[jhbuild] tests: fix unit tests broken by setup_env() changes

[Frederic Peters <fpeters src gnome org>]

commit 2446f35a12e962993d88f79337518df7dd947f99
Author: Frédéric Péters <fpeters 0d be>
Date:   Wed Jan 28 15:49:22 2015 +0100

    tests: fix unit tests broken by setup_env() changes

 tests/tests.py |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/tests/tests.py b/tests/tests.py
index 7410f7e..1745db1 100644
--- a/tests/tests.py
+++ b/tests/tests.py
@@ -88,7 +88,8 @@ class TestConfig(jhbuild.config.Config):
         pass
 
     def real_setup_env(self):
-        jhbuild.config.Config.setup_env(self)
+        from jhbuild.environment import setup_env
+        setup_env(self.prefix)
 
 class JhbuildConfigTestCase(unittest.TestCase):
     """A test case that creates a mock configuration and temporary directory."""