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POGood Practice for reusing unit test on different functions in Python
 

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  1. POGood Practice for reusing unit test on different functions in Python
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    <p>I'm new to unit testing and want to start with the <a href="http://readthedocs.org/docs/nose/en/latest/index.html" rel="nofollow">nose framework</a>. But answers using <a href="http://docs.python.org/library/unittest.html" rel="nofollow">unittest</a>, <a href="http://pytest.org/latest/" rel="nofollow">pytest</a> are welcome too. Also of course, general advice.</p> <p>I think I get the basic concept but I lack practice in setting up <em>good</em> test. I'm also struggling with how to layout the tests. <em>I'm especially unsure on how to approach the case where I want to run a couple of test cases on different function of a module:</em></p> <p>For example: I might have a module called <code>diceroller.py</code> it contains a couple of function on simulating rolling dice, modify and test the results and so on. All functions for rolling dice should run trough the same tests (do they return a list of integers, with the right amount of values, are the values in range, etc.). But some of those should also be run against some additional cases.</p> <p>So I got a subdir <code>test</code> and want to setup my testcode there. How do I approach this?</p> <pre><code># a section of `diceroller.py` def roll_a_dice(sides=6): """Return an integer x where `x &gt;= 1 &lt;= sides`""" return random.randint(1, sides) def roll_dice(sides=6, count=1): """Return a list of integers (most function except this)""" rolls = list() while count: rolls.append(random.randint(1, sides)) count -= 1 return rolls def roll_some_dice(sides=6, count=1, times=1): """Return a list of list containing integers""" some_rolls = list() while times: some_rolls.append(roll_dice(sides, count)) times -= 1 return some_rolls def rolling_dice(sides=6, count=1): """Yielding integers `count` times""" while count: count -= 1 yield random.randint(1, sides) </code></pre> <p><strong>Small update</strong></p> <p>Simeon Visser has a good point. But the code above where just functions too ad some context to my Questions, which just is: <em>How can I (re)use test cases on different functions?</em></p> <p>I guess writing tests like <code>check_xyz</code> and then calling it from <code>test_a</code> and <code>test_b</code> for example, is the easiest solution? Or is this bad practice?</p> <p>The solution from Rik Poggi seems to do exactly what is was trying to accomplish (will play around with it right after typing this). But I kinda have the feeling it "complicates" things to much... probably not on the technical side but it comes as "too much" maybe.</p>
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    1. COOne great thing about testing is that it helps to reveal where you should refactor. Before thinking about trying to reuse tests, I would think about factoring out the code common to dice rolling, and testing that. For example, all of your functions above are just special cases of `role_some_dice`.
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