diff --git a/spring-webflux/src/test/java/org/springframework/web/reactive/DispatcherHandlerErrorTests.java b/spring-webflux/src/test/java/org/springframework/web/reactive/DispatcherHandlerErrorTests.java
index 42a85569893..24c123dd29f 100644
--- a/spring-webflux/src/test/java/org/springframework/web/reactive/DispatcherHandlerErrorTests.java
+++ b/spring-webflux/src/test/java/org/springframework/web/reactive/DispatcherHandlerErrorTests.java
@@ -88,7 +88,8 @@ public class DispatcherHandlerErrorTests {
 		StepVerifier.create(publisher)
 				.consumeErrorWith(error -> {
 					assertThat(error, instanceOf(ResponseStatusException.class));
-					assertThat(error.getMessage(), is("Response status 404 with reason \"No matching handler\""));
+					assertThat(error.getMessage(),
+							is("Response status 404 NOT_FOUND with reason \"No matching handler\""));
 				})
 				.verify();
 	}
diff --git a/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/InvocableHandlerMethodTests.java b/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/InvocableHandlerMethodTests.java
index 41204f70b50..b74fdcd2ab5 100644
--- a/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/InvocableHandlerMethodTests.java
+++ b/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/InvocableHandlerMethodTests.java
@@ -176,7 +176,7 @@ public class InvocableHandlerMethodTests {
 			fail("Expected UnsupportedMediaTypeStatusException");
 		}
 		catch (UnsupportedMediaTypeStatusException ex) {
-			assertThat(ex.getMessage(), is("Response status 415 with reason \"boo\""));
+			assertThat(ex.getMessage(), is("Response status 415 UNSUPPORTED_MEDIA_TYPE with reason \"boo\""));
 		}
 	}
 
diff --git a/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/RequestMappingInfoHandlerMappingTests.java b/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/RequestMappingInfoHandlerMappingTests.java
index af1f5443ee9..330274c64f7 100644
--- a/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/RequestMappingInfoHandlerMappingTests.java
+++ b/spring-webflux/src/test/java/org/springframework/web/reactive/result/method/RequestMappingInfoHandlerMappingTests.java
@@ -170,8 +170,8 @@ public class RequestMappingInfoHandlerMappingTests {
 		Mono<Object> mono = this.handlerMapping.getHandler(exchange);
 
 		assertError(mono, UnsupportedMediaTypeStatusException.class,
-				ex -> assertEquals("Response status 415 with reason \"Invalid mime type \"bogus\": " +
-								"does not contain '/'\"", ex.getMessage()));
+				ex -> assertEquals("Response status 415 UNSUPPORTED_MEDIA_TYPE with reason " +
+						"\"Invalid mime type \"bogus\": does not contain '/'\"", ex.getMessage()));
 	}
 
 	@Test  // SPR-8462