Previously, this would fail with a NoSuchMethodError:
class Package(object):
# this is the default implementation
def some_method(self):
...
class Foo(Package):
@when('platform=cray')
def some_method(self):
...
@when('platform=linux')
def some_method(self):
...
This fixes the implementation of `@when` so that the superclass method
will be invoked when no subclass method matches.
Adds tests to ensure this works, as well.
e3101808ae