怎样调试OpenStack Unit Test

相信大家都知道执行OpenStack的Unit Test，非常简单，只需要执行"run_tests.sh"就可以，但是有没有想过怎么 去调试这些Unit Test脚本呢，有个方法是使用"nosetests"，具体如下：

1)修改你要调试的文件，加上"pdb.set_trace()",我现在用test_scheduler.py举例

class SchedulerDriverModuleTestCase(test.TestCase):
    """Test case for scheduler driver module methods."""
 
    def setUp(self):
        super(SchedulerDriverModuleTestCase, self).setUp()
        self.context = context.RequestContext('fake_user', 'fake_project')
 
    def test_encode_instance(self):
        instance = {'id': 31337,
                    'test_arg': 'meow'}
 
        import pdb
        pdb.set_trace()
        result = driver.encode_instance(instance, True)
        expected = {'id': instance['id'], '_is_precooked': False}
        self.assertThat(result, matchers.DictMatches(expected))
        # Orig dict not changed
        self.assertNotEqual(result, instance)
 
        result = driver.encode_instance(instance, False)
        expected = {}
        expected.update(instance)
        expected['_is_precooked'] = True
        self.assertThat(result, matchers.DictMatches(expected))
        # Orig dict not changed
        self.assertNotEqual(result, instance)

2) 执行“nosetests nova/tests/scheduler/test_scheduler.py -s”

root@devstack:~/src/nova-ce/nova-1/nova# nosetests nova/tests/scheduler/test_scheduler.py -s
...................> /root/src/nova-ce/nova-1/nova/nova/tests/scheduler/test_scheduler.py(968)test_encode_instance()
-> result = driver.encode_instance(instance, True)
(Pdb) p instance
{'test_arg': 'meow', 'id': 31337}
(Pdb) n
> /root/src/nova-ce/nova-1/nova/nova/tests/scheduler/test_scheduler.py(969)test_encode_instance()
-> expected = {'id': instance['id'], '_is_precooked': False}
(Pdb) 

OK，停下来了，现在可以调试了。