Test existing handling of AF_UNIX addresses.

diff --git a/Lib/test/test_socket.py b/Lib/test/test_socket.py
--- a/Lib/test/test_socket.py
+++ b/Lib/test/test_socket.py
@@ -1352,6 +1352,48 @@ class TestLinuxAbstractNamespace(unittes
         s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
         self.assertRaises(socket.error, s.bind, address)
 
+    def testStrName(self):
+        # Check that an abstract name can be passed as a string.
+        s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+        try:
+            s.bind("\x00python\x00test\x00")
+            self.assertEqual(s.getsockname(), b"\x00python\x00test\x00")
+        finally:
+            s.close()
+
+class TestUnixDomain(unittest.TestCase):
+
+    def setUp(self):
+        self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+
+    def tearDown(self):
+        self.sock.close()
+
+    def encoded(self, path):
+        # Return the given path encoded in the file system encoding,
+        # or skip the test if this is not possible.
+        encoding = sys.getfilesystemencoding()
+        if encoding is None:
+            encoding = sys.getdefaultencoding()
+        try:
+            return path.encode(encoding, "surrogateescape")
+        except UnicodeError:
+            self.skipTest("Pathname {0!a} cannot be represented in file "
+                          "system encoding {1!r}".format(path, encoding))
+
+    def testStrAddr(self):
+        # Test binding to and retrieving a normal string pathname.
+        path = os.path.abspath(support.TESTFN)
+        self.sock.bind(path)
+        self.addCleanup(support.unlink, path)
+        self.assertEqual(self.sock.getsockname(), path)
+
+    def testBytesAddr(self):
+        # Test binding to a bytes pathname.
+        path = os.path.abspath(support.TESTFN)
+        self.sock.bind(self.encoded(path))
+        self.addCleanup(support.unlink, path)
+        self.assertEqual(self.sock.getsockname(), path)
 
 class BufferIOTest(SocketConnectedTest):
     """
@@ -1516,6 +1558,8 @@ def test_main():
     ])
     if hasattr(socket, "socketpair"):
         tests.append(BasicSocketPairTest)
+    if hasattr(socket, "AF_UNIX"):
+        tests.append(TestUnixDomain)
     if sys.platform == 'linux2':
         tests.append(TestLinuxAbstractNamespace)
         tests.append(TestLinuxPathLen)