@BeforeEach
    public void setUp() {
        polarisConfig = new PolarisConfig();
        polarisConfig.setUrl(URL);
        polarisConfig.setNamespace(NAMESPACE);
        polarisConfig.setFileGroup(FILEGROUP);

        that = new PolarisConfig();
        that.setUrl(URL);
        that.setNamespace(NAMESPACE);
        that.setFileGroup(FILEGROUP);
    }
add test case for {@link PolarisConfig}.
shenyu-sync-data-center/shenyu-sync-data-polaris/src/test/java/org/apache/shenyu/sync/data/polaris/config/PolarisConfigTest.java