Index: Lib/importlib/test/test_api.py
===================================================================
--- Lib/importlib/test/test_api.py	(revision 74113)
+++ Lib/importlib/test/test_api.py	(working copy)
@@ -2,6 +2,9 @@
 import imp
 import importlib
 import sys
+import os
+import stat
+import test.support
 import unittest
 
 
@@ -65,7 +68,38 @@
         # set.
         self.assertRaises(TypeError, importlib.import_module, '.support')
 
+    def test_issue_xxxx(self):
+        # An intermittent test failure led to the discovery that if (a) '.' is
+        # in sys.path and (b) import_module is used, then when a new
+        # module is imported via __import__, the 'w' flag is set on the
+        # .pyc file regardless of whether or not it was set on the .py file.
+        TESTFN = test.support.TESTFN
+        sys.path = ['.'] + sys.path
+        self.addCleanup(sys.path.pop, 0)
+        test.support.unload('fileinput')
+        importlib.import_module('fileinput')
+        self.addCleanup(test.support.unload, 'fileinput')
 
+        oldmask = os.umask(0o022)
+        self.addCleanup(os.umask, oldmask)
+        sys.path.insert(0, os.curdir)
+        self.addCleanup(sys.path.pop, 0)
+        fname = TESTFN + os.extsep + "py"
+        f = open(fname, 'w').close()
+        os.chmod(fname, (stat.S_IRUSR | stat.S_IRGRP | stat.S_IROTH |
+                         stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH))
+        __import__(TESTFN)
+        self.addCleanup(test.support.forget, TESTFN)
+        fn = fname + 'c'
+        if not os.path.exists(fn):
+            fn = fname + 'o'
+            if not os.path.exists(fn): raise TestFailed("__import__ did "
+                "not result in creation of either a .pyc or .pyo file")
+        s = os.stat(fn)
+        self.assertEquals(stat.S_IMODE(s.st_mode),
+                          stat.S_IRUSR | stat.S_IRGRP | stat.S_IROTH)
+
+
 def test_main():
     from test.support import run_unittest
     run_unittest(ImportModuleTests)