Add "remove_stale_bytecode()". This removes .pyc and .pyo files that

don't have a corresponding .py file, to prevent tests that import
deleted modules from running using the stale bytecode files.  This has
bitten enough people enough times that it's time it became a standard
part of every test suite runner.  (Zope3 already has it.)

Somebody merge this into the Zope2 trunk please.

utilities/testrunner.py

@@ -192,6 +192,15 @@ class TestRunner:
             sys.stderr.write( '*** Restoring directory to: %s\n' % working_dir )
         os.chdir(working_dir)
 
+def remove_stale_bytecode(arg, dirname, names):
+    names = map(os.path.normcase, names)
+    for name in names:
+        if name.endswith(".pyc") or name.endswith(".pyo"):
+            srcname = name[:-1]
+            if srcname not in names:
+                fullname = os.path.join(dirname, name)
+                print "Removing stale bytecode file", fullname
+                os.unlink(fullname)
 
 def main(args):
 
@@ -305,6 +314,8 @@ def main(args):
         else:
             err_exit(usage_msg)
 
+    os.path.walk(os.curdir, remove_stale_bytecode, None)
+
     testrunner = TestRunner( os.getcwd()
                            , verbosity=verbosity
                            , mega_suite=mega_suite)