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On 3/26/2012 8:28 AM, Staple, Danny (BSKYB) wrote:
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hmm
– I am thinking that a python dsl similar to JS’s Jasmine
with matchers would be doable.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">with
describe(“foo”):<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">
It(“should throw bar”):<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">
expect( lambda : foo.doStuff()).toRaise(BarException);<o:p></o:p></span></p>
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</blockquote>
I've never seen the value in ladling English all over my test
cases. How is your code better than what you can currently do with
unittest?:<br>
<br>
def test_should_throw_bar(self):<br>
"""foo should throw bar"""<br>
with self.assertRaises(BarException):<br>
foo.doStuff()<br>
<br>
Not to mention, the snippet you presented isn't valid Python, yet
involves a lambda...<br>
<br>
--Ned.<br>
<br>
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cite="mid:DAC86F5F3B84F14088F0DB16092558CA17EF87E972@UKMA1.UK.NDS.COM"
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">There
definitely are many python test things other than doctest
and unittest (Freshen, Lettuce, PySpec, spec plugin for
nose, should-dsl for some). The trick to acceptance is
compatibility probably, make sure that there is a nose
plugin, that it works with Micheal Foord’s mock, that
doesn’t do such strange magic that it taints the global
namespace and makes stuff behave incorrectly.
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif""
lang="EN-US">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif""
lang="EN-US"> <a class="moz-txt-link-abbreviated" href="mailto:testing-in-python-bounces@lists.idyll.org">testing-in-python-bounces@lists.idyll.org</a>
[<a class="moz-txt-link-freetext" href="mailto:testing-in-python-bounces@lists.idyll.org">mailto:testing-in-python-bounces@lists.idyll.org</a>]
<b>On Behalf Of </b>Alfredo Deza<br>
<b>Sent:</b> 26 March 2012 12:08<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:Chris.Wesseling@cwi.nl">Chris.Wesseling@cwi.nl</a><br>
<b>Cc:</b> John MacKenzie; <a class="moz-txt-link-abbreviated" href="mailto:testing-in-python@lists.idyll.org">testing-in-python@lists.idyll.org</a><br>
<b>Subject:</b> Re: [TIP] Sclara is a Python testing DSL<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
<div>
<p class="MsoNormal">On Mon, Mar 26, 2012 at 3:56 AM, <<a
moz-do-not-send="true"
href="mailto:Chris.Wesseling@cwi.nl">Chris.Wesseling@cwi.nl</a>>
wrote:<o:p></o:p></p>
<p class="MsoNormal">On 2012-03-24T16:00:06-0500, John
MacKenzie wrote:<br>
> <a moz-do-not-send="true"
href="http://github.com/198d/sclara" target="_blank">http://github.com/198d/sclara</a><br>
[...]<o:p></o:p></p>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt">> There
are failures in both as a demonstration of how this
interacts with a<br>
> TestRunner. The first one proves mainly that this is
just Python; if you<br>
> use one of the provided runners you can execute your
test files with the<br>
> Python interpreter (a big goal after looking at a
tool like komira for this<br>
> sort of thing). The latter demonstrates that a nose
plugin is possible and<br>
> probably implies that a py.test plugin is doable to.<o:p></o:p></p>
</div>
<p class="MsoNormal">Could you point me to "komira"? Your
e-mail turns up as the only<br>
relevant hit using my search-fu.<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Konira is a Testing DSL framework [0]
that I started working on about a year and a half ago. It<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">is not valid Python (hence the DSL
connotation) but it is translated to it when tests are run<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">via de included Test Runner or with the
py.test [1] plugin for it.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">The problem that I see these solutions
(including Konira) bring to the table is that they all try
to<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">create a flexible, descriptive and
terse domain for writing tests, and while some of them
have a <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">significant gain over current testing
standards, they fail when the complexity goes beyond <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">asserting something that has a nice
description.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">It might be heretic to raise this in a
testing list for Python, but I also believe that the
Python community<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">is not as pro-innovation in the testing
environment as other communities are, which is detrimental
to the fact<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">that there are a few people who don't
like the standard testing framework and are looking
forwards to an<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">alternative.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
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<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
> Beyond sclara, I'm considering the idea that, more
than a testing<br>
> framework, I stumbled on an interesting pattern for
building generic DSLs<br>
> in Python (more on this soon, hopefully).<br>
><br>
> Thoughts?<o:p></o:p></p>
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt">I started
reading the tests, to see if the DSL provides the clarity
we need in<br>
this domain:<br>
<br>
examples/test_sclara.py line 14:<br>
<br>
with test('does not have access to inner setup
context') as context:<br>
try:<br>
context.bar<br>
except AttributeError:<br>
pass<br>
<br>
<br>
Will this fail if no AttributeError is thrown?<br>
<br>
And line 45:<br>
<br>
with test('has access to inner setup context') as
context:<br>
assert context.foo == 'bar'<br>
<br>
with test('has access to outer setup context') as
context:<br>
assert context.bar == 'foo'<br>
<br>
Shouldn't "inner" and "outer" be swapped here?<br>
The outer setup adds foo and baz attributes.<br>
The inner setup adds the bar attribute to the context and
changes the baz value.<br>
<br>
<br>
What I see as a pitfall for users with this idiom, is that
it might invite to<br>
breaking isolation.<br>
<br>
Interesting, though.<o:p></o:p></p>
</blockquote>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">[0] <a moz-do-not-send="true"
href="http://konira.cafepais.com/docs/index.html">http://konira.cafepais.com/docs/index.html</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">[1] <a moz-do-not-send="true"
href="http://pypi.python.org/pypi/pytest-konira">http://pypi.python.org/pypi/pytest-konira</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span
class="hoenzb"><span style="color:#888888">--</span></span><span
style="color:#888888"><br>
<span class="hoenzb">Chris Wesseling</span><br>
<span class="hoenzb">Centrum Wiskunde & Informatica
(CWI)</span><br>
<span class="hoenzb"><a moz-do-not-send="true"
href="https://www.cwi.nl/people/ccw" target="_blank">https://www.cwi.nl/people/ccw</a></span><br>
</span><br>
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