nose执行顺序

nose单元测试执行顺序

nose和unittest一样，都可以在用例中指定setUp()和tearDown()（用户测试初始化以及测试结束后的操作），在nose中，package、module、class都可以设置setup()和teardown()；

package中设置

在package中设置，整个测试的运行期间只会执行一次（新建python package时，会生成一个init.py文件，在其中设置setUp()以及tearDown()即可）

用例中每次都执行setup及teardown

在模块、类中执行顺序示例：
新建Testexec.py文件，内容：

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
@author: kyle
@time: 2018/2/7 10:39
"""
from nose.plugins.skip import SkipTest


class TestClass():

    def setUp(self):
        print("=============-My Testcase is setup-===========")

    def tearDown(self):
        print("============My Testcase is teardown===========")

    def test_fun1(self):
        print("This is test_fun1*******")
        pass

    def test_fun2(self):
        print("This is test_fun2=====")
        pass

    def test_fun3(self):
        print("This is test_fun3~~~~~~~~~")
        raise SkipTest

    def test_Fun1(self):
        print("This is test_Fun1***====***")
        pass

命令行执行nosetests：

nosetests -v -s Testexec.py

执行结果：

{lamb} nosetests -v -s Testexec.py                                               
Testexec.TestClass.test_Fun1 ... =============-My Testcase is setup-===========  
This is test_Fun1***====***                                                      
============My Testcase is teardown===========                                   
ok                                                                               
Testexec.TestClass.test_fun1 ... =============-My Testcase is setup-===========  
This is test_fun1*******                                                         
============My Testcase is teardown===========                                   
ok                                                                               
Testexec.TestClass.test_fun2 ... =============-My Testcase is setup-===========  
This is test_fun2=====                                                           
============My Testcase is teardown===========                                   
ok                                                                               
Testexec.TestClass.test_fun3 ... =============-My Testcase is setup-===========  
This is test_fun3~~~~~~~~~                                                       
============My Testcase is teardown===========                                   
SKIP                                                                             
                                                                                 
----------------------------------------------------------------------           
Ran 4 tests in 0.005s                                                            
                                                                                 
OK (SKIP=1)                                                                      

可以看见在对每一个函数进行测试时，都执行了一次setUp()以及tearDown()；且用例执行顺序是：

test_Fun1 -> test_fun1 -> test_fun2 -> test_fun3

其中test_fun3跳过了测试，执行顺序是按照先大写字母，再小写字母，然后再按阿拉伯数字排列的。

用例中只执行一次setup及teardown

只需要在setUpClass()及tearDownClass()前加修饰器@classmethod即可：

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
@author: kyle
@time: 2018/2/7 10:39
"""
from nose.plugins.skip import SkipTest


class TestClass():

    @classmethod
    def setUpClass(cls):
        print("只初始化一次setup=======")

    @classmethod
    def tearDownClass(cls):
        print("只teardown一次***********")

    def setUp(self):
        print("=============-My Testcase is setup-===========")

    def tearDown(self):
        print("============My Testcase is teardown===========")

    def test_fun1(self):
        print("This is test_fun1*******")
        pass

    def test_fun2(self):
        print("This is test_fun2=====")
        pass

    def test_fun3(self):
        print("This is test_fun3~~~~~~~~~")
        raise SkipTest

    def test_Fun1(self):
        print("This is test_Fun1***====***")
        pass

执行测试：

nosetests -v -s Testexec.py

执行结果：

{lamb} nosetests -v -s Testexec.py                                                   
只初始化一次setup=======                                                                   
Testexec.TestClass.test_Fun1 ... =============-My Testcase is setup-===========      
This is test_Fun1***====***                                                          
============My Testcase is teardown===========                                       
ok                                                                                   
Testexec.TestClass.test_fun1 ... =============-My Testcase is setup-===========      
This is test_fun1*******                                                             
============My Testcase is teardown===========                                       
ok                                                                                   
Testexec.TestClass.test_fun2 ... =============-My Testcase is setup-===========      
This is test_fun2=====                                                               
============My Testcase is teardown===========                                       
ok                                                                                   
Testexec.TestClass.test_fun3 ... =============-My Testcase is setup-===========      
This is test_fun3~~~~~~~~~                                                           
============My Testcase is teardown===========                                       
SKIP                                                                                 
只teardown一次***********                                                               
                                                                                     
----------------------------------------------------------------------               
Ran 4 tests in 0.006s                                                                
                                                                                     
OK (SKIP=1)                                                                          

可以看见，setUpClass()以及tearDownClass都只执行了一次。在自动化测试中，可用来加载配置信息，只需要加载一次即可。