IllegalStateException

CoreApplicationTests를 run 했을 때 아래와 같은 에러가 발생합니다. 라이브 코딩으로 똑같이 따라했는데 왜 그러는걸까요? ㅠㅠ 구글 드라이브 링크 첨부합니다... 도와주세요 ㅠ

java.lang.IllegalStateException: Failed to load ApplicationContext for [MergedContextConfiguration@298d9a05 testClass = hello.core.CoreApplicationTests, locations = [], classes = [hello.core.CoreApplication], contextInitializerClasses = [], activeProfiles = [], propertySourceDescriptors = [], propertySourceProperties = ["org.springframework.boot.test.context.SpringBootTestContextBootstrapper=true"], contextCustomizers = [org.springframework.boot.test.autoconfigure.actuate.observability.ObservabilityContextCustomizerFactory$DisableObservabilityContextCustomizer@1f, org.springframework.boot.test.autoconfigure.properties.PropertyMappingContextCustomizer@0, org.springframework.boot.test.autoconfigure.web.servlet.WebDriverContextCustomizer@4ef37659, org.springframework.boot.test.context.filter.ExcludeFilterContextCustomizer@306cf3ea, org.springframework.boot.test.json.DuplicateJsonObjectContextCustomizerFactory$DuplicateJsonObjectContextCustomizer@52102734, org.springframework.boot.test.mock.mockito.MockitoContextCustomizer@0, org.springframework.boot.test.web.client.TestRestTemplateContextCustomizer@4d910fd6, org.springframework.boot.test.context.SpringBootTestAnnotation@e50e93c5], contextLoader = org.springframework.boot.test.context.SpringBootContextLoader, parent = null]

구글 드라이브 링크 : https://drive.google.com/drive/folders/1KhcvynthGyhTtm1G1hGlFdkD7R1eHDBN?usp=sharing