public static DataPermission get() {
        return DATA_PERMISSIONS.get().peekLast();
    }
@Test
    public void testGet() {
        // mock 方法
        DataPermission dataPermission01 = mock(DataPermission.class);
        DataPermissionContextHolder.add(dataPermission01);
        DataPermission dataPermission02 = mock(DataPermission.class);
        DataPermissionContextHolder.add(dataPermission02);

        // 调用
        DataPermission result = DataPermissionContextHolder.get();
        // 断言
        assertSame(result, dataPermission02);
    }