Oups nevermind, I did not see this release comment :
<< The
FactoryAttribute and
TestCaseFactoryAttribute introduced
in alhpa-3 have been removed. The new
TestCaseSourceAttribute allows
specification of the name of the source of test cases and - optionally - the
type providing the source if it is not the same as the type that contains the
test. Only one source may be specified per attribute but the attribute may be
applied more than once to indicate multiple sources.
>>
sorry