feat: Add Google One Tap experiment

Author: AshCorr

dotcom-rendering/src/experiments/ab-tests.ts

@@ -4,6 +4,7 @@ import { auxiaSignInGate } from './tests/auxia-sign-in-gate';
 import { signInGateMainControl } from './tests/sign-in-gate-main-control';
 import { signInGateMainVariant } from './tests/sign-in-gate-main-variant';
 import { userBenefitsApi } from './tests/user-benefits-api';
+import { googleOneTap } from './tests/google-one-tap';
 
 // keep in sync with ab-tests in frontend
 // https://github.com/guardian/frontend/tree/main/static/src/javascripts/projects/common/modules/experiments/ab-tests.ts
@@ -13,4 +14,5 @@ export const tests: ABTest[] = [
 	signInGateMainControl,
 	userBenefitsApi,
 	auxiaSignInGate,
+	googleOneTap,
 ];

dotcom-rendering/src/experiments/tests/google-one-tap.ts

@@ -0,0 +1,25 @@
+import type { ABTest } from '@guardian/ab-core';
+
+export const googleOneTap: ABTest = {
+	id: 'GoogleOneTap',
+	start: '2025-07-30',
+	expiry: '2025-12-01',
+	author: 'Ash (Identity & Trust)',
+	description:
+		'This test is being used to prototype and roll out single sign-on with Google One Tap.',
+	audience: 0,
+	audienceOffset: 0,
+	successMeasure:
+		'There are no new client side errors and the users are able to sign in with Google One Tap',
+	audienceCriteria: 'Signed-out Chrome Users on Fronts',
+	idealOutcome:
+		'Increased sign in conversion rate for users who have Google accounts and Chrome',
+	showForSensitive: false,
+	canRun: () => true,
+	variants: [
+		{
+			id: 'google-one-tap',
+			test: () => {},
+		},
+	],
+};