[TIP] Using one unit test with different input parameters

Ben Finney bignose+hates-spam at benfinney.id.au
Sat Jul 12 07:14:33 PDT 2008

Robert Collins <robertc at robertcollins.net> writes:

> You might like to look at bzrlib.tests.TestScenarioApplier.

I've now migrated to this approach in a pilot project; it's working
well, and I'll likely use it elsewhere. Thank you.

It helps a lot that Bazaar is licensed under GPL :-)

> When run, you'll have test ids like:
> test_foo.TestSite.test_a(wessex)
> test_foo.TestSite.test_a(example.com)
> test_foo.TestSite.test_a(example.org)
> test_foo.TestSite.test_b(wessex)
> test_foo.TestSite.test_b(example.com)
> test_foo.TestSite.test_b(example.org)
> Which is much nicer for debugging [than] a for loop within a single test.

Those id values certainly would make it simpler to identify test
cases. I don't know how to get them via the standard unittest
infrastructure, though.

I see that 'TestCase.id' is a method provided already by
'unittest.TestCase', and you're overriding it in the generated test
case instances.

What I don't see is anything that actually *uses* this method. I can
find nothing in the standard library 'unittest' module that actually
uses it.

How are you getting these values at run time? A custom TestRunner

 \     “It is far better to grasp the universe as it really is than to |
  `\    persist in delusion, however satisfying and reassuring.” —Carl |
_o__)                                                            Sagan |
Ben Finney

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