Do not break extension tests if tested with installed extensions.

flask/testsuite/__init__.py

@@ -24,7 +24,10 @@ from werkzeug.utils import import_string, find_modules
 
 
 def add_to_path(path):
-    """Adds an entry to sys.path_info if it's not already there."""
+    """Adds an entry to sys.path_info if it's not already there.  This does
+    not append it but moves it to the front so that we can be sure it
+    is loaded.
+    """
     if not os.path.isdir(path):
         raise RuntimeError('Tried to add nonexisting path')
 
@@ -33,13 +36,8 @@ def add_to_path(path):
             return os.path.samefile(x, y)
         except (IOError, OSError):
             return False
-    for entry in sys.path:
-        try:
-            if os.path.samefile(path, entry):
-                return
-        except (OSError, IOError):
-            pass
-    sys.path.append(path)
+    sys.path[:] = [x for x in sys.path if not _samefile(path, x)]
+    sys.path.insert(0, path)
 
 
 def iter_suites():

flask/testsuite/ext.py

@@ -18,10 +18,15 @@ from flask.testsuite import FlaskTestCase
 class ExtImportHookTestCase(FlaskTestCase):
 
     def setup(self):
+        # we clear this out for various reasons.  The most important one is
+        # that a real flaskext could be in there which would disable our
+        # fake package.  Secondly we want to make sure that the flaskext
+        # import hook does not break on reloading.
         for entry, value in sys.modules.items():
             if (entry.startswith('flask.ext.') or
                 entry.startswith('flask_') or
-                entry.startswith('flaskext.')) and value is not None:
+                entry.startswith('flaskext.') or
+                entry == 'flaskext') and value is not None:
                 sys.modules.pop(entry, None)
         from flask import ext
         reload(ext)

run-tests.py

@@ -1,3 +1,5 @@
 #!/usr/bin/env python
+import sys, os
+sys.path.insert(0, os.path.abspath(os.path.dirname(__file__)))
 from flask.testsuite import main
 main()