pytest文档26-运行上次失败用例(--lf 和 --ff）

前言

“80%的bug集中在20%的模块，越是容易出现bug的模块，bug是越改越多“平常我们做手工测试的时候，比如用100个用例需要执行，其中10个用例失败了，
当开发修复完bug后，我们一般是重点测上次失败的用例。
那么自动化测试也一样，当用例特别多时，为了节省时间，第一次部分用例失败了，修复完之后，可以只测上次失败的用例。

pytest -h

命令行输入pytest -h，找到里面两个命令行参数： --lf 和 --ff

• --lf, --last-failed 只重新运行上次运行失败的用例（或如果没有失败的话会全部跑）
• --ff, --failed-first 运行所有测试，但首先运行上次运行失败的测试（这可能会重新测试，从而导致重复的fixture setup/teardown）

--lf 和 --ff

lf是last-failed的缩写，我第一次运行全部测试用例有4个通过passed， 2个失败failed，1个error

E:\YOYO\web_conf_py>pytest
============================= test session starts =============================
platform win32 -- Python 3.6.0, pytest-3.6.3, py-1.5.4, pluggy-0.6.0
rootdir: E:\YOYO\web_conf_py, inifile:
plugins: metadata-1.7.0, html-1.19.0
collected 7 items

baidu\test_1_baidu.py ..                                                 [ 28%]
baidu\test_2.py FF                                                       [ 57%]
blog\test_2_blog.py ..E                                                  [100%]

=================================== ERRORS ====================================
__________________________ ERROR at setup of test_05 __________________________
file E:\YOYO\web_conf_py\blog\test_2_blog.py, line 11
  def test_05(start, open_baidu):
E       fixture 'open_baidu' not found
>       available fixtures: cache, capfd, capfdbinary, caplog, capsys, capsysbinary, doctest_namespace, metadata, monkeypatch, open_blog, pytestconfig, record_property, record_xml_attribute, record_xml_property, recwarn, start, tmpdir, tmpdir_factory
>       use 'pytest --fixtures [testpath]' for help on them.

E:\YOYO\web_conf_py\blog\test_2_blog.py:11
================================== FAILURES ===================================
___________________________________ test_06 ___________________________________

start = None, open_baidu = None

    def test_06(start, open_baidu):
        print("测试用例test_01")
>       assert 1==2
E       assert 1 == 2

baidu\test_2.py:5: AssertionError
---------------------------- Captured stdout call -----------------------------
测试用例test_01
___________________________________ test_07 ___________________________________

start = None, open_baidu = None

    def test_07(start, open_baidu):
        print("测试用例test_02")
>       assert 1==2
E       assert 1 == 2

baidu\test_2.py:9: AssertionError
---------------------------- Captured stdout call -----------------------------
测试用例test_02
================= 2 failed, 4 passed, 1 error in 0.21 seconds =================

如果只想运行其中2个failed的和1error用例，那么可以直接在cmd输入指令

pytest --lf

E:\YOYO\web_conf_py>pytest --lf
============================= test session starts =============================
platform win32 -- Python 3.6.0, pytest-3.6.3, py-1.5.4, pluggy-0.6.0
rootdir: E:\YOYO\web_conf_py, inifile:
plugins: metadata-1.7.0, html-1.19.0
collected 7 items / 4 deselected
run-last-failure: rerun previous 3 failures

baidu\test_2.py FF                                                       [ 66%]
blog\test_2_blog.py E                                                    [100%]

========================== 2 failed, 4 deselected, 1 error in 0.16 seconds===========================

如果想先运行上次失败的，后运行其它通过的用例

pytest --ff

E:\YOYO\web_conf_py>pytest --ff
============================= test session starts =============================
platform win32 -- Python 3.6.0, pytest-3.6.3, py-1.5.4, pluggy-0.6.0
rootdir: E:\YOYO\web_conf_py, inifile:
plugins: metadata-1.7.0, html-1.19.0
collected 7 items
run-last-failure: rerun previous 3 failures first

baidu\test_2.py FF                                                       [ 28%]
blog\test_2_blog.py E                                                    [ 42%]
baidu\test_1_baidu.py ..                                                 [ 71%]
blog\test_2_blog.py ..                                                   [100%]

================= 2 failed, 4 passed, 1 error in 0.14 seconds =================

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