diff --git a/config/src/test/java/org/springframework/security/config/annotation/method/configuration/ReactiveMethodSecurityConfigurationTests.java b/config/src/test/java/org/springframework/security/config/annotation/method/configuration/ReactiveMethodSecurityConfigurationTests.java
index 5f2045e9099..b3a566086f5 100644
--- a/config/src/test/java/org/springframework/security/config/annotation/method/configuration/ReactiveMethodSecurityConfigurationTests.java
+++ b/config/src/test/java/org/springframework/security/config/annotation/method/configuration/ReactiveMethodSecurityConfigurationTests.java
@@ -20,6 +20,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
+import java.util.function.Consumer;
 import java.util.function.Function;
 
 import org.junit.jupiter.api.Test;
@@ -40,12 +41,14 @@
 import org.springframework.security.access.prepost.PostFilter;
 import org.springframework.security.access.prepost.PreAuthorize;
 import org.springframework.security.access.prepost.PreFilter;
-import org.springframework.security.authentication.TestingAuthenticationToken;
+import org.springframework.security.authentication.TestAuthentication;
 import org.springframework.security.authorization.method.AuthorizeReturnObject;
 import org.springframework.security.config.core.GrantedAuthorityDefaults;
 import org.springframework.security.config.test.SpringTestContext;
 import org.springframework.security.config.test.SpringTestContextExtension;
+import org.springframework.security.core.Authentication;
 import org.springframework.security.core.context.ReactiveSecurityContextHolder;
+import org.springframework.security.core.userdetails.User;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -63,8 +66,7 @@ public class ReactiveMethodSecurityConfigurationTests {
 	@Test
 	public void rolePrefixWithGrantedAuthorityDefaults() throws NoSuchMethodException {
 		this.spring.register(WithRolePrefixConfiguration.class).autowire();
-		TestingAuthenticationToken authentication = new TestingAuthenticationToken("principal", "credential",
-				"CUSTOM_ABC");
+		Authentication authentication = TestAuthentication.authenticatedUser(authorities("CUSTOM_ABC"));
 		MockMethodInvocation methodInvocation = new MockMethodInvocation(new Foo(), Foo.class, "bar", String.class);
 		EvaluationContext context = this.methodSecurityExpressionHandler.createEvaluationContext(authentication,
 				methodInvocation);
@@ -78,8 +80,7 @@ public void rolePrefixWithGrantedAuthorityDefaults() throws NoSuchMethodExceptio
 	@Test
 	public void rolePrefixWithDefaultConfig() throws NoSuchMethodException {
 		this.spring.register(ReactiveMethodSecurityConfiguration.class).autowire();
-		TestingAuthenticationToken authentication = new TestingAuthenticationToken("principal", "credential",
-				"ROLE_ABC");
+		Authentication authentication = TestAuthentication.authenticatedUser(authorities("ROLE_ABC"));
 		MockMethodInvocation methodInvocation = new MockMethodInvocation(new Foo(), Foo.class, "bar", String.class);
 		EvaluationContext context = this.methodSecurityExpressionHandler.createEvaluationContext(authentication,
 				methodInvocation);
@@ -91,8 +92,7 @@ public void rolePrefixWithDefaultConfig() throws NoSuchMethodException {
 	@Test
 	public void rolePrefixWithGrantedAuthorityDefaultsAndSubclassWithProxyingEnabled() throws NoSuchMethodException {
 		this.spring.register(SubclassConfig.class).autowire();
-		TestingAuthenticationToken authentication = new TestingAuthenticationToken("principal", "credential",
-				"ROLE_ABC");
+		Authentication authentication = TestAuthentication.authenticatedUser(authorities("ROLE_ABC"));
 		MockMethodInvocation methodInvocation = new MockMethodInvocation(new Foo(), Foo.class, "bar", String.class);
 		EvaluationContext context = this.methodSecurityExpressionHandler.createEvaluationContext(authentication,
 				methodInvocation);
@@ -105,7 +105,7 @@ public void rolePrefixWithGrantedAuthorityDefaultsAndSubclassWithProxyingEnabled
 	public void findByIdWhenAuthorizedResultThenAuthorizes() {
 		this.spring.register(AuthorizeResultConfig.class).autowire();
 		FlightRepository flights = this.spring.getContext().getBean(FlightRepository.class);
-		TestingAuthenticationToken pilot = new TestingAuthenticationToken("user", "pass", "airplane:read");
+		Authentication pilot = TestAuthentication.authenticatedUser(authorities("airplane:read"));
 		StepVerifier
 			.create(flights.findById("1")
 				.flatMap(Flight::getAltitude)
@@ -124,7 +124,7 @@ public void findByIdWhenAuthorizedResultThenAuthorizes() {
 	public void findByIdWhenUnauthorizedResultThenDenies() {
 		this.spring.register(AuthorizeResultConfig.class).autowire();
 		FlightRepository flights = this.spring.getContext().getBean(FlightRepository.class);
-		TestingAuthenticationToken pilot = new TestingAuthenticationToken("user", "pass", "seating:read");
+		Authentication pilot = TestAuthentication.authenticatedUser(authorities("seating:read"));
 		StepVerifier
 			.create(flights.findById("1")
 				.flatMap(Flight::getSeats)
@@ -142,7 +142,7 @@ public void findByIdWhenUnauthorizedResultThenDenies() {
 	public void findAllWhenUnauthorizedResultThenDenies() {
 		this.spring.register(AuthorizeResultConfig.class).autowire();
 		FlightRepository flights = this.spring.getContext().getBean(FlightRepository.class);
-		TestingAuthenticationToken pilot = new TestingAuthenticationToken("user", "pass", "seating:read");
+		Authentication pilot = TestAuthentication.authenticatedUser(authorities("seating:read"));
 		StepVerifier
 			.create(flights.findAll()
 				.flatMap(Flight::getSeats)
@@ -160,7 +160,7 @@ public void findAllWhenUnauthorizedResultThenDenies() {
 	public void removeWhenAuthorizedResultThenRemoves() {
 		this.spring.register(AuthorizeResultConfig.class).autowire();
 		FlightRepository flights = this.spring.getContext().getBean(FlightRepository.class);
-		TestingAuthenticationToken pilot = new TestingAuthenticationToken("user", "pass", "seating:read");
+		Authentication pilot = TestAuthentication.authenticatedUser(authorities("seating:read"));
 		StepVerifier.create(flights.remove("1").contextWrite(ReactiveSecurityContextHolder.withAuthentication(pilot)))
 			.verifyComplete();
 	}
@@ -169,7 +169,7 @@ public void removeWhenAuthorizedResultThenRemoves() {
 	public void findAllWhenPostFilterThenFilters() {
 		this.spring.register(AuthorizeResultConfig.class).autowire();
 		FlightRepository flights = this.spring.getContext().getBean(FlightRepository.class);
-		TestingAuthenticationToken pilot = new TestingAuthenticationToken("user", "pass", "airplane:read");
+		Authentication pilot = TestAuthentication.authenticatedUser(authorities("airplane:read"));
 		StepVerifier
 			.create(flights.findAll()
 				.flatMap(Flight::getPassengers)
@@ -183,7 +183,7 @@ public void findAllWhenPostFilterThenFilters() {
 	public void findAllWhenPreFilterThenFilters() {
 		this.spring.register(AuthorizeResultConfig.class).autowire();
 		FlightRepository flights = this.spring.getContext().getBean(FlightRepository.class);
-		TestingAuthenticationToken pilot = new TestingAuthenticationToken("user", "pass", "airplane:read");
+		Authentication pilot = TestAuthentication.authenticatedUser(authorities("airplane:read"));
 		StepVerifier
 			.create(flights.findAll()
 				.flatMap((flight) -> flight.board(Flux.just("John Doe", "John")).then(Mono.just(flight)))
@@ -198,7 +198,7 @@ public void findAllWhenPreFilterThenFilters() {
 	public void findAllWhenNestedPreAuthorizeThenAuthorizes() {
 		this.spring.register(AuthorizeResultConfig.class).autowire();
 		FlightRepository flights = this.spring.getContext().getBean(FlightRepository.class);
-		TestingAuthenticationToken pilot = new TestingAuthenticationToken("user", "pass", "seating:read");
+		Authentication pilot = TestAuthentication.authenticatedUser(authorities("seating:read"));
 		StepVerifier
 			.create(flights.findAll()
 				.flatMap(Flight::getPassengers)
@@ -207,6 +207,10 @@ public void findAllWhenNestedPreAuthorizeThenAuthorizes() {
 			.verifyError(AccessDeniedException.class);
 	}
 
+	private static Consumer<User.UserBuilder> authorities(String... authorities) {
+		return (builder) -> builder.authorities(authorities);
+	}
+
 	@Configuration
 	@EnableReactiveMethodSecurity // this imports ReactiveMethodSecurityConfiguration
 	static class WithRolePrefixConfiguration {
diff --git a/core/src/test/java/org/springframework/security/authentication/TestAuthentication.java b/core/src/test/java/org/springframework/security/authentication/TestAuthentication.java
index 51c81e9626c..41cfcdf4ebd 100644
--- a/core/src/test/java/org/springframework/security/authentication/TestAuthentication.java
+++ b/core/src/test/java/org/springframework/security/authentication/TestAuthentication.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,9 +16,12 @@
 
 package org.springframework.security.authentication;
 
+import java.util.function.Consumer;
+
 import org.springframework.security.core.Authentication;
 import org.springframework.security.core.authority.AuthorityUtils;
 import org.springframework.security.core.userdetails.PasswordEncodedUser;
+import org.springframework.security.core.userdetails.User;
 import org.springframework.security.core.userdetails.UserDetails;
 
 /**
@@ -42,6 +45,12 @@ public static Authentication authenticatedUser() {
 		return authenticated(user());
 	}
 
+	public static Authentication authenticatedUser(Consumer<User.UserBuilder> consumer) {
+		User.UserBuilder builder = withUsername("user");
+		consumer.accept(builder);
+		return authenticated(builder.build());
+	}
+
 	public static Authentication authenticated(UserDetails user) {
 		return UsernamePasswordAuthenticationToken.authenticated(user, null, user.getAuthorities());
 	}