From 526541f90e865bc8598e59daa2b70c2181d5d5db Mon Sep 17 00:00:00 2001
From: Steve Bennett <steveb@workware.net.au>
Date: Thu, 22 Jun 2023 08:13:53 +1000
Subject: tests: tty.test: use a pty pair if stdin/stdout is not a tty

Signed-off-by: Steve Bennett <steveb@workware.net.au>
---
 tests/tty.test | 37 +++++++++++++++++++++++++------------
 1 file changed, 25 insertions(+), 12 deletions(-)

diff --git a/tests/tty.test b/tests/tty.test
index 5199e6a..104683f 100644
--- a/tests/tty.test
+++ b/tests/tty.test
@@ -1,21 +1,34 @@
 source [file dirname [info script]]/testing.tcl
 
-needs cmd {stdout tty}
-if {![stdout isatty]} {
-    skiptest "  (aio tty)"
+needs cmd {stdin tty}
+needs cmd {stdin isatty}
+
+if {[stdin isatty]} {
+	set chan stdin
+} else {
+	# If stdin isn't a tty, try to create a pty pair
+	if {[catch {
+		lassign [socket pty] chan schan
+	}]} {
+		skiptest "  (socket pty)"
+	}
+	defer {
+		$chan close
+		$schan close
+	}
 }
 
 test tty-1.1 {tty status} {
-    set dict [stdout tty]
+    set dict [$chan tty]
     dict exists $dict output
 } 1
 
 test tty-1.2 {tty bad param} -body {
-    stdout tty bad value
+    $chan tty bad value
 } -returnCodes error -result {bad setting "bad": must be baud, data, echo, handshake, input, output, parity, stop, vmin, or vtime}
 
 test tty-1.3 {tty bad baud} -body {
-    stdout tty baud 12345
+    $chan tty baud 12345
 } -returnCodes error -result {bad value for baud: 12345}
 
 test tty-1.4 {tty bad fd} -body {
@@ -33,20 +46,20 @@ foreach {param value} {
     handshake rtscts
 } {
     test tty-1.[incr n] "tty setting $param" -setup {
-        set savetty [stdout tty]
-    } -body "stdout tty $param $value; dict get \[stdout tty\] $param" \
+        set savetty [$chan tty]
+    } -body "$chan tty $param $value; dict get \[$chan tty\] $param" \
         -result $value -cleanup {
-        stdout tty $savetty
+        $chan tty $savetty
     }
 }
 
 set n 0
 foreach param {output input handshake baud stop data vmin vtime} {
     test tty-2.[incr n] "tty bad setting $param" -setup {
-        set savetty [stdout tty]
-    } -body "stdout tty $param bad" \
+        set savetty [$chan tty]
+    } -body "$chan tty $param bad" \
     -returnCodes error -result "bad value for $param: bad" -cleanup {
-        stdout tty $savetty
+        $chan tty $savetty
     }
 }
 
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