From d6a77cc6f78d9dd6c6ff3031b5458e7954046546 Mon Sep 17 00:00:00 2001
From: Fabian Homborg <FHomborg@gmail.com>
Date: Fri, 12 Feb 2021 18:50:42 +0100
Subject: [PATCH] Test flow control

This is a bit of an interesting pexpect test, but honestly pexpect
works quite well! I'm happy with it!
---
 tests/pexpects/terminal.py | 32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/tests/pexpects/terminal.py b/tests/pexpects/terminal.py
index cdcfeb65f..8289b078f 100644
--- a/tests/pexpects/terminal.py
+++ b/tests/pexpects/terminal.py
@@ -3,7 +3,14 @@ from pexpect_helper import SpawnedProc
 
 # Set a 0 terminal size
 sp = SpawnedProc(args=["-d", "term-support"], dimensions=(0,0))
-sendline, expect_prompt, expect_str = sp.sendline, sp.expect_prompt, sp.expect_str
+send, sendline, sleep, expect_prompt, expect_re, expect_str = (
+    sp.send,
+    sp.sendline,
+    sp.sleep,
+    sp.expect_prompt,
+    sp.expect_re,
+    sp.expect_str,
+)
 
 expect_prompt()
 # Now confirm it defaulted to 80x24
@@ -13,3 +20,26 @@ expect_str("term-support: Terminal has 0 columns, falling back to default width"
 expect_str("term-support: Terminal has 0 rows, falling back to default height")
 expect_prompt()
 
+sendline("stty -a")
+expect_prompt()
+# Confirm flow control in the shell is disabled - we should ignore the ctrl-s in there.
+sendline("echo hello\x13hello")
+expect_prompt("hellohello")
+
+# Confirm it is off for external commands
+sendline("stty -a | string match -q '*-ixon -ixoff*'; echo $status")
+expect_prompt("0")
+
+# Turn flow control on
+sendline("stty ixon ixoff")
+expect_prompt()
+sendline("stty -a | string match -q '*ixon ixoff*'; echo $status")
+expect_prompt("0")
+
+# Confirm flow control in the shell is disabled - we should ignore the ctrl-s in there.
+sendline("echo hello\x13hello")
+# This should not match because we should not get any output.
+# Unfortunately we have to wait for the timeout to expire - set it to a second.
+expect_str("hellohello", timeout=1, shouldfail=True)
+send("\x11") # ctrl-q to resume flow
+expect_prompt("hellohello")