### Question:
UserServiceImpl implements UserService { @Override public String selectRoleNameByUserName(String username) { return userExt.selectRoleNameByUserName(username); }  @Override List<TPermission> selectAll(); @Override TUser selectUserByUserName(String username); @Override String selectRoleNameByUserName(String username); @Override List<String> selectPermissionsByRoleName(String roleName); @Override int userRegister(TUser user);  }### Answer:
@Test public void selectRoleNameByUserName() { log.info(userService.selectRoleNameByUserName("user")); }