Polish "Do not auto-configure ViewResolver if spring-webmvc is absent"

See gh-44259

Author: snicoll

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/thymeleaf/ThymeleafServletAutoConfigurationTests.java

@@ -46,7 +46,6 @@
 import org.springframework.boot.test.system.CapturedOutput;
 import org.springframework.boot.test.system.OutputCaptureExtension;
 import org.springframework.boot.testsupport.BuildOutput;
-import org.springframework.boot.testsupport.classpath.ClassPathExclusions;
 import org.springframework.boot.web.servlet.FilterRegistrationBean;
 import org.springframework.boot.web.servlet.filter.OrderedCharacterEncodingFilter;
 import org.springframework.context.annotation.Bean;
@@ -61,6 +60,7 @@
 import org.springframework.web.servlet.ViewResolver;
 import org.springframework.web.servlet.resource.ResourceUrlEncodingFilter;
 import org.springframework.web.servlet.support.RequestContext;
+import org.springframework.web.servlet.view.AbstractCachingViewResolver;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -338,9 +338,8 @@ void cachingCanBeDisabled() {
 	}
 
 	@Test
-	@ClassPathExclusions("spring-webmvc-*.jar")
 	void missingAbstractCachingViewResolver() {
-		this.contextRunner
+		this.contextRunner.withClassLoader(new FilteredClassLoader(AbstractCachingViewResolver.class))
 			.run((context) -> assertThat(context).hasNotFailed().doesNotHaveBean("thymeleafViewResolver"));
 	}