import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
....

@SpringBootTest
@RunWith(SpringRunner.class)
public class xxx{
    @Before
    public void setUp() throws Exception{
        ...
    }
}

import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.TestInstance;
import org.junit.jupiter.api.extension.ExtendWith;
....

@SpringBootTest
@ExtendWith(SpringExtension.class)
@TestInstance(TestInstance.Lifecycle.PER_CLASS)
public class xxx{
    @BeforeAll
    public void setUp() throws Exception{
        ...
    }
}