Fix the test's astroid cache problem.

There were two problems until now:

  * first, the transformed builtin object was deleting during clear_cache,
    leaving the next tests to use the untransformed tests, which yielded
    InferenceErrors.

  * after the first problem was fixed, another problem with CONST_PROXY
    occurred, since it was creating a new builtins object, without
    the builtins transformations applied, which was used for creating
    the const classes. The problem was that even replacing the
    builtins instance in astroid_cache, InferenceErrors occurred,
    because the const classes were already built and they were referencing
    the untransformed builtins. That's why _astroid_bootstrapping
    allows to receive a new builtins object, which is passed
    properly by the tests.

1 files changed, 4 insertions, 3 deletions

diff --git a/astroid/manager.py b/astroid/manager.py
index f5a2404c..322cff93 100644
--- a/astroid/manager.py
+++ b/astroid/manager.py
@@ -348,15 +348,16 @@ class AstroidManager(OptionsProviderMixIn):
         """Cache a module if no module with the same name is known yet."""
         self.astroid_cache.setdefault(module.name, module)
 
-    def clear_cache(self):
+    def clear_cache(self, astroid_builtin=None):
         # XXX clear transforms
         self.astroid_cache.clear()
         # force bootstrap again, else we may ends up with cache inconsistency
         # between the manager and CONST_PROXY, making
         # unittest_lookup.LookupTC.test_builtin_lookup fail depending on the
         # test order
-        from astroid.raw_building import astroid_bootstrapping
-        astroid_bootstrapping()
+        import astroid.raw_building        
+        astroid.raw_building._astroid_bootstrapping(
+            astroid_builtin=astroid_builtin)
 
 
 class Project(object):