Fixed unit tests for os.environ. Some of the tests didn't test at all because os.environ was empty.

Added import test for sys.path entries with non ASCII characters. The tests are passing on my Ubuntu box with utf-8 locales but they aren't passing on Windows XP.

Lib/test/test_import.py

@@ -3,10 +3,11 @@ from test.test_support import TESTFN, run_unittest, catch_warning
 import unittest
 import os
 import random
+import shutil
 import sys
 import py_compile
 import warnings
-from test.test_support import unlink
+from test.test_support import unlink, TESTFN, unload
 
 
 def remove_files(name):
@@ -157,8 +158,37 @@ class ImportTest(unittest.TestCase):
             warnings.simplefilter('error', ImportWarning)
             self.assertRaises(ImportWarning, __import__, "site-packages")
 
+class UnicodePathsTests(unittest.TestCase):
+    SAMPLES = ('test', 'testäöüß', 'testéè', 'test°³²')
+    path = TESTFN
+
+    def setUp(self):
+        os.mkdir(self.path)
+        self.syspath = sys.path[:]
+
+    def tearDown(self):
+        shutil.rmtree(self.path)
+        sys.path = self.syspath
+
+    def test_sys_path(self):
+        for i, subpath in enumerate(self.SAMPLES):
+            path = os.path.join(self.path, subpath)
+            os.mkdir(path)
+            self.failUnless(os.path.exists(path), os.listdir(self.path))
+            f = open(os.path.join(path, 'testimport%i.py' % i), 'w')
+            f.write("testdata = 'unicode path %i'\n" % i)
+            f.close()
+            sys.path.append(path)
+            try:
+                mod = __import__("testimport%i" % i)
+            except ImportError:
+                print(path, file=sys.stderr)
+                raise
+            self.assertEqual(mod.testdata, 'unicode path %i' % i)
+            unload("testimport%i" % i)
+
 def test_main(verbose=None):
-    run_unittest(ImportTest)
+    run_unittest(ImportTest, UnicodePathsTests)
 
 if __name__ == '__main__':
     test_main()