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diff --git a/tests/zfs-tests/tests/functional/truncate/truncate_001_pos.ksh b/tests/zfs-tests/tests/functional/truncate/truncate_001_pos.ksh
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+++ b/tests/zfs-tests/tests/functional/truncate/truncate_001_pos.ksh
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+#!/bin/ksh -p
+#
+# CDDL HEADER START
+#
+# The contents of this file are subject to the terms of the
+# Common Development and Distribution License (the "License").
+# You may not use this file except in compliance with the License.
+#
+# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+# or http://www.opensolaris.org/os/licensing.
+# See the License for the specific language governing permissions
+# and limitations under the License.
+#
+# When distributing Covered Code, include this CDDL HEADER in each
+# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+# If applicable, add the following below this CDDL HEADER, with the
+# fields enclosed by brackets "[]" replaced with your own identifying
+# information: Portions Copyright [yyyy] [name of copyright owner]
+#
+# CDDL HEADER END
+#
+
+#
+# Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
+# Use is subject to license terms.
+#
+
+#
+# Copyright (c) 2016 by Delphix. All rights reserved.
+#
+
+. $STF_SUITE/tests/functional/truncate/truncate.cfg
+. $STF_SUITE/include/libtest.shlib
+
+#
+# DESCRIPTION:
+# Tests file truncation within ZFS.
+#
+# STRATEGY:
+# 1. Open file
+# 2. Write random blocks in random places
+# 3. Truncate the file
+# 4. Repeat steps 2 and 3 lots of times
+# 5. Close the file.
+#
+
+verify_runnable "global"
+
+function cleanup
+{
+	[[ -e $TESTDIR ]] && log_must rm -rf $TESTDIR/*
+}
+
+log_assert "Ensure file with random blocks is truncated properly"
+
+options=""
+options_display="default options"
+
+log_onexit cleanup
+
+[[ -n "$TRUNC_FILESIZE" ]] && options=" $options -f $TRUNC_FILESIZE "
+
+[[ -n "$TRUNC_BLKSIZE" ]] && options="$options -b $TRUNC_BLKSIZE "
+
+[[ -n "$TRUNC_COUNT" ]] && options="$options -c $TRUNC_COUNT "
+
+[[ -n "$TRUNC_SEED" ]] && options="$options -s $TRUNC_SEED "
+
+[[ -n "$TRUNC_FILEOFFSET" ]] && options="$options -o $TRUNC_FILEOFFSET "
+
+[[ -n "$options" ]] && options_display=$options
+
+log_note "Invoking file_trunc with: $options_display"
+log_must file_trunc $options $TESTDIR/$TESTFILE
+
+typeset dir=$(get_device_dir $DISKS)
+verify_filesys "$TESTPOOL" "$TESTPOOL/$TESTFS" "$dir"
+
+log_pass "Random blocks have been truncated properly."