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POpython dynamic test generation
 

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  1. POpython dynamic test generation
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    <p>I've a base class that yields test cases. Concrete implementations of the class register tests. Since nose only supports test generation via yield for test functions (not classes) I want a class decorator that applies the necessary function wrapping.</p> <p>NOTE: the reason why I need to yield test cases is that the test class needs to do some initialization that cannot be run in setUp.</p> <p>Below is a minimal example that shows the expected behavior, however, it only works if the <code>make_generator</code> decorator is <strong>in</strong> the current module - when I move it to a separate module no tests are yielded. Can anybody tell me why this happens?</p> <pre><code>def make_generator(cls): """returns a function that instantiates ``cls`` and yields tests. """ def generator(): obj = cls() for t in obj: yield t generator.__name__ = 'test_%s' % cls.__name__ return generator def register(func): """Set _check attr of ``func``. """ func._check = True return func class BaseMixin(object): def __init__(self): """Register check handlers. """ self.check_handlers = [] attrs = (attr for attr in dir(self) if not attr.startswith('__')) for attr in attrs: func = getattr(self, attr) if getattr(func, '_check', False): self.check_handlers.append(attr) def __iter__(self): """Generate tests for registered handlers. """ # do stuff args = [] for check in self.check_handlers: func = getattr(self, check) yield func, args @make_generator class ConcreteTest(BaseMixin): @register def check_foobar(self, args): assert False </code></pre>
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    1. PTQuestion
    1. USPeter Prettenhofer
    1. USPeter Prettenhofer
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    1. PO
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    1. COI'm a little confused why you're making a generator instead of just using nose's duck typing schema? Why make your life harder?
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      1. POpython dynamic test generation
      1. USGreg
    2. COwhat do you mean by nose's duck typing schema exactly?
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      1. POpython dynamic test generation
      1. USPeter Prettenhofer
    3. COI mean declaring all your tests along the lines of `def test_foo():` `def test_baz():`. Are you using nose?
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      1. POpython dynamic test generation
      1. USGreg
 

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