Upstream-Status: Backport
Signed-off-by: Ross Burton <ross.burton@intel.com>

From cabe916dc694997d4892b58986e73a713d5a2f8d Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Thu, 16 Aug 2018 15:38:03 -0400
Subject: [PATCH] [3.6] bpo-34391: Fix ftplib test for TLS 1.3 (GH-8787)
 (#8790)

Read from data socket to avoid "[SSL] shutdown while in init" exception
during shutdown of the dummy server.

Signed-off-by: Christian Heimes <christian@python.org>


<!-- issue-number: [bpo-34391](https://www.bugs.python.org/issue34391) -->
https://bugs.python.org/issue34391
<!-- /issue-number -->
(cherry picked from commit 1590c393360df059160145e7475754427bfc6680)


Co-authored-by: Christian Heimes <christian@python.org>
---
 Lib/test/test_ftplib.py                                         | 5 +++++
 Misc/NEWS.d/next/Tests/2018-08-16-18-48-47.bpo-34391.ouNfxC.rst | 1 +
 2 files changed, 6 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Tests/2018-08-16-18-48-47.bpo-34391.ouNfxC.rst

diff --git a/Lib/test/test_ftplib.py b/Lib/test/test_ftplib.py
index 44dd73aeca..4ff2f71afb 100644
--- a/Lib/test/test_ftplib.py
+++ b/Lib/test/test_ftplib.py
@@ -876,18 +876,23 @@ class TestTLS_FTPClass(TestCase):
         # clear text
         with self.client.transfercmd('list') as sock:
             self.assertNotIsInstance(sock, ssl.SSLSocket)
+            self.assertEqual(sock.recv(1024), LIST_DATA.encode('ascii'))
         self.assertEqual(self.client.voidresp(), "226 transfer complete")
 
         # secured, after PROT P
         self.client.prot_p()
         with self.client.transfercmd('list') as sock:
             self.assertIsInstance(sock, ssl.SSLSocket)
+            # consume from SSL socket to finalize handshake and avoid
+            # "SSLError [SSL] shutdown while in init"
+            self.assertEqual(sock.recv(1024), LIST_DATA.encode('ascii'))
         self.assertEqual(self.client.voidresp(), "226 transfer complete")
 
         # PROT C is issued, the connection must be in cleartext again
         self.client.prot_c()
         with self.client.transfercmd('list') as sock:
             self.assertNotIsInstance(sock, ssl.SSLSocket)
+            self.assertEqual(sock.recv(1024), LIST_DATA.encode('ascii'))
         self.assertEqual(self.client.voidresp(), "226 transfer complete")
 
     def test_login(self):
-- 
2.11.0