TL;DR
- Use gocept.pytestlayer.
Long Story
We have many test suites which use test layers (e. g. the ones from plone.testing). We want to use py.test and all its fancy features to have a modern test runner. There was no way to convert such tests partly: either you have to port the whole project or you are stuck with the zope.testrunner.
On our Pyramid-Sprint Godefroid Chapelle, Thomas Lotze and me wrote a package which wraps layers as py.test fixtures. The result is gocept.pytestlayer.
Implementation
For each layer it creates two fixtures: one for the layer setUp/tearDown and one for the testSetUp/testTearDown. The layer fixture is configured for class scope but the plug-in orders the tests and knows about the next test so the layer is only torn down if the next test needs another fixture.
Usage
You only have to add a new section to your package buildout and running the test via
bin/py.test -x
detects the layers and displays the needed setup code. See the PyPI-Page of the package for details.
Future
Maybe it is possible to get rid of the fixture setup code, so running tests using layers gets even easier.
