From 646637f53ab7c64eb8edcb86eb0f73fc4c3a19b8 Mon Sep 17 00:00:00 2001
From: Nicholas Marriott <nicholas.marriott@gmail.com>
Date: Fri, 3 Jul 2026 23:45:22 +0100
Subject: [PATCH] Add control subs test.

---
 regress/control-subscriptions.sh | 172 +++++++++++++++++++++++++++++++
 1 file changed, 172 insertions(+)
 create mode 100644 regress/control-subscriptions.sh

diff --git a/regress/control-subscriptions.sh b/regress/control-subscriptions.sh
new file mode 100644
index 000000000..25c732ac0
--- /dev/null
+++ b/regress/control-subscriptions.sh
@@ -0,0 +1,172 @@
+#!/bin/sh
+
+PATH=/bin:/usr/bin
+TERM=screen
+LC_ALL=C.UTF-8
+LANG=C.UTF-8
+export TERM LC_ALL LANG
+
+[ -z "$TEST_TMUX" ] && TEST_TMUX=$(readlink -f ../tmux)
+TMUX="$TEST_TMUX -Ltest -f/dev/null"
+
+TMPDIR=$(mktemp -d)
+IN="$TMPDIR/in"
+OUT="$TMPDIR/out"
+PID=
+
+cleanup()
+{
+	[ -n "$PID" ] && kill "$PID" 2>/dev/null
+	$TMUX kill-server 2>/dev/null
+	rm -rf "$TMPDIR"
+}
+trap cleanup EXIT
+
+wait_for()
+{
+	pattern=$1
+	timeout=${2:-6}
+	i=0
+
+	while [ "$i" -lt "$timeout" ]; do
+		if grep -F -- "$pattern" "$OUT" >/dev/null 2>&1; then
+			return 0
+		fi
+		sleep 1
+		i=$((i + 1))
+	done
+	echo "missing: $pattern"
+	cat "$OUT"
+	return 1
+}
+
+reject_for()
+{
+	pattern=$1
+	timeout=${2:-3}
+	i=0
+
+	while [ "$i" -lt "$timeout" ]; do
+		if grep -F -- "$pattern" "$OUT" >/dev/null 2>&1; then
+			echo "unexpected: $pattern"
+			cat "$OUT"
+			return 1
+		fi
+		sleep 1
+		i=$((i + 1))
+	done
+	return 0
+}
+
+wait_tmux()
+{
+	target=$1
+	timeout=${2:-6}
+	i=0
+
+	while [ "$i" -lt "$timeout" ]; do
+		if $TMUX display-message -p -t "$target" '#{window_id}' \
+		    >/dev/null 2>&1; then
+			return 0
+		fi
+		sleep 1
+		i=$((i + 1))
+	done
+	return 1
+}
+
+window_fields()
+{
+	$TMUX display-message -p -t "$1" '#{window_id} #{window_index}'
+}
+
+pane_fields()
+{
+	$TMUX display-message -p -t "$1" '#{window_id} #{window_index} #{pane_id}'
+}
+
+send()
+{
+	printf '%s\n' "$*" >&3
+}
+
+$TMUX kill-server 2>/dev/null
+$TMUX new-session -d -s subs -x 80 -y 24 || exit 1
+sid=$($TMUX display-message -p -t subs '#{session_id}')
+
+mkfifo "$IN"
+: >"$OUT"
+$TMUX -C attach-session -t subs <"$IN" >"$OUT" 2>&1 &
+PID=$!
+exec 3>"$IN"
+
+send 'display-message -p ready'
+wait_for 'ready' 3 || exit 1
+
+send "refresh-client -B 'sw::#{session_windows}'"
+wait_for "%subscription-changed sw $sid - - - : 1" || exit 1
+
+send 'new-window'
+wait_for "%subscription-changed sw $sid - - - : 2" || exit 1
+
+send 'refresh-client -B sw'
+send 'new-window'
+reject_for "%subscription-changed sw $sid - - - : 3" || exit 1
+
+send 'new-window -n pane-test'
+wait_tmux subs:pane-test || exit 1
+set -- $(pane_fields subs:pane-test)
+wid=$1
+widx=$2
+pane=$3
+
+send "refresh-client -B 'ap:%*:#{pane_id}'"
+wait_for "%subscription-changed ap $sid $wid $widx $pane : $pane" || exit 1
+
+send 'split-window -t subs:pane-test'
+i=0
+while [ "$i" -lt 6 ]; do
+	[ "$($TMUX list-panes -t subs:pane-test | wc -l)" -eq 2 ] && break
+	sleep 1
+	i=$((i + 1))
+done
+[ "$i" -lt 6 ] || exit 1
+newpane=$($TMUX list-panes -t subs:pane-test -F '#{pane_id}' | tail -n 1)
+wait_for "%subscription-changed ap $sid $wid $widx $newpane : $newpane" ||
+    exit 1
+
+$TMUX new-session -d -s other || exit 1
+$TMUX link-window -s subs:pane-test -t other:1 || exit 1
+
+send "refresh-client -B 'sp:$newpane:#{pane_id}:#{window_id}'"
+wait_for "%subscription-changed sp $sid $wid $widx $newpane : $newpane:$wid" ||
+    exit 1
+
+send "refresh-client -B 'cw:$wid:#{window_id}:#{window_index}'"
+wait_for "%subscription-changed cw $sid $wid $widx - : $wid:$widx" ||
+    exit 1
+
+send "refresh-client -B 'aw:@*:#{window_id}'"
+send 'new-window -n window-test'
+wait_tmux subs:window-test || exit 1
+set -- $(window_fields subs:window-test)
+awid=$1
+awidx=$2
+wait_for "%subscription-changed aw $sid $awid $awidx - : $awid" || exit 1
+
+send "refresh-client -B 'dup::#{session_windows}'"
+wcount=$($TMUX display-message -p -t subs '#{session_windows}')
+wait_for "%subscription-changed dup $sid - - - : $wcount" || exit 1
+send "refresh-client -B 'dup::#{session_name}'"
+wait_for "%subscription-changed dup $sid - - - : subs" || exit 1
+send 'new-window -n dup-test'
+wait_tmux subs:dup-test || exit 1
+wcount=$($TMUX display-message -p -t subs '#{session_windows}')
+reject_for "%subscription-changed dup $sid - - - : $wcount" || exit 1
+
+send "refresh-client -B 'missing-pane:%999999:#{pane_id}'"
+send "refresh-client -B 'missing-window:@999999:#{window_id}'"
+reject_for '%subscription-changed missing-pane' || exit 1
+reject_for '%subscription-changed missing-window' || exit 1
+
+exit 0