diff --git a/oauth2/oauth2-client/src/test/java/org/springframework/security/oauth2/client/registration/ClientRegistrationsTests.java b/oauth2/oauth2-client/src/test/java/org/springframework/security/oauth2/client/registration/ClientRegistrationsTests.java
index 62954a2599..7e59d2595b 100644
--- a/oauth2/oauth2-client/src/test/java/org/springframework/security/oauth2/client/registration/ClientRegistrationsTests.java
+++ b/oauth2/oauth2-client/src/test/java/org/springframework/security/oauth2/client/registration/ClientRegistrationsTests.java
@@ -471,15 +471,11 @@ public class ClientRegistrationsTests {
 				return new MockResponse().setResponseCode(responseCode);
 			}
 		});
-		String message = """
-				Unable to resolve Configuration with the provided Issuer of "%s", errors: [\
-				405 Client Error: [no body], \
-				400 Client Error: [no body], \
-				404 Client Error: [no body]]\
-				""".formatted(this.issuer);
 		assertThatExceptionOfType(IllegalArgumentException.class)
 			.isThrownBy(() -> ClientRegistrations.fromIssuerLocation(this.issuer).build())
-			.withMessage(message);
+			.withMessageContaining("405")
+			.withMessageContaining("400")
+			.withMessageContaining("404");
 	}
 
 	private ClientRegistration.Builder registration(String path) throws Exception {