following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+
+# Create and mount a filesystem for use in our tests
+unionfs_mkfs() {
+	local name=$1
+	local size=${2:-1}
+	# Create mountpoint
+	atf_check mkdir ${name}
+	# Create filesystem image
+	atf_check -e ignore dd if=/dev/zero of=${name}.img bs=1m count=${size}
+	echo ${name} >>imgs
+	# Create memory disk
+	atf_check -o save:${name}.md mdconfig ${name}.img
+	md=$(cat ${name}.md)
+	echo ${md} >>mds
+	# Format and mount filesystem
+	atf_check -o ignore newfs /dev/${md}
+	atf_check mount /dev/${md} ${name}
+	echo ${name} >>mounts
+}
+
+# Mount a unionfs
+unionfs_mount() {
+	local upper=$1
+	local lower=$2
+	# Mount upper over lower
+	atf_check mount -t unionfs ${upper} ${lower}
+	echo ${lower} >>mounts
+}
+
+# Clean up after a test
+unionfs_cleanup() {
+	# Unmount filesystems
+	if [ -f mounts ]; then
+		tail -r mounts | while read mount; do
+			umount ${mount} || true
+		done
+	fi
+	# Destroy memory disks
+	if [ -f mds ]; then
+		tail -r mds | while read md; do
+			mdconfig -d -u ${md} || true
+		done
+	fi
+	# Delete filesystem images and mountpoints
+	if [ -f imgs ]; then
+		tail -r imgs | while read name; do
+			rm -f ${name}.img || true
+			rmdir ${name} || true
+		done
+	fi
+}
+
+atf_test_case unionfs_basic cleanup
+unionfs_basic_head() {
+	atf_set "descr" "Basic function test"
+	atf_set "require.user" "root"
+	atf_set "require.kmods" "unionfs"
+}
+unionfs_basic_body() {
+	# Create upper and lower
+	unionfs_mkfs upper
+	unionfs_mkfs lower
+	# Mount upper over lower
+	unionfs_mount upper lower
+	# Create object on unionfs
+	atf_check touch upper/file
+	atf_check mkdir upper/dir
+	atf_check touch lower/dir/file
+	# Verify that objects were created on upper
+	atf_check test -f lower/file
+	atf_check test -d lower/dir
+	atf_check test -f upper/dir/file
+}
+unionfs_basic_cleanup() {
+	unionfs_cleanup
+}
+
+atf_test_case unionfs_exec cleanup
+unionfs_exec_head() {
+	atf_set "descr" "Test executing programs"
+	atf_set "require.user" "root"
+	atf_set "require.kmods" "unionfs"
+}
+unionfs_exec_body() {
+	# Create upper and copy a binary to it
+	unionfs_mkfs upper
+	atf_check cp -p /usr/bin/true upper/upper
+	# Create lower and copy a binary to it
+	unionfs_mkfs lower
+	atf_check cp -p /usr/bin/true lower/lower
+	# Mount upper over lower
+	unionfs_mount upper lower
+	# Execute both binaries
+	atf_check lower/lower
+	atf_check lower/upper
+}
+unionfs_exec_cleanup() {
+	unionfs_cleanup
+}
+
+atf_test_case unionfs_rename cleanup
+unionfs_rename_head() {
+	atf_set "descr" "Test renaming objects on lower"
+	atf_set "require.user" "root"
+	atf_set "require.kmods" "unionfs"
+}
+unionfs_rename_body() {
+	# Create upper and lower
+	unionfs_mkfs upper
+	unionfs_mkfs lower
+	# Create objects on lower
+	atf_check touch lower/file
+	atf_check mkdir lower/dir
+	atf_check ln -s dead lower/link
+	# Mount upper over lower
+	unionfs_mount upper lower
+	# Rename objects
+	atf_check mv lower/file lower/newfile
+	atf_check mv lower/dir lower/newdir
+	atf_check mv lower/link lower/newlink
+	# Verify that old names no longer exist
+	atf_check test ! -f lower/file
+	atf_check test ! -d lower/dir
+	atf_check test ! -L lower/link
+	# Verify that new names exist on upper
+	atf_check test -f upper/newfile
+	atf_check test -d upper/newdir
+	atf_check test -L upper/newlink
+}
+unionfs_rename_cleanup() {
+	unionfs_cleanup
+}
+
+atf_init_test_cases() {
+	atf_add_test_case unionfs_basic
+	atf_add_test_case unionfs_exec
+	atf_add_test_case unionfs_rename
+}