Relax test assertion when Jacoco is enabled

This commit changes the resolveMethod to take a method name as
instrumentation may add additional methods to the test object.

Issue: SPR-15888

Author: snicoll

spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/ResponseBodyResultHandlerTests.java

@@ -83,7 +83,7 @@ public void supports() throws NoSuchMethodException {
 		method = on(TestController.class).annotPresent(ResponseBody.class).resolveMethod();
 		testSupports(controller, method);
 
-		method = on(TestController.class).annotNotPresent(ResponseBody.class).resolveMethod();
+		method = on(TestController.class).annotNotPresent(ResponseBody.class).resolveMethod("doWork");
 		HandlerResult handlerResult = getHandlerResult(controller, method);
 		assertFalse(this.resultHandler.supports(handlerResult));
 	}