Actually error out if the test mount fails.

mount.sh

@@ -1,3 +1,7 @@
+#!/bin/sh
+
+set -e
+
 ulimit -c unlimited
 touch testmnt.txt
 ./filejoinfs test.txt testmnt.txt

test.sh

@@ -1,7 +1,32 @@
+#!/bin/sh
+
+set -e
+
 ./mount.sh
 cat testmnt.txt
 head -c 20 testmnt.txt
 tail -c 20 testmnt.txt
 head -c 160 testmnt.txt | tail -n 1
 echo
+
+cnt1=`wc -c test1 | (read a b; echo "$a")`
+if ! expr "x$cnt1" : 'x[0-9][0-9]*$' > /dev/null; then
+	echo 'Could not count the characters in the test1 file'
+	exit 1
+fi
+cnt2=`wc -c test2 | (read a b; echo "$a")`
+if ! expr "x$cnt2" : 'x[0-9][0-9]*$' > /dev/null; then
+	echo 'Could not count the characters in the test1 file'
+	exit 1
+fi
+cnt3=`wc -c test3 | (read a b; echo "$a")`
+if ! expr "x$cnt3" : 'x[0-9][0-9]*$' > /dev/null; then
+	echo 'Could not count the characters in the test1 file'
+	exit 1
+fi
+
+head -c "$cnt1" testmnt.txt | diff -u test1 -
+tail -c "$cnt3" testmnt.txt | diff -u test3 -
+cat test1 test2 test3 | diff -u - testmnt.txt
+
 ./umount.sh

umount.sh

@@ -1,2 +1,6 @@
+#!/bin/sh
+
+set -e
+
 fusermount -u testmnt.txt
 rm testmnt.txt