fix genscript by copying the new implementation from the genscript package

--HG--
branch : trunk

testing/plugin/test_genscript.py

@@ -1,8 +1,6 @@
 import py, os, sys
 import subprocess
 
-pytestmark = py.test.mark.xfail(run=False,
-    reason="XXX needs refactoring after pylib/pytest split")
 
 def pytest_funcarg__standalone(request):
     return request.cached_setup(scope="module", setup=lambda: Standalone(request))
@@ -20,7 +18,6 @@ class Standalone:
         testdir.chdir()
         return testdir._run(anypython, self.script, *args)
 
-@pytestmark # XXX bug in application of global markers to generated functions?
 def test_gen(testdir, anypython, standalone):
     result = standalone.run(anypython, testdir, '-h')
     assert result.ret == 0