diff -r 62ddf16eea24 Lib/unittest/__main__.py
--- a/Lib/unittest/__main__.py	Mon Sep 24 17:31:37 2012 +0300
+++ b/Lib/unittest/__main__.py	Fri Sep 28 10:17:06 2012 +0100
@@ -2,7 +2,13 @@
 
 import sys
 if sys.argv[0].endswith("__main__.py"):
-    sys.argv[0] = "python -m unittest"
+    import os.path
+    # use executable without path, unquoted
+    # (it's just a hint anyway)
+    # (if you have spaces in your executable you get what you deserve!)
+    executable = os.path.basename(sys.executable)
+    sys.argv[0] = executable + " -m unittest"
+    del os
 
 __unittest = True