IDEA springboot项目test类报错:Cannot resolve symbol ‘SpringJUnit4ClassRunner‘

ps:idea打开之后,发现test类报错:Cannot resolve symbol ‘SpringJUnit4ClassRunner’,注解全部爆红. test类部分截图: import com.fasterxml.jackson.databind.ObjectMapper; import org.junit.Before; import org.junit.Test; import org.
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