Re: Question on pytest example code

[Terry Reedy]

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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