added test for force-delete flag

tests/syncoid/3_force_delete/run.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+
+# test replication with deletion of target if no matches are found
+
+set -x
+set -e
+
+. ../../common/lib.sh
+
+POOL_IMAGE="/tmp/syncoid-test-3.zpool"
+POOL_SIZE="200M"
+POOL_NAME="syncoid-test-3"
+TARGET_CHECKSUM="0409a2ac216e69971270817189cef7caa91f6306fad9eab1033955b7e7c6bd4c  -"
+
+truncate -s "${POOL_SIZE}" "${POOL_IMAGE}"
+
+zpool create -m none -f "${POOL_NAME}" "${POOL_IMAGE}"
+
+function cleanUp {
+  zpool export "${POOL_NAME}"
+}
+
+# export pool in any case
+trap cleanUp EXIT
+
+zfs create "${POOL_NAME}"/src
+zfs create "${POOL_NAME}"/src/1
+zfs create "${POOL_NAME}"/src/2
+zfs create "${POOL_NAME}"/src/3
+
+# initial replication
+../../../syncoid -r --debug --compress=none "${POOL_NAME}"/src "${POOL_NAME}"/dst
+# destroy last common snapshot on source
+zfs destroy "${POOL_NAME}"/src/2@%
+zfs snapshot "${POOL_NAME}"/src/2@test
+sleep 1
+../../../syncoid -r --force-delete --debug --compress=none "${POOL_NAME}"/src "${POOL_NAME}"/dst || exit 1
+
+# verify
+output=$(zfs list -t snapshot -r "${POOL_NAME}" -H -o name | sed 's/@syncoid_.*$'/@syncoid_/)
+checksum=$(echo "${output}" | sha256sum)
+
+if [ "${checksum}" != "${TARGET_CHECKSUM}" ]; then
+	exit 1
+fi
+
+exit 0