Fix problem activating dependencies for tests (backport from trunk)

--HG--
branch : setuptools-0.6
extra : convert_revision : svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/sandbox/branches/setuptools-0.6%4054072

setuptools/command/test.py

@@ -96,6 +96,7 @@ class test(Command):
         try:
             sys.path.insert(0, normalize_path(ei_cmd.egg_base))
             working_set.__init__()
+            add_activation_listener(lambda dist: dist.activate())
             require('%s==%s' % (ei_cmd.egg_name, ei_cmd.egg_version))
             func()
         finally:
@@ -120,7 +121,6 @@ class test(Command):
 
 
 
-
     def run_tests(self):
         import unittest
         loader_ep = EntryPoint.parse("x="+self.test_loader)