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diff --git a/tests/zfs-tests/tests/functional/cli_root/zfs_unload-key/zfs_unload-key_all.ksh b/tests/zfs-tests/tests/functional/cli_root/zfs_unload-key/zfs_unload-key_all.ksh
new file mode 100755
index 000000000000..ecb98d189424
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+++ b/tests/zfs-tests/tests/functional/cli_root/zfs_unload-key/zfs_unload-key_all.ksh
@@ -0,0 +1,76 @@
+#!/bin/ksh -p
+#
+# CDDL HEADER START
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+# CDDL HEADER END
+#
+
+#
+# Copyright (c) 2017 Datto, Inc. All rights reserved.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/cli_root/zfs_load-key/zfs_load-key_common.kshlib
+
+#
+# DESCRIPTION:
+# 'zfs unload-key -a' should unload keys for all datasets.
+#
+# STRATEGY:
+# 1. Create an encrypted filesystem, encrypted child dataset, an encrypted
+#    zvol, and an encrypted pool
+# 2. Unmount all datasets
+# 3. Attempt to unload all dataset keys
+# 4. Verify each dataset has its key unloaded
+# 5. Attempt to mount each dataset
+#
+
+verify_runnable "both"
+
+function cleanup
+{
+	datasetexists $TESTPOOL/$TESTFS1 && \
+		log_must zfs destroy -r $TESTPOOL/$TESTFS1
+	datasetexists $TESTPOOL/zvol && log_must zfs destroy $TESTPOOL/zvol
+	poolexists $TESTPOOL1 && log_must destroy_pool $TESTPOOL1
+}
+log_onexit cleanup
+
+log_assert "'zfs unload-key -a' should unload keys for all datasets"
+
+log_must eval "echo $PASSPHRASE1 > /$TESTPOOL/pkey"
+log_must zfs create -o encryption=on -o keyformat=passphrase \
+	-o keylocation=file:///$TESTPOOL/pkey $TESTPOOL/$TESTFS1
+log_must zfs create $TESTPOOL/$TESTFS1/child
+
+log_must zfs create -V 64M -o encryption=on -o keyformat=passphrase \
+	-o keylocation=file:///$TESTPOOL/pkey $TESTPOOL/zvol
+
+typeset DISK2="$(echo $DISKS | awk '{ print $2}')"
+log_must zpool create -O encryption=on -O keyformat=passphrase \
+	-O keylocation=file:///$TESTPOOL/pkey $TESTPOOL1 $DISK2
+
+log_must zfs unmount $TESTPOOL/$TESTFS1
+log_must zfs unmount $TESTPOOL1
+
+log_must zfs unload-key -a
+
+log_must key_unavailable $TESTPOOL/$TESTFS1
+log_must key_unavailable $TESTPOOL/$TESTFS1/child
+log_must key_unavailable $TESTPOOL/zvol
+log_must key_unavailable $TESTPOOL1
+
+log_mustnot zfs mount $TESTPOOL
+log_mustnot zfs mount $TESTPOOL/zvol
+log_mustnot zfs mount $TESTPOOL/$TESTFS1
+
+log_pass "'zfs unload-key -a' unloads keys for all datasets"