[AstroPy] Using test classes with astropy testing framework

[Christoph Deil]

> On 07 May 2015, at 15:47, Andrew Hearin <andrew.hearin at yale.edu> wrote:
> 
> Hi everyone,
> 
> I’m using the Astropy package template to develop a package, and have thus far had an entirely painless experience building a test suite using the py.test settings that come pre-configured with the template. However, I am now trying to use python classes to construct a series of tests, and for some (almost undoubtedly simple) reason, py.test is not detecting my tests that appear within a class. 
> 
> In the following example, I have done my best to match the pattern used in the test_representation module that appears in the coordinates sub-package of astropy:
> 
> 
> def trivial_test():
> 	assert 42 == 42
> 
> class DummyTestClass(object):
> 
> 	def dummy_test(self):
> 		assert 42 == 43
> 
> 
> Ok, so that’s my setup. Now here’s the problem. When I run "python setup.py test” from my sub-package root directory, the testing module in which the above code appears does indeed execute, but the result only registers as “1 passed”, rather than “1 failed, 1 passed”, meaning that dummy_test is not executing. 
> 
> How should I modify my test suite to run tests that are embedded in classes? In the examples I have looked at online, all of them seem to use a __main__ execution, but Astropy testing does not seem to proceed this way, and I would rather do what y’all do. 
> 
> Cheers,
> Andrew
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You have to follow the pytest conventions for test discovery:
http://pytest.org/latest/goodpractises.html#conventions-for-python-test-discovery <http://pytest.org/latest/goodpractises.html#conventions-for-python-test-discovery>

I.e. start functions with `test_` and classes with `Test`.

This works:


def test_trivial():
	assert 42 == 42

class TestDummyClass(object):

	def test_dummy(self):
		assert 42 == 43


Christoph
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