Add UTF-8 regress test.

regress/utf8-test.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+PATH=/bin:/usr/bin
+TERM=screen
+
+[ -z "$TEST_TMUX" ] && TEST_TMUX=$(readlink -f ../tmux)
+TMUX="$TEST_TMUX -Ltest"
+TMP=$(mktemp)
+trap "rm -f $TMP" 0 1 15
+$TMUX kill-server 2>/dev/null
+
+$TMUX -f/dev/null \
+	  set -g remain-on-exit on \; \
+	  set -g remain-on-exit-format '' \; \
+      new -d -- cat UTF-8-test.txt
+sleep 1
+$TMUX capturep -pCeJS- >$TMP
+$TMUX kill-server
+
+cmp -s $TMP utf8-test.result || exit 1
+exit 0