		return
 	}
 	regData.User.ID = id
@@ -85,7 +87,6 @@ func (uc *UserController) RegisterUser(c *gin.Context) {
 		logger.Error.Printf("Failed to notify admin of new user registration: %v", err)
 		// Proceed without returning error since user registration is successful
 	}
-
 	c.JSON(http.StatusCreated, gin.H{
 		"status": "success",
 		"id":     regData.User.ID,