### Question:
DepartmentManagementImpl implements DepartmentManagementService { @Override public CommonResult getDepartmentById(Integer id) { Department department = departmentMapper.get(id); return CommonResult.success(department); }  @Override CommonResult getDepartmentById(Integer id); @Override CommonResult insertDepartment(Department department); @Override CommonResult updateDepartmentById(Department department); @Override CommonResult deleteDepartmentById(Integer id); @Override CommonResult listAllDepartments(); @Override CommonResult listPage(Integer pageNum, Integer pageSize); @Override CommonResult listDepartmentsTree(); CommonResult listDoctorDepartments();  }### Answer:
@Test public void testGetDepartmentById() throws Exception { }