Make validator deterministic

backend/package.json

@@ -52,6 +52,7 @@
     "pino-pretty": "10.2.3",
     "pkg-dir": "7.0.0",
     "pprof": "3.2.1",
+    "prando": "6.0.1",
     "query-string": "8.1.0",
     "ramda": "0.28.0",
     "reflect-metadata": "0.2.2",

backend/src/common/validation/v1/services/validation/Scenarios/Availability/AvailabilityCheckInterval.ts

@@ -3,6 +3,7 @@ import { Scenario, ScenarioResult } from '../Scenario';
 import { AvailabilityScenarioHelper } from '../../helpers/AvailabilityScenarioHelper';
 import descriptions from '../../consts/descriptions';
 import { Context } from '../../context/Context';
+import Prando from 'prando';
 
 export class AvailabilityChecIntervalScenario implements Scenario {
   private readonly product: Product;
@@ -26,7 +27,8 @@ export class AvailabilityChecIntervalScenario implements Scenario {
     );
 
     const availabilities = result.data ?? [];
-    const randomAvailability = availabilities[Math.floor(Math.random() * availabilities.length)] ?? null;
+    const randomAvailability =
+      availabilities[new Prando(availabilities.length).nextInt(0, availabilities.length - 1)] ?? null;
 
     if (randomAvailability === null) {
       context.terminateValidation = true;

backend/src/common/validation/v1/services/validation/context/ProductBookable.ts

@@ -1,8 +1,5 @@
 import { BookingUnitItemSchema, Option, Product, UnitType } from '@octocloud/types';
-
-const randomInteger = (min: number, max: number): number => {
-  return Math.floor(Math.random() * (max - min + 1)) + min;
-};
+import Prando from 'prando';
 
 interface GetUnitItemsData {
   quantity: number;
@@ -59,7 +56,7 @@ export class ProductBookable {
   };
 
   private readonly pickRandomAvailabilityID = (array: string[]): string => {
-    return array[Math.floor(Math.random() * array.length)];
+    return array[new Prando(array.length).nextInt(0, array.length - 1)];
   };
 
   public getValidUnitItems = (data?: GetUnitItemsData): BookingUnitItemSchema[] => {
@@ -68,7 +65,8 @@ export class ProductBookable {
     const unitId = unit.id;
 
     const quantity =
-      data?.quantity ?? randomInteger(option.restrictions.minUnits || 1, option.restrictions.maxUnits ?? 5);
+      data?.quantity ??
+      new Prando(option.id).nextInt(option.restrictions.minUnits || 1, option.restrictions.maxUnits ?? 5);
     return Array(quantity).fill({ unitId });
   };