[JUnit] @Rule TemporaryFolder 사용하기

public class DBUnitSupportTest {
   
    DBUnitSupport dbUnitSupport;

    @Rule public TemporaryFolder folder = new TemporaryFolder();
    @Autowired DataSource dataSource;
    File tempFile;
   
    @Before
    public void setUp() throws Exception{
        dbUnitSupport = new DBUnitSupport(dataSource);
    }
   
    @Test
    public void exportXls() throws Exception {
        tempFile = folder.newFile("temp.xls");
        dbUnitSupport.setExportedFile(tempFile);
        assertThat(tempFile.length(), is(0L));
        dbUnitSupport.exportXlsFrom("code", "item", "users", "role", "users_role");
        assertThat(tempFile.length(), not(0L));
    }
   
    @After
    public void after(){
        assertFalse(tempFile.exists());
    }