導讀

不同scope含義

• session
• module
• class
• function

程式碼說明

（借用了參考文章中的程式碼）

conftest.py:

import pytest

@pytest.fixture(scope="session")
def resource_a(request):
    print('In resource_a()')

    def resource_a_fin():
            print('\nIn resource_a_fin()')
    request.addfinalizer(resource_a_fin)

@pytest.fixture(scope="module")
def resource_b
 
(request, resource_a):
    print('In resource_b()')

    def resource_b_fin():
            print('\nIn resource_b_fin()')
    request.addfinalizer(resource_b_fin)

@pytest.fixture(scope="function")
def resource_c(request, resource_b):
    print('In resource_c()')

    def resource_c_fin():
            print('\nIn resource_c_fin()'
 
)
    request.addfinalizer(resource_c_fin)


# these are just some fun dividiers to make the output pretty
# completely unnecessary, I was just playing with autouse fixtures
@pytest.fixture(scope="function", autouse=True)
def divider_function(request):
    print('\n        --- function %s() start ---' % request.function.__name__)
    def fin():
            print('        --- function %s() done ---' % request.function.__name__)
    request.addfinalizer(fin)

@pytest.fixture(scope="module", autouse=True)
def divider_module(request):
    print('\n    ------- module %s start ---------' % request.module.__name__)
    def fin():
            print('    ------- module %s done ---------' % request.module.__name__)
    request.addfinalizer(fin)

@pytest.fixture(scope="session", autouse=True)
def divider_session(request):
    print('\n----------- session start ---------------')
    def fin():
            print('----------- session done ---------------')
    request.addfinalizer(fin)

test_one_two.py:

def test_one(resource_c):
    print('In test_one()')

def test_two(resource_c):
    print('\nIn test_two()')

test_three_four.py:

def test_three(resource_c):
    print('\nIn test_three()')

def test_four(resource_c):
    print('\nIn test_four()')

output:

$ py.test -s -v
==================================== test session starts ====================================
platform darwin -- Python 2.7.5 -- py-1.4.20 -- pytest-2.5.2 -- /usr/bin/python
collected 4 items 

test_one_two.py:1: test_one 
----------- session start ---------------

    ------- module test_one_two start ---------

        --- function test_one() start ---
In resource_a()
In resource_b()
In resource_c()
In test_one()
PASSED
In resource_c_fin()
        --- function test_one() done ---

test_one_two.py:4: test_two 
        --- function test_two() start ---
In resource_c()

In test_two()
PASSED
In resource_c_fin()
        --- function test_two() done ---

In resource_b_fin()
    ------- module test_one_two done ---------

test_three_four.py:1: test_three 
    ------- module test_three_four start ---------

        --- function test_three() start ---
In resource_b()
In resource_c()

In test_three()
PASSED
In resource_c_fin()
        --- function test_three() done ---

test_three_four.py:4: test_four 
        --- function test_four() start ---
In resource_c()

In test_four()
PASSED
In resource_c_fin()
        --- function test_four() done ---

In resource_b_fin()
    ------- module test_three_four done ---------

In resource_a_fin()
----------- session done ---------------


================================= 4 passed in 0.02 seconds ==================================

在這次執行中一種有4個case,屬於同一個session，兩個module，4個function，如下表所示

test_one執行時，session開始，test_one_two.py這個module開始，test_one function開始，test_two執行完成時，function和module範圍結束，而直到test_four執行結束時，session才結束。