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diff --git a/tests/history7.sub b/tests/history7.sub
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+#   This program is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation, either version 3 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+# test history file truncation for various values of $HISTFILESIZE
+
+: ${THIS_SH:=./bash}
+: ${TMPDIR:=/var/tmp}
+
+export HISTTIMEFORMAT=
+export HISTFILESIZE=3
+export HISTFILE=$TMPDIR/hist-$$
+export PS1='$ '
+
+rm -f $HISTFILE
+
+# exactly the number of lines
+${THIS_SH} --norc -in <<<$'1\n2\n3' 
+wc -l < $HISTFILE
+
+rm -f $HISTFILE
+
+# truncating to fewer lines
+${THIS_SH} --norc -in <<<$'1\n2\n3\n4\n5' 
+wc -l < $HISTFILE
+
+rm -f $HISTFILE
+
+# the history file contains fewer lines than $HISTFILESIZE
+${THIS_SH} --norc -in <<<$'1\n2' 
+wc -l < $HISTFILE
+
+rm -f $HISTFILE
+
+# now we try it without timestamps
+unset HISTTIMEFORMAT
+
+# exactly the number of lines
+${THIS_SH} --norc -in <<<$'e 1\ne 2\ne 3' 
+wc -l < $HISTFILE
+cat $HISTFILE
+
+rm -f $HISTFILE
+
+# truncating to fewer lines
+${THIS_SH} --norc -in <<<$'x 1\nx 2\nx 3\nx 4\nx 5' 
+wc -l < $HISTFILE
+cat $HISTFILE
+
+rm -f $HISTFILE
+
+# the history file contains fewer lines than $HISTFILESIZE
+${THIS_SH} --norc -in <<<$'y 1\ny 2' 
+wc -l < $HISTFILE
+cat $HISTFILE
+
+rm -f $HISTFILE
+
+# we want to truncate the history file to zero length
+HISTFILESIZE=0
+${THIS_SH} --norc -in <<<$'1\n2' 
+wc -l < $HISTFILE
+
+rm -f $HISTFILE