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Question on pytest example code

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  Question on pytest example code Robert <rxjwg98@gmail.com> - 2016-01-10 11:38 -0800
    Re: Question on pytest example code Terry Reedy <tjreedy@udel.edu> - 2016-01-10 23:00 -0500

#101447 — Question on pytest example code

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()?

Is it missing some assert line?
The above code is from page 5 (9 of 93) of 'pytest Documentation' 
Release 2.8.2

Thanks,

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#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

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