Error creating bean with name 'org.springframework.web.servlet.resource.ResourceHttpRequestHandler#0':

ERROR

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.resource.ResourceHttpRequestHandler#0': Invocation of init method failed; nested exception is java.lang.IllegalStateException: WebApplicationObjectSupport instance [ResourceHttpRequestHandler [locations=[class path resource [resources/]], resolvers=[org.springframework.web.servlet.resource.PathResourceResolver@2c6aed22]]] does not run in a WebApplicationContext but in: org.springframework.context.support.GenericApplicationContext@11fc564b: startup date [Sun Apr 09 17:53:48 KST 2023]; root of context hierarchy
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1634)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:312)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:308)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543)
	at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:128)
	at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:60)
	at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.delegateLoading(AbstractDelegatingSmartContextLoader.java:106)
	at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.loadContext(AbstractDelegatingSmartContextLoader.java:249)
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98)
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116)
	... 25 more

Junit 테스트를 할 때 에러가 발생했다.
Junit 클래스 위에 @WebAppConfiguration 추가해주면 해결된다.

참고 : https://codingwanee.tistory.com/entry/%EB%94%94%EB%B2%84%EA%B7%B8-Spring-jUnit-%EC%8A%A4%ED%94%84%EB%A7%81-%EC%A0%9C%EC%9D%B4%EC%9C%A0%EB%8B%9B-%ED%85%8C%EC%8A%A4%ED%8A%B8%EC%97%90%EC%84%9C-javalangIllegalStateException-Failed-to-load-ApplicationContext