added test for checking for correct DST handling behaviour

tests/2_dst_handling/run.sh

@@ -0,0 +1,54 @@
+#!/bin/bash
+set -x
+
+# this test will check the behaviour arround a date where DST ends
+# with hourly, daily and monthly snapshots checked in a 15 minute interval
+
+# Daylight saving time 2017 in Europe/Vienna began at 02:00 on Sunday, 26 March
+# and ended at 03:00 on Sunday, 29 October. All times are in
+# Central European Time.
+
+. ../common/lib.sh
+
+POOL_NAME="sanoid-test-2"
+POOL_TARGET=""  # root
+RESULT="/tmp/sanoid_test_result"
+RESULT_CHECKSUM="a916d9cd46f4b80f285d069f3497d02671bbb1bfd12b43ef93531cbdaf89d55c"
+
+# UTC timestamp of start and end
+START="1509141600"
+END="1509400800"
+
+# prepare
+setup
+checkEnvironment
+disableTimeSync
+
+# set timezone
+ln -sf /usr/share/zoneinfo/Europe/Vienna /etc/localtime
+
+timestamp=$START
+
+mkdir -p "${POOL_TARGET}"
+truncate -s 512M "${POOL_TARGET}"/zpool2.img
+
+zpool create -f "${POOL_NAME}" "${POOL_TARGET}"/zpool2.img
+
+function cleanUp {
+  zpool export "${POOL_NAME}"
+}
+
+# export pool in any case
+trap cleanUp EXIT
+
+while [ $timestamp -le $END ]; do
+    date --utc --set @$timestamp; date; "${SANOID}" --cron --verbose
+    timestamp=$((timestamp+900))
+done
+
+saveSnapshotList "${POOL_NAME}" "${RESULT}"
+
+# hourly daily monthly
+verifySnapshotList "${RESULT}" 73 3 1 "${RESULT_CHECKSUM}"
+
+# one more hour because of DST

tests/2_dst_handling/sanoid.conf

@@ -0,0 +1,10 @@
+[sanoid-test-2]
+	use_template = production
+
+[template_production]
+	hourly = 36
+	daily = 30
+	monthly = 3
+	yearly = 0
+	autosnap = yes
+	autoprune = no