Only check abParticipations in session storage if persistPage is defi…

…ned in the abTestDefinition (#6691)

* only check abParticipations in session storage if persistPage defined

* small refactor

* store participations which use the persistPage prop in sessionStorage

support-frontend/assets/helpers/abTests/abtest.ts

@@ -187,6 +187,7 @@ function getParticipations(
 
 		// Is the user already in this test in the current browser session?
 		if (
+			test.persistPage &&
 			!!sessionParticipations[testId] &&
 			targetPageMatches(path, test.persistPage)
 		) {
@@ -263,6 +264,14 @@ function getParticipations(
 		});
 	}
 
+	// Store participations which use the persistPage prop in sessionStorage
+	Object.keys(participations).forEach((testId) => {
+		if (abTests[testId]?.persistPage) {
+			sessionParticipations[testId] = participations[testId];
+		}
+	});
+	storage.setSession('abParticipations', JSON.stringify(sessionParticipations));
+
 	return participations;
 }
 

support-frontend/assets/pages/supporter-plus-landing/twoStepPages/threeTierLanding.tsx

@@ -53,7 +53,6 @@ import {
 import type { BillingPeriod } from 'helpers/productPrice/billingPeriods';
 import type { Promotion } from 'helpers/productPrice/promotions';
 import { getPromotion } from 'helpers/productPrice/promotions';
-import * as storage from 'helpers/storage/storage';
 import type { GeoId } from 'pages/geoIdConfig';
 import { getGeoIdConfig } from 'pages/geoIdConfig';
 import Countdown from '../components/countdown';
@@ -292,9 +291,6 @@ export function ThreeTierLanding({
 		subPath: '/contribute',
 	};
 
-	// Persist any tests for tracking in the checkout page
-	storage.setSession('abParticipations', JSON.stringify(abParticipations));
-
 	const campaignSettings = getCampaignSettings(
 		countryGroupId,
 		urlSearchParamsPromoCode,