Fix tests failing (#36)

Reviewed-on: #36

backend/main.go

@@ -62,15 +62,15 @@ func getUser(c *gin.Context) {
 	}
 
 	user, err := db.GetUser(userId)
+	if errors.Is(err, mysqlite.ErrNoRows) {
+		c.JSON(http.StatusNotFound, gin.H{"error": ErrUserNotFound})
+		return
+	}
 	if err != nil {
 		log.Printf("Error getting user: %v", err)
 		c.JSON(http.StatusInternalServerError, gin.H{"error": ErrInternalServerError})
 		return
 	}
-	if user == nil {
-		c.JSON(http.StatusNotFound, gin.H{"error": ErrUserNotFound})
-		return
-	}
 
 	c.IndentedJSON(http.StatusOK, user)
 }
@@ -305,6 +305,17 @@ func postAllowance(c *gin.Context) {
 		return
 	}
 
+	exists, err := db.UserExists(userId)
+	if err != nil {
+		log.Printf(ErrCheckingUserExist, err)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": ErrInternalServerError})
+		return
+	}
+	if !exists {
+		c.JSON(http.StatusNotFound, gin.H{"error": ErrUserNotFound})
+		return
+	}
+
 	err = db.AddAllowance(userId, &allowanceRequest)
 	if err != nil {
 		log.Printf("Error updating allowance: %v", err)