=== modified file 'bzrlib/tests/__init__.py'
--- bzrlib/tests/__init__.py    2006-08-11 10:03:44 +0000
+++ bzrlib/tests/__init__.py    2006-08-28 22:36:10 +0000
@@ -801,6 +801,9 @@
         """
         bzr_path = os.path.dirname(os.path.dirname(bzrlib.__file__))+'/bzr'
         args = list(args)
+        if not os.path.isfile(bzr_path):
+            # We are probably installed. Assume sys.argv is the right file
+            bzr_path = sys.argv[0]
         process = Popen([sys.executable, bzr_path]+args, stdout=PIPE,
                          stderr=PIPE)
         out = process.stdout.read()