Path: csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail
From: Terry Reedy <tjreedy@udel.edu>
Newsgroups: comp.lang.python
Subject: Re: Question on pytest example code
Date: Sun, 10 Jan 2016 23:00:47 -0500
Lines: 36
Message-ID: <mailman.4.1452484871.13488.python-list@python.org>
References: <1c9f8fb6-b903-4204-86f6-9d8c81e69acd@googlegroups.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
X-Trace: news.uni-berlin.de KJM5hvJ3nu8cgJf0uuG5NgLJvpRHNhsWWu8enWS9R9eQ==
Return-Path: <python-python-list@m.gmane.org>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.000
X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'context': 0.05; 'subject:Question': 0.05; 'raises': 0.07; 'report.': 0.07; 'subject:code': 0.07; 'unittest': 0.07; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'snippet': 0.09; 'jan': 0.11; 'exception': 0.13; 'def': 0.13; 'presume': 0.16; 'pytest': 0.16; 'pytest,': 0.16; 'received:80.91.229.3': 0.16; 'received:io': 0.16; 'received:plane.gmane.org': 0.16; 'received:psf.io': 0.16; 'reedy': 0.16; 'wrote:': 0.16; 'passes': 0.18; 'tests': 0.18; 'latter': 0.22; 'import': 0.24; 'header:In-Reply-To:1': 0.24; 'header:User-Agent:1': 0.26; 'header:X-Complaints-To:1': 0.26; 'not.': 0.27; 'package.': 0.27; 'function': 0.28; "skip:' 10": 0.28; 'raise': 0.29; 'code': 0.30; 'checks': 0.30; "skip:' 20": 0.34; 'i.e.': 0.35; 'robert': 0.35; 'there': 0.36; 'received:71': 0.36; 'to:addr:python-list': 0.36; 'pm,': 0.36; 'subject:: ': 0.37; 'method': 0.37; 'received:org': 0.37; 'missing': 0.37; 'release': 0.37; 'version': 0.38; 'skip:p 20': 0.38; 'hi,': 0.38; 'does': 0.39; 'to:addr:python.org': 0.40; 'some': 0.40; 'more': 0.63; 'received:fios.verizon.net': 0.91
X-Injected-Via-Gmane: http://gmane.org/
X-Gmane-NNTP-Posting-Host: pool-71-185-227-36.phlapa.fios.verizon.net
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.5.1
In-Reply-To: <1c9f8fb6-b903-4204-86f6-9d8c81e69acd@googlegroups.com>
X-BeenThere: python-list@python.org
X-Mailman-Version: 2.1.20+
Precedence: list
List-Id: General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe: <https://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive: <http://mail.python.org/pipermail/python-list/>
List-Post: <mailto:python-list@python.org>
List-Help: <mailto:python-list-request@python.org?subject=help>
List-Subscribe: <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Xref: csiph.com comp.lang.python:101461

On 1/10/2016 2:38 PM, Robert wrote:
> Hi,
>
> Below is a code snippet from pytest package. It passes pytest, i.e. there is
> no failure report.
>
>
> # content of test_sysexit.py
> import pytest
>
> def f():
>       raise SystemExit(1)
>
> def test_mytest():
>       with pytest.raises(SystemExit):
>            f()
>
>
> I see that f() will generate 'SystemExit(1)'. Then what does function
> test_mytest()?

What does test_mytest do? It tests that f() raises SystemExit.

> Is it missing some assert line?

The unittest version of 'pytest.raises' is 'self.assertRaises'.  The 
latter context manager __exit__ method checks that it is passed the 
exception given to the __enter__ method and fails if not.  I presume the 
pytest version is more or less identical.

> The above code is from page 5 (9 of 93) of 'pytest Documentation'
> Release 2.8.2

-- 
Terry Jan Reedy