Add test for rendering failures on text wrapping across frames

src/tests/Makefile.am

@@ -19,8 +19,10 @@ displaytests = \
 	emulation-back-tab.test \
 	emulation-cursor-motion.test \
 	emulation-multiline-scroll.test \
+	emulation-wrap-across-frames.test \
 	server-network-timeout.test \
 	server-signal-timeout.test \
+	window-resize.test \
 	unicode-combine-fallback-assert.test \
 	unicode-later-combining.test \
 	window-resize.test

src/tests/emulation-wrap-across-frames.test

@@ -0,0 +1,109 @@
+#!/bin/sh
+
+#
+# This is a regression test for a bug seen where mosh-server's
+# round-trip verification failed if text was filled to column 80 on
+# frame N and then wrapped to the next line on frame N+1, because the
+# wrap flag used to be in the Cell class and caused miscompares
+# between cells.  It got moved to the Rows class where it makes more
+# sense.
+#
+fail()
+{
+    printf "$@" 2>&1
+    exit 99
+}
+
+
+
+PATH=$PATH:.:$srcdir
+# Top-level wrapper.
+if [ $# -eq 0 ]; then
+    e2e-test $0 baseline direct verify
+    exit
+fi
+
+# OK, we have arguments, we're one of the test hooks.
+if [ $# -ne 1 ]; then
+    fail "bad arguments %s\n" "$@"
+fi
+
+sleepf()
+{
+    (sleep .1 || sleep 1) > /dev/null 2>&1
+}
+
+seq()
+{
+    if [ $# -lt 1 -o $# -gt 3 ]; then
+	echo "bad args" >&2
+    fi
+    first=$1
+    incr=1
+    last=0
+    case $# in
+	3)
+	    incr=$2
+	    last=$3
+	    ;;
+	2)
+	    last=$2
+	    ;;
+	1)
+	    ;;
+    esac
+    while :; do
+	printf '%d\n' $first
+	first=$(expr $first + $incr)
+	if [ $first -gt $last ]; then
+	    break
+	fi
+    done
+}
+
+chr()
+{
+    printf "\\$(printf %03o $1)"
+}
+
+utf8cp()
+{
+    local c=$1
+    if [ $c -gt $((0x10ffff)) ]; then
+	fail "illegal Unicode code point %x\n" $c
+    elif [ $c -lt $((0x80)) ]; then
+	chr $c
+    elif [ $c -lt $((0x800)) ]; then
+	chr $(( (($c >>  6) & 0x1f) | 0xc0 ))
+	chr $(( ($c & 0x3f)         | 0x80 ))
+    elif [ $c -lt $((0x10000)) ]; then
+	chr $(( (($c >> 12) & 0x0f) | 0xe0 ))
+	chr $(( (($c >>  6) & 0x3f) | 0x80 ))
+	chr $(( ($c & 0x3f)         | 0x80 ))
+    elif [ $c -lt $((0x200000)) ]; then
+	chr $(( (($c >> 18) & 0x03) | 0xf0 ))
+	chr $(( (($c >> 12) & 0x3f) | 0x80 ))
+	chr $(( (($c >>  6) & 0x3f) | 0x80 ))
+	chr $(( ($c & 0x3f)         | 0x80 ))
+    fi
+}
+
+baseline()
+{
+    printf '\033[H\033[J'
+
+    for x in $(seq 1 10); do
+	printf "abcdXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX1234"
+	sleep .1
+	printf "ABCDxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx5678"
+	sleep .1
+    done
+    printf '\n'
+} 
+
+case $1 in
+    baseline|direct)
+	baseline;;
+    *)
+	fail "unknown test argument %s\n" $1;;
+esac