diff --git a/ci/build.sh b/ci/build.sh
index d7a6ada..14e73bb 100755
--- a/ci/build.sh
+++ b/ci/build.sh
@@ -87,6 +87,8 @@
 make -j${CI_PARALLEL_JOBS} --output-sync=target rootfs-czechlight-rauc
 mv images/update.raucb ~/zuul-output/artifacts/
 
+PATH="$PATH:$(pwd)/host/bin/" pytest -vv ${ZUUL_PROJECT_SRC_DIR}/tests/czechlight-cfg-fs/migrations.py
+
 if [[ "${ZUUL_JOB_NAME}" =~ clearfog ]]; then
     if [[ ${TRIGGERED_VIA_DEP} != 1 ]]; then
         # store a cached tarball as an artifact
diff --git a/doc/architecture.md b/doc/architecture.md
index 3abd868..c38cdfa 100644
--- a/doc/architecture.md
+++ b/doc/architecture.md
@@ -30,8 +30,9 @@
 The required modules (and configuration) is added in several steps:
 
 - the YANG modules for `netopeer2-server` are added via `netopeer2-install-yang.service` (via our Buildroot patches),
-- CzechLight-specific YANG modules and their initial data are added via [`czechlight-install-yang.service`](../package/czechlight-cfg-fs/czechlight-install-yang.service),
+- CzechLight-specific YANG modules are added via [`czechlight-install-yang.service`](../package/czechlight-cfg-fs/czechlight-install-yang.service),
 - system configuration is restored from the persistent location in `/cfg` via [`cfg-restore-sysrepo.service`](../package/czechlight-cfg-fs/cfg-restore-sysrepo.service),
+- migrations to system configuration are applied via [`czechlight-migrate.service`](../package/czechlight-cfg-fs/czechlight-migrate.service),
 - configuration of the Netopeer server gets re-checked via `netopeer2-setup.service` (once again in our Buildroot patches); this is needed especially during the first boot with no previous configuration to restore,
 - configuration of NACM is applied via [`nacm-restore.service`](../package/czechlight-cfg-fs/nacm-restore.service),
 - finally, any daemons that use sysrepo are started.
diff --git a/package/cla-sysrepo/cla-appliance.service.in b/package/cla-sysrepo/cla-appliance.service.in
index b3ef5b0..b01a7a1 100644
--- a/package/cla-sysrepo/cla-appliance.service.in
+++ b/package/cla-sysrepo/cla-appliance.service.in
@@ -1,9 +1,9 @@
 [Unit]
 Description=CzechLight __MODEL__ driver
-After=syslog.target network.target czechlight-install-yang.service cfg-restore-sysrepo.service nacm-restore.service
+After=syslog.target network.target cfg-restore-sysrepo.service czechlight-migrate.service nacm-restore.service
 Before=rauc-mark-good.service velia-hardware-g1.service velia-hardware-g2.service
 PartOf=netopeer2.service
-Requires=czechlight-install-yang.service cfg-restore-sysrepo.service nacm-restore.service
+Requires=cfg-restore-sysrepo.service czechlight-migrate.service nacm-restore.service
 StartLimitIntervalSec=0
 ConditionKernelCommandLine=|czechlight=__MODEL__
 ConditionKernelCommandLine=|czechlight=__MODEL__-g2
diff --git a/package/czechlight-cfg-fs/czechlight-cfg-fs.mk b/package/czechlight-cfg-fs/czechlight-cfg-fs.mk
index 775b088..5b21b97 100644
--- a/package/czechlight-cfg-fs/czechlight-cfg-fs.mk
+++ b/package/czechlight-cfg-fs/czechlight-cfg-fs.mk
@@ -62,6 +62,17 @@
 			$(TARGET_DIR)/usr/lib/systemd/system/
 		ln -sf ../cfg-restore-systemd-network.service $(TARGET_DIR)/usr/lib/systemd/system/network-pre.target.wants/
 	$(endif)
+
+	$(INSTALL) -D -m 0755 -t $(TARGET_DIR)/usr/libexec/czechlight-cfg-fs \
+		$(BR2_EXTERNAL_CZECHLIGHT_PATH)/package/czechlight-cfg-fs/czechlight-migrate.sh \
+		$(BR2_EXTERNAL_CZECHLIGHT_PATH)/package/czechlight-cfg-fs/czechlight-migration-list.sh
+
+	$(INSTALL) -D -m 0644 -t $(TARGET_DIR)/usr/libexec/czechlight-cfg-fs/migrations \
+		$(BR2_EXTERNAL_CZECHLIGHT_PATH)/package/czechlight-cfg-fs/migrations/*
+
+	$(INSTALL) -D -m 0644 -t $(TARGET_DIR)/usr/lib/systemd/system/ \
+		$(BR2_EXTERNAL_CZECHLIGHT_PATH)/package/czechlight-cfg-fs/czechlight-migrate.service
+	ln -sf ../czechlight-migrate.service $(TARGET_DIR)/usr/lib/systemd/system/multi-user.target.wants/
 endef
 
 # Configure OpenSSH to look for *user* keys in the /cfg
diff --git a/package/czechlight-cfg-fs/czechlight-install-yang.service b/package/czechlight-cfg-fs/czechlight-install-yang.service
index e34aee2..80e89fc 100644
--- a/package/czechlight-cfg-fs/czechlight-install-yang.service
+++ b/package/czechlight-cfg-fs/czechlight-install-yang.service
@@ -2,7 +2,7 @@
 Description=Install CzechLight YANG models
 After=netopeer2-install-yang.service cfg.mount
 Requires=netopeer2-install-yang.service cfg.mount
-Before=netopeer2.service cfg-restore-sysrepo.service
+Before=netopeer2.service cfg-restore-sysrepo.service czechlight-migrate.service
 
 [Service]
 Type=oneshot
diff --git a/package/czechlight-cfg-fs/czechlight-install-yang.sh b/package/czechlight-cfg-fs/czechlight-install-yang.sh
index 6c9f829..77c805d 100755
--- a/package/czechlight-cfg-fs/czechlight-install-yang.sh
+++ b/package/czechlight-cfg-fs/czechlight-install-yang.sh
@@ -58,23 +58,19 @@
         done
     fi
     sysrepoctl --search-dirs ${CLA_YANG} --install ${CLA_YANG}/czechlight-roadm-device@2021-03-05.yang ${FEATURE_ARGS} --permissions 0660
-    sysrepocfg --datastore=startup --format=json --module=czechlight-roadm-device --import="${CLA_YANG}/${INITIAL_DATA}.json"
 fi
 
 if [[ ${YANG_COHERENT} == 1 ]]; then
     sysrepoctl --search-dirs ${CLA_YANG} --install ${CLA_YANG}/czechlight-coherent-add-drop@2021-03-05.yang --permissions 0660
-    sysrepocfg --datastore=startup --format=json --module=czechlight-coherent-add-drop --new-data="${CLA_YANG}/${INITIAL_DATA}.json"
     sysrepoctl --change czechlight-coherent-add-drop --permissions 0660
 fi
 
 if [[ ${YANG_INLINE} == 1 ]]; then
     sysrepoctl --search-dirs ${CLA_YANG} --install ${CLA_YANG}/czechlight-inline-amp@2021-03-05.yang --permissions 0660
-    sysrepocfg --datastore=startup --format=json --module=czechlight-inline-amp --import="${CLA_YANG}/${INITIAL_DATA}.json"
 fi
 
 if [[ ${YANG_CALIBRATION} == 1 ]]; then
     sysrepoctl --search-dirs ${CLA_YANG} --install ${CLA_YANG}/czechlight-calibration-device@2019-06-25.yang --permissions 0660
-    sysrepocfg --datastore=startup --format=json --module=czechlight-calibration-device --import="${CLA_YANG}/${INITIAL_DATA}.json"
 fi
 
 sysrepoctl --search-dirs ${VELIA_YANG} --install ${VELIA_YANG}/ietf-system@2014-08-06.yang --permissions 0660
@@ -93,6 +89,3 @@
 
 sysrepoctl --search-dirs ${VELIA_YANG} --install ${VELIA_YANG}/czechlight-firewall@2021-01-25.yang --permissions 0600
 sysrepoctl --change ietf-access-control-list --enable-feature match-on-eth --enable-feature eth --enable-feature match-on-ipv4 --enable-feature ipv4 --enable-feature match-on-ipv6 --enable-feature ipv6 --enable-feature mixed-eth-ipv4-ipv6
-
-# If not do not copy here from startup -> running, running might be stale.
-sysrepocfg -C startup
diff --git a/package/czechlight-cfg-fs/czechlight-migrate.service b/package/czechlight-cfg-fs/czechlight-migrate.service
new file mode 100644
index 0000000..7e58d4d
--- /dev/null
+++ b/package/czechlight-cfg-fs/czechlight-migrate.service
@@ -0,0 +1,14 @@
+[Unit]
+Description=Migrate CzechLight YANG models startup data
+After=netopeer2-install-yang.service czechlight-install-yang.service cfg-restore-sysrepo.service cfg.mount
+Requires=netopeer2-install-yang.service czechlight-install-yang.service cfg-restore-sysrepo.service cfg.mount
+Before=netopeer2-setup.service netopeer2.service sysrepo-persistent-cfg.service
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/bin/bash /usr/libexec/czechlight-cfg-fs/czechlight-migrate.sh
+Group=sysrepo
+
+[Install]
+WantedBy=multi-user.target
diff --git a/package/czechlight-cfg-fs/czechlight-migrate.sh b/package/czechlight-cfg-fs/czechlight-migrate.sh
new file mode 100755
index 0000000..fd49f60
--- /dev/null
+++ b/package/czechlight-cfg-fs/czechlight-migrate.sh
@@ -0,0 +1,86 @@
+#!/bin/bash
+
+set -ex
+
+SCRIPT_ROOT=$(dirname $(realpath -s $0))
+MIGRATIONS=$SCRIPT_ROOT/czechlight-migration-list.sh
+export MIGRATIONS_DIRECTORY=${SCRIPT_ROOT}/migrations
+CFG_VERSION_FILE="${CFG_VERSION_FILE:-/cfg/sysrepo/version}"
+CFG_STARTUP_FILE="${CFG_STARTUP_FILE:-/cfg/sysrepo/startup.json}"
+PROC_CMDLINE="${PROC_CMDLINE:-/proc/cmdline}"
+
+export CLA_YANG="${CLA_YANG:-/usr/share/cla-sysrepo/yang}"
+export VELIA_YANG="${VELIA_YANG:-/usr/share/velia/yang}"
+
+# load migrations and perform a sanity check (filename's numerical prefix corresponds to the order in the MIGRATIONS array)
+source $MIGRATIONS
+for i in $(seq ${#MIGRATION_FILES[@]}); do
+    FILENAME=${MIGRATION_FILES[$(($i - 1))]}
+
+    if ! [[ "$FILENAME" =~ ^[0-9]{4}_.*.sh$ ]]; then
+        echo "Migration file '$FILENAME' has unexpected name"
+        exit 1
+    fi
+
+    FILE_REV=$(echo "$FILENAME" | grep -Eo "^[0-9]{4}")
+    if [[ $((FILE_REV + 0)) != $i ]]; then
+        echo "Migration filename '$FILENAME' hints revision $(($FILE_REV + 0)) but it is at position $i of the migration array"
+        exit 1
+    fi
+done
+
+for ARG in $(cat "$PROC_CMDLINE"); do
+    case "${ARG}" in
+        czechlight=*)
+            export CZECHLIGHT="${ARG:11}"
+            ;;
+    esac
+done
+
+case "${CZECHLIGHT}" in
+    sdn-roadm-line*)
+        export YANG_ROADM=1
+        ;;
+    sdn-roadm-add-drop*)
+        export YANG_ROADM=1
+        ;;
+    sdn-roadm-hires-add-drop*)
+        export YANG_ROADM=1
+        ;;
+    sdn-roadm-coherent-a-d*)
+        export YANG_COHERENT=1
+        ;;
+    sdn-inline*)
+        export YANG_INLINE=1
+        ;;
+    calibration-box)
+        export YANG_CALIBRATION=1
+        ;;
+esac
+
+
+# we might end up on the system
+# * that was created before the migrations were introduced; such system does not have ${CFG_VERSION_FILE}
+# * that was just created and freshly initialized with firmware; it has ${CFG_VERSION_FILE} but startup.json does not exist
+if [[ -r "$CFG_VERSION_FILE" && -f "$CFG_STARTUP_FILE" ]]; then
+    CURRENT_VERSION="$(cat ${CFG_VERSION_FILE})"
+else
+    CURRENT_VERSION=0
+fi
+
+if [[ ! "$CURRENT_VERSION" =~ ^[0-9]+$ ]]; then
+    echo "Invalid version '$CURRENT_VERSION'"
+    exit 1
+fi
+
+while [[ $CURRENT_VERSION -lt ${#MIGRATION_FILES[@]} ]]; do
+    /bin/bash ${SCRIPT_ROOT}/migrations/${MIGRATION_FILES[$CURRENT_VERSION]}
+    CURRENT_VERSION=$(($CURRENT_VERSION + 1))
+done
+
+# store current version and save startup.json
+sysrepocfg -d startup -f json -X > "$CFG_STARTUP_FILE"
+echo "$CURRENT_VERSION" > "$CFG_VERSION_FILE"
+
+# If not do not copy here from startup -> running, running might be stale.
+sysrepocfg -C startup
diff --git a/package/czechlight-cfg-fs/czechlight-migration-list.sh b/package/czechlight-cfg-fs/czechlight-migration-list.sh
new file mode 100644
index 0000000..9b5a49d
--- /dev/null
+++ b/package/czechlight-cfg-fs/czechlight-migration-list.sh
@@ -0,0 +1,5 @@
+MIGRATION_FILES=(
+    '0001_initial-data.sh'
+)
+
+
diff --git a/package/czechlight-cfg-fs/migrations/0001_initial-data.sh b/package/czechlight-cfg-fs/migrations/0001_initial-data.sh
new file mode 100644
index 0000000..8b81ccb
--- /dev/null
+++ b/package/czechlight-cfg-fs/migrations/0001_initial-data.sh
@@ -0,0 +1,30 @@
+#!/bin/bash
+
+# Load initial data
+# -----------------
+# These data are imported into the sysrepo's startup datastore only once. This happens either when the box is restored to
+# its factory settings (the box is new and boots for the first time or someone deletes the startup.json backup in /cfg)
+# or when the box is upgraded from the state before the migrations were introduced (versions released before July 2022).
+#
+# It's OK for user to remove these settings from sysrepo startup DS.
+# However, the data will NEVER get restored by us (unless somebody deletes /cfg/startup.json, see above).
+
+case "${CZECHLIGHT}" in
+    sdn-roadm-line*)
+        sysrepocfg --datastore=startup --format=json --module=czechlight-roadm-device --import="${CLA_YANG}/sdn-roadm-line.json"
+        ;;
+    sdn-roadm-add-drop*)
+        ;& # fallthrough
+    sdn-roadm-hires-add-drop*)
+        sysrepocfg --datastore=startup --format=json --module=czechlight-roadm-device --import="${CLA_YANG}/sdn-roadm-add-drop.json"
+        ;;
+    sdn-roadm-coherent-a-d*)
+        sysrepocfg --datastore=startup --format=json --module=czechlight-coherent-add-drop --import="${CLA_YANG}/sdn-roadm-coherent-a-d.json"
+        ;;
+    sdn-inline*)
+        sysrepocfg --datastore=startup --format=json --module=czechlight-inline-amp --import="${CLA_YANG}/sdn-inline.json"
+        ;;
+    calibration-box)
+        sysrepocfg --datastore=startup --format=json --module=czechlight-calibration-device --import="${CLA_YANG}/calibration-box.json"
+        ;;
+esac
diff --git a/package/czechlight-cfg-fs/nacm-restore.service b/package/czechlight-cfg-fs/nacm-restore.service
index 2cb3dec..4f5e5b9 100644
--- a/package/czechlight-cfg-fs/nacm-restore.service
+++ b/package/czechlight-cfg-fs/nacm-restore.service
@@ -1,7 +1,7 @@
 [Unit]
 Description=Restore NACM rules
-After=netopeer2-install-yang.service czechlight-install-yang.service cfg.mount
-Requires=netopeer2-install-yang.service czechlight-install-yang.service cfg.mount
+After=netopeer2-install-yang.service czechlight-migrate.service cfg.mount
+Requires=netopeer2-install-yang.service czechlight-migrate.service cfg.mount
 Before=netopeer2-setup.service netopeer2.service sysrepo-persistent-cfg.service
 
 [Service]
diff --git a/package/czechlight-cfg-fs/sysrepo-persistent-cfg.service b/package/czechlight-cfg-fs/sysrepo-persistent-cfg.service
index 007bd7b..25991f4 100644
--- a/package/czechlight-cfg-fs/sysrepo-persistent-cfg.service
+++ b/package/czechlight-cfg-fs/sysrepo-persistent-cfg.service
@@ -1,10 +1,11 @@
 [Unit]
 Description=Persisting persistent sysrepo datastores to /cfg
-After=netopeer2.service cfg.mount
-Requires=netopeer2.service cfg.mount
+After=netopeer2.service cfg.mount czechlight-migrate.service
+Requires=netopeer2.service cfg.mount czechlight-migrate.service
 
 [Service]
 Type=simple
 UMask=0077
-ExecStart=/bin/sh -c 'while true; do inotifywait -e CLOSE_WRITE /etc/sysrepo/data/*.startup && mkdir -p /cfg/sysrepo/ && sysrepocfg -d startup -f json -X > /cfg/sysrepo/startup.json; done'
+ExecStartPre=/bin/sh -c 'mkdir -p /cfg/sysrepo/ && sysrepocfg -d startup -f json -X > /cfg/sysrepo/startup.json'
+ExecStart=/bin/sh -c 'while true; do inotifywait -e CLOSE_WRITE /etc/sysrepo/data/*.startup && sysrepocfg -d startup -f json -X > /cfg/sysrepo/startup.json; done'
 Group=sysrepo
diff --git a/package/rousette/rousette.service b/package/rousette/rousette.service
index cb79d27..ba9efbb 100644
--- a/package/rousette/rousette.service
+++ b/package/rousette/rousette.service
@@ -1,8 +1,8 @@
 [Unit]
 Description=RESTCONFish server
-After=syslog.target network.target czechlight-install-yang.service cfg-restore-sysrepo.service nacm-restore.service
+After=syslog.target network.target cfg-restore-sysrepo.service czechlight-migrate.service nacm-restore.service
 PartOf=netopeer2.service
-Requires=czechlight-install-yang.service cfg-restore-sysrepo.service nacm-restore.service
+Requires=cfg-restore-sysrepo.service czechlight-migrate.service nacm-restore.service
 
 [Service]
 Type=simple
diff --git a/package/velia/velia-firewall.service b/package/velia/velia-firewall.service
index 1fdb318..e5dd1d6 100644
--- a/package/velia/velia-firewall.service
+++ b/package/velia/velia-firewall.service
@@ -1,9 +1,9 @@
 [Unit]
 Description=Firewall management via sysrepo
-After=syslog.target network.target czechlight-install-yang.service cfg-restore-sysrepo.service nacm-restore.service
+After=syslog.target network.target cfg-restore-sysrepo.service czechlight-migrate.service nacm-restore.service
 Before=rauc-mark-good.service
 PartOf=netopeer2.service
-Requires=czechlight-install-yang.service cfg-restore-sysrepo.service nacm-restore.service
+Requires=cfg-restore-sysrepo.service czechlight-migrate.service nacm-restore.service
 ConditionKernelCommandLine=czechlight
 
 [Service]
diff --git a/package/velia/velia-hardware-g1.service b/package/velia/velia-hardware-g1.service
index 6e09df3..cb0cd30 100644
--- a/package/velia/velia-hardware-g1.service
+++ b/package/velia/velia-hardware-g1.service
@@ -1,9 +1,9 @@
 [Unit]
 Description=Tracking hardware metrics
-After=syslog.target network.target czechlight-install-yang.service cfg-restore-sysrepo.service nacm-restore.service
+After=syslog.target network.target cfg-restore-sysrepo.service czechlight-migrate.service nacm-restore.service
 Before=rauc-mark-good.service
 PartOf=netopeer2.service
-Requires=czechlight-install-yang.service cfg-restore-sysrepo.service nacm-restore.service
+Requires=cfg-restore-sysrepo.service czechlight-migrate.service nacm-restore.service
 ConditionKernelCommandLine=|czechlight=sdn-inline
 ConditionKernelCommandLine=|czechlight=sdn-roadm-add-drop
 ConditionKernelCommandLine=|czechlight=sdn-roadm-coherent-a-d
diff --git a/package/velia/velia-hardware-g2.service b/package/velia/velia-hardware-g2.service
index 84342b7..8a58eab 100644
--- a/package/velia/velia-hardware-g2.service
+++ b/package/velia/velia-hardware-g2.service
@@ -1,9 +1,9 @@
 [Unit]
 Description=Tracking hardware metrics
-After=syslog.target network.target czechlight-install-yang.service cfg-restore-sysrepo.service nacm-restore.service
+After=syslog.target network.target cfg-restore-sysrepo.service czechlight-migrate.service nacm-restore.service
 Before=rauc-mark-good.service
 PartOf=netopeer2.service
-Requires=czechlight-install-yang.service cfg-restore-sysrepo.service nacm-restore.service
+Requires=cfg-restore-sysrepo.service czechlight-migrate.service nacm-restore.service
 ConditionKernelCommandLine=|czechlight=sdn-inline-g2
 ConditionKernelCommandLine=|czechlight=sdn-roadm-add-drop-g2
 ConditionKernelCommandLine=|czechlight=sdn-roadm-coherent-a-d-g2
diff --git a/package/velia/velia-system.service b/package/velia/velia-system.service
index 6963e91..113be5c 100644
--- a/package/velia/velia-system.service
+++ b/package/velia/velia-system.service
@@ -1,9 +1,9 @@
 [Unit]
 Description=System management via sysrepo
-After=syslog.target network.target czechlight-install-yang.service cfg-restore-sysrepo.service nacm-restore.service
+After=syslog.target network.target cfg-restore-sysrepo.service czechlight-migrate.service nacm-restore.service
 Before=rauc-mark-good.service
 PartOf=netopeer2.service
-Requires=czechlight-install-yang.service cfg-restore-sysrepo.service nacm-restore.service
+Requires=cfg-restore-sysrepo.service czechlight-migrate.service nacm-restore.service
 ConditionKernelCommandLine=czechlight
 
 [Service]
diff --git a/tests/czechlight-cfg-fs/data/v0_sdn-inline_empty/cmdline b/tests/czechlight-cfg-fs/data/v0_sdn-inline_empty/cmdline
new file mode 100644
index 0000000..7231fc3
--- /dev/null
+++ b/tests/czechlight-cfg-fs/data/v0_sdn-inline_empty/cmdline
@@ -0,0 +1 @@
+czechlight=sdn-inline-g2
diff --git a/tests/czechlight-cfg-fs/data/v0_sdn-inline_empty/expected.json b/tests/czechlight-cfg-fs/data/v0_sdn-inline_empty/expected.json
new file mode 100644
index 0000000..0967ef4
--- /dev/null
+++ b/tests/czechlight-cfg-fs/data/v0_sdn-inline_empty/expected.json
@@ -0,0 +1 @@
+{}
diff --git a/tests/czechlight-cfg-fs/data/v0_sdn-inline_empty/startup.json b/tests/czechlight-cfg-fs/data/v0_sdn-inline_empty/startup.json
new file mode 100644
index 0000000..2c63c08
--- /dev/null
+++ b/tests/czechlight-cfg-fs/data/v0_sdn-inline_empty/startup.json
@@ -0,0 +1,2 @@
+{
+}
diff --git a/tests/czechlight-cfg-fs/data/v0_sdn-inline_empty/version b/tests/czechlight-cfg-fs/data/v0_sdn-inline_empty/version
new file mode 100644
index 0000000..573541a
--- /dev/null
+++ b/tests/czechlight-cfg-fs/data/v0_sdn-inline_empty/version
@@ -0,0 +1 @@
+0
diff --git a/tests/czechlight-cfg-fs/data/v0_sdn-inline_somedata/cmdline b/tests/czechlight-cfg-fs/data/v0_sdn-inline_somedata/cmdline
new file mode 100644
index 0000000..17d977e
--- /dev/null
+++ b/tests/czechlight-cfg-fs/data/v0_sdn-inline_somedata/cmdline
@@ -0,0 +1 @@
+czechlight=sdn-inline
diff --git a/tests/czechlight-cfg-fs/data/v0_sdn-inline_somedata/expected.json b/tests/czechlight-cfg-fs/data/v0_sdn-inline_somedata/expected.json
new file mode 100644
index 0000000..52a1f53
--- /dev/null
+++ b/tests/czechlight-cfg-fs/data/v0_sdn-inline_somedata/expected.json
@@ -0,0 +1,113 @@
+{
+  "ietf-interfaces:interfaces": {
+    "interface": [
+      {
+        "name": "br0",
+        "type": "iana-if-type:bridge",
+        "ietf-ip:ipv4": {
+          "czechlight-network:dhcp-client": true
+        },
+        "ietf-ip:ipv6": {
+          "enabled": true,
+          "autoconf": {
+            "create-global-addresses": true
+          }
+        }
+      },
+      {
+        "name": "eth1",
+        "type": "iana-if-type:ethernetCsmacd",
+        "czechlight-network:bridge": "br0"
+      },
+      {
+        "name": "eth0",
+        "type": "iana-if-type:ethernetCsmacd",
+        "czechlight-network:bridge": "br0"
+      }
+    ]
+  },
+  "ietf-keystore:keystore": {
+    "asymmetric-keys": {
+      "asymmetric-key": [
+        {
+          "name": "genkey",
+          "algorithm": "rsa2048",
+          "public-key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAs/tnburJOGHcvSOKw7SdOfEvZD28WatHUfuWRCWZoElXtX1sNkBFXvRbKahOR8sZ221iRdlZ89bBVtTeX8N2wgPApy+Xi/9X1Icee2cU7QC7UfnNnWMW1C6WEZQS8zt+6IAQsOLk1AWyFeAN1EZQfjM/2UfxOW/kxXBu+MeVvdjouZYs73mW4OyV6VptMkAk4JDk5ieEp65p/rQOF0pIvpnu56nl9cybQ1s3DAQ76ZJP5qf8VdKS2WcBlS7UwXAMvXPM5TiIebnXtrF8jTd3S3ApOyZv00jxn/s5l6L1VA0p5HyB9W4DfNztINRyE56BEBvPeJePNWwNg+sVClLdmQIDAQAB",
+          "private-key": "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"
+        }
+      ]
+    }
+  },
+  "ietf-netconf-acm:nacm": {
+    "rule-list": [
+      {
+        "name": "Allow DWDM control to the optics group",
+        "group": [
+          "optics"
+        ],
+        "rule": [
+          {
+            "name": "czechlight-roadm-device",
+            "module-name": "czechlight-roadm-device",
+            "action": "permit"
+          },
+          {
+            "name": "czechlight-inline-amp",
+            "module-name": "czechlight-inline-amp",
+            "action": "permit"
+          },
+          {
+            "name": "czechlight-coherent-add-drop",
+            "module-name": "czechlight-coherent-add-drop",
+            "action": "permit"
+          },
+          {
+            "name": "czechlight-calibration-device",
+            "module-name": "czechlight-calibration-device",
+            "action": "permit"
+          }
+        ]
+      }
+    ]
+  },
+  "ietf-netconf-server:netconf-server": {
+    "listen": {
+      "endpoint": [
+        {
+          "name": "default-ssh",
+          "ssh": {
+            "tcp-server-parameters": {
+              "local-address": "::",
+              "keepalives": {
+                "idle-time": 1,
+                "max-probes": 10,
+                "probe-interval": 5
+              }
+            },
+            "ssh-server-parameters": {
+              "server-identity": {
+                "host-key": [
+                  {
+                    "name": "default-key",
+                    "public-key": {
+                      "keystore-reference": "genkey"
+                    }
+                  }
+                ]
+              },
+              "client-authentication": {
+                "supported-authentication-methods": {
+                  "publickey": [null],
+                  "passsword": [null],
+                  "other": [
+                    "interactive"
+                  ]
+                }
+              }
+            }
+          }
+        }
+      ]
+    }
+  }
+}
diff --git a/tests/czechlight-cfg-fs/data/v0_sdn-inline_somedata/startup.json b/tests/czechlight-cfg-fs/data/v0_sdn-inline_somedata/startup.json
new file mode 100644
index 0000000..52a1f53
--- /dev/null
+++ b/tests/czechlight-cfg-fs/data/v0_sdn-inline_somedata/startup.json
@@ -0,0 +1,113 @@
+{
+  "ietf-interfaces:interfaces": {
+    "interface": [
+      {
+        "name": "br0",
+        "type": "iana-if-type:bridge",
+        "ietf-ip:ipv4": {
+          "czechlight-network:dhcp-client": true
+        },
+        "ietf-ip:ipv6": {
+          "enabled": true,
+          "autoconf": {
+            "create-global-addresses": true
+          }
+        }
+      },
+      {
+        "name": "eth1",
+        "type": "iana-if-type:ethernetCsmacd",
+        "czechlight-network:bridge": "br0"
+      },
+      {
+        "name": "eth0",
+        "type": "iana-if-type:ethernetCsmacd",
+        "czechlight-network:bridge": "br0"
+      }
+    ]
+  },
+  "ietf-keystore:keystore": {
+    "asymmetric-keys": {
+      "asymmetric-key": [
+        {
+          "name": "genkey",
+          "algorithm": "rsa2048",
+          "public-key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAs/tnburJOGHcvSOKw7SdOfEvZD28WatHUfuWRCWZoElXtX1sNkBFXvRbKahOR8sZ221iRdlZ89bBVtTeX8N2wgPApy+Xi/9X1Icee2cU7QC7UfnNnWMW1C6WEZQS8zt+6IAQsOLk1AWyFeAN1EZQfjM/2UfxOW/kxXBu+MeVvdjouZYs73mW4OyV6VptMkAk4JDk5ieEp65p/rQOF0pIvpnu56nl9cybQ1s3DAQ76ZJP5qf8VdKS2WcBlS7UwXAMvXPM5TiIebnXtrF8jTd3S3ApOyZv00jxn/s5l6L1VA0p5HyB9W4DfNztINRyE56BEBvPeJePNWwNg+sVClLdmQIDAQAB",
+          "private-key": "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"
+        }
+      ]
+    }
+  },
+  "ietf-netconf-acm:nacm": {
+    "rule-list": [
+      {
+        "name": "Allow DWDM control to the optics group",
+        "group": [
+          "optics"
+        ],
+        "rule": [
+          {
+            "name": "czechlight-roadm-device",
+            "module-name": "czechlight-roadm-device",
+            "action": "permit"
+          },
+          {
+            "name": "czechlight-inline-amp",
+            "module-name": "czechlight-inline-amp",
+            "action": "permit"
+          },
+          {
+            "name": "czechlight-coherent-add-drop",
+            "module-name": "czechlight-coherent-add-drop",
+            "action": "permit"
+          },
+          {
+            "name": "czechlight-calibration-device",
+            "module-name": "czechlight-calibration-device",
+            "action": "permit"
+          }
+        ]
+      }
+    ]
+  },
+  "ietf-netconf-server:netconf-server": {
+    "listen": {
+      "endpoint": [
+        {
+          "name": "default-ssh",
+          "ssh": {
+            "tcp-server-parameters": {
+              "local-address": "::",
+              "keepalives": {
+                "idle-time": 1,
+                "max-probes": 10,
+                "probe-interval": 5
+              }
+            },
+            "ssh-server-parameters": {
+              "server-identity": {
+                "host-key": [
+                  {
+                    "name": "default-key",
+                    "public-key": {
+                      "keystore-reference": "genkey"
+                    }
+                  }
+                ]
+              },
+              "client-authentication": {
+                "supported-authentication-methods": {
+                  "publickey": [null],
+                  "passsword": [null],
+                  "other": [
+                    "interactive"
+                  ]
+                }
+              }
+            }
+          }
+        }
+      ]
+    }
+  }
+}
diff --git a/tests/czechlight-cfg-fs/data/v0_sdn-inline_somedata/version b/tests/czechlight-cfg-fs/data/v0_sdn-inline_somedata/version
new file mode 100644
index 0000000..573541a
--- /dev/null
+++ b/tests/czechlight-cfg-fs/data/v0_sdn-inline_somedata/version
@@ -0,0 +1 @@
+0
diff --git a/tests/czechlight-cfg-fs/data/v0_sdn-roadm-line_empty/cmdline b/tests/czechlight-cfg-fs/data/v0_sdn-roadm-line_empty/cmdline
new file mode 100644
index 0000000..6b1d906
--- /dev/null
+++ b/tests/czechlight-cfg-fs/data/v0_sdn-roadm-line_empty/cmdline
@@ -0,0 +1 @@
+czechlight=sdn-roadm-line
diff --git a/tests/czechlight-cfg-fs/data/v0_sdn-roadm-line_empty/expected.json b/tests/czechlight-cfg-fs/data/v0_sdn-roadm-line_empty/expected.json
new file mode 100644
index 0000000..4ab1a31
--- /dev/null
+++ b/tests/czechlight-cfg-fs/data/v0_sdn-roadm-line_empty/expected.json
@@ -0,0 +1,732 @@
+{
+  "czechlight-roadm-device:channel-plan": {
+    "channel": [
+      {
+        "name": "C-band",
+        "lower-frequency": "191325000",
+        "upper-frequency": "196125000"
+      },
+      {
+        "name": "13.5",
+        "lower-frequency": "191325000",
+        "upper-frequency": "191375000"
+      },
+      {
+        "name": "14.0",
+        "lower-frequency": "191375000",
+        "upper-frequency": "191425000"
+      },
+      {
+        "name": "14.5",
+        "lower-frequency": "191425000",
+        "upper-frequency": "191475000"
+      },
+      {
+        "name": "15.0",
+        "lower-frequency": "191475000",
+        "upper-frequency": "191525000"
+      },
+      {
+        "name": "15.5",
+        "lower-frequency": "191525000",
+        "upper-frequency": "191575000"
+      },
+      {
+        "name": "16.0",
+        "lower-frequency": "191575000",
+        "upper-frequency": "191625000"
+      },
+      {
+        "name": "16.5",
+        "lower-frequency": "191625000",
+        "upper-frequency": "191675000"
+      },
+      {
+        "name": "17.0",
+        "lower-frequency": "191675000",
+        "upper-frequency": "191725000"
+      },
+      {
+        "name": "17.5",
+        "lower-frequency": "191725000",
+        "upper-frequency": "191775000"
+      },
+      {
+        "name": "18.0",
+        "lower-frequency": "191775000",
+        "upper-frequency": "191825000"
+      },
+      {
+        "name": "18.5",
+        "lower-frequency": "191825000",
+        "upper-frequency": "191875000"
+      },
+      {
+        "name": "19.0",
+        "lower-frequency": "191875000",
+        "upper-frequency": "191925000"
+      },
+      {
+        "name": "19.5",
+        "lower-frequency": "191925000",
+        "upper-frequency": "191975000"
+      },
+      {
+        "name": "20.0",
+        "lower-frequency": "191975000",
+        "upper-frequency": "192025000"
+      },
+      {
+        "name": "20.5",
+        "lower-frequency": "192025000",
+        "upper-frequency": "192075000"
+      },
+      {
+        "name": "21.0",
+        "lower-frequency": "192075000",
+        "upper-frequency": "192125000"
+      },
+      {
+        "name": "21.5",
+        "lower-frequency": "192125000",
+        "upper-frequency": "192175000"
+      },
+      {
+        "name": "22.0",
+        "lower-frequency": "192175000",
+        "upper-frequency": "192225000"
+      },
+      {
+        "name": "22.5",
+        "lower-frequency": "192225000",
+        "upper-frequency": "192275000"
+      },
+      {
+        "name": "23.0",
+        "lower-frequency": "192275000",
+        "upper-frequency": "192325000"
+      },
+      {
+        "name": "23.5",
+        "lower-frequency": "192325000",
+        "upper-frequency": "192375000"
+      },
+      {
+        "name": "24.0",
+        "lower-frequency": "192375000",
+        "upper-frequency": "192425000"
+      },
+      {
+        "name": "24.5",
+        "lower-frequency": "192425000",
+        "upper-frequency": "192475000"
+      },
+      {
+        "name": "25.0",
+        "lower-frequency": "192475000",
+        "upper-frequency": "192525000"
+      },
+      {
+        "name": "25.5",
+        "lower-frequency": "192525000",
+        "upper-frequency": "192575000"
+      },
+      {
+        "name": "26.0",
+        "lower-frequency": "192575000",
+        "upper-frequency": "192625000"
+      },
+      {
+        "name": "26.5",
+        "lower-frequency": "192625000",
+        "upper-frequency": "192675000"
+      },
+      {
+        "name": "27.0",
+        "lower-frequency": "192675000",
+        "upper-frequency": "192725000"
+      },
+      {
+        "name": "27.5",
+        "lower-frequency": "192725000",
+        "upper-frequency": "192775000"
+      },
+      {
+        "name": "28.0",
+        "lower-frequency": "192775000",
+        "upper-frequency": "192825000"
+      },
+      {
+        "name": "28.5",
+        "lower-frequency": "192825000",
+        "upper-frequency": "192875000"
+      },
+      {
+        "name": "29.0",
+        "lower-frequency": "192875000",
+        "upper-frequency": "192925000"
+      },
+      {
+        "name": "29.5",
+        "lower-frequency": "192925000",
+        "upper-frequency": "192975000"
+      },
+      {
+        "name": "30.0",
+        "lower-frequency": "192975000",
+        "upper-frequency": "193025000"
+      },
+      {
+        "name": "30.5",
+        "lower-frequency": "193025000",
+        "upper-frequency": "193075000"
+      },
+      {
+        "name": "31.0",
+        "lower-frequency": "193075000",
+        "upper-frequency": "193125000"
+      },
+      {
+        "name": "31.5",
+        "lower-frequency": "193125000",
+        "upper-frequency": "193175000"
+      },
+      {
+        "name": "32.0",
+        "lower-frequency": "193175000",
+        "upper-frequency": "193225000"
+      },
+      {
+        "name": "32.5",
+        "lower-frequency": "193225000",
+        "upper-frequency": "193275000"
+      },
+      {
+        "name": "33.0",
+        "lower-frequency": "193275000",
+        "upper-frequency": "193325000"
+      },
+      {
+        "name": "33.5",
+        "lower-frequency": "193325000",
+        "upper-frequency": "193375000"
+      },
+      {
+        "name": "34.0",
+        "lower-frequency": "193375000",
+        "upper-frequency": "193425000"
+      },
+      {
+        "name": "34.5",
+        "lower-frequency": "193425000",
+        "upper-frequency": "193475000"
+      },
+      {
+        "name": "35.0",
+        "lower-frequency": "193475000",
+        "upper-frequency": "193525000"
+      },
+      {
+        "name": "35.5",
+        "lower-frequency": "193525000",
+        "upper-frequency": "193575000"
+      },
+      {
+        "name": "36.0",
+        "lower-frequency": "193575000",
+        "upper-frequency": "193625000"
+      },
+      {
+        "name": "36.5",
+        "lower-frequency": "193625000",
+        "upper-frequency": "193675000"
+      },
+      {
+        "name": "37.0",
+        "lower-frequency": "193675000",
+        "upper-frequency": "193725000"
+      },
+      {
+        "name": "37.5",
+        "lower-frequency": "193725000",
+        "upper-frequency": "193775000"
+      },
+      {
+        "name": "38.0",
+        "lower-frequency": "193775000",
+        "upper-frequency": "193825000"
+      },
+      {
+        "name": "38.5",
+        "lower-frequency": "193825000",
+        "upper-frequency": "193875000"
+      },
+      {
+        "name": "39.0",
+        "lower-frequency": "193875000",
+        "upper-frequency": "193925000"
+      },
+      {
+        "name": "39.5",
+        "lower-frequency": "193925000",
+        "upper-frequency": "193975000"
+      },
+      {
+        "name": "40.0",
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+        "upper-frequency": "194025000"
+      },
+      {
+        "name": "40.5",
+        "lower-frequency": "194025000",
+        "upper-frequency": "194075000"
+      },
+      {
+        "name": "41.0",
+        "lower-frequency": "194075000",
+        "upper-frequency": "194125000"
+      },
+      {
+        "name": "41.5",
+        "lower-frequency": "194125000",
+        "upper-frequency": "194175000"
+      },
+      {
+        "name": "42.0",
+        "lower-frequency": "194175000",
+        "upper-frequency": "194225000"
+      },
+      {
+        "name": "42.5",
+        "lower-frequency": "194225000",
+        "upper-frequency": "194275000"
+      },
+      {
+        "name": "43.0",
+        "lower-frequency": "194275000",
+        "upper-frequency": "194325000"
+      },
+      {
+        "name": "43.5",
+        "lower-frequency": "194325000",
+        "upper-frequency": "194375000"
+      },
+      {
+        "name": "44.0",
+        "lower-frequency": "194375000",
+        "upper-frequency": "194425000"
+      },
+      {
+        "name": "44.5",
+        "lower-frequency": "194425000",
+        "upper-frequency": "194475000"
+      },
+      {
+        "name": "45.0",
+        "lower-frequency": "194475000",
+        "upper-frequency": "194525000"
+      },
+      {
+        "name": "45.5",
+        "lower-frequency": "194525000",
+        "upper-frequency": "194575000"
+      },
+      {
+        "name": "46.0",
+        "lower-frequency": "194575000",
+        "upper-frequency": "194625000"
+      },
+      {
+        "name": "46.5",
+        "lower-frequency": "194625000",
+        "upper-frequency": "194675000"
+      },
+      {
+        "name": "47.0",
+        "lower-frequency": "194675000",
+        "upper-frequency": "194725000"
+      },
+      {
+        "name": "47.5",
+        "lower-frequency": "194725000",
+        "upper-frequency": "194775000"
+      },
+      {
+        "name": "48.0",
+        "lower-frequency": "194775000",
+        "upper-frequency": "194825000"
+      },
+      {
+        "name": "48.5",
+        "lower-frequency": "194825000",
+        "upper-frequency": "194875000"
+      },
+      {
+        "name": "49.0",
+        "lower-frequency": "194875000",
+        "upper-frequency": "194925000"
+      },
+      {
+        "name": "49.5",
+        "lower-frequency": "194925000",
+        "upper-frequency": "194975000"
+      },
+      {
+        "name": "50.0",
+        "lower-frequency": "194975000",
+        "upper-frequency": "195025000"
+      },
+      {
+        "name": "50.5",
+        "lower-frequency": "195025000",
+        "upper-frequency": "195075000"
+      },
+      {
+        "name": "51.0",
+        "lower-frequency": "195075000",
+        "upper-frequency": "195125000"
+      },
+      {
+        "name": "51.5",
+        "lower-frequency": "195125000",
+        "upper-frequency": "195175000"
+      },
+      {
+        "name": "52.0",
+        "lower-frequency": "195175000",
+        "upper-frequency": "195225000"
+      },
+      {
+        "name": "52.5",
+        "lower-frequency": "195225000",
+        "upper-frequency": "195275000"
+      },
+      {
+        "name": "53.0",
+        "lower-frequency": "195275000",
+        "upper-frequency": "195325000"
+      },
+      {
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+        "lower-frequency": "195325000",
+        "upper-frequency": "195375000"
+      },
+      {
+        "name": "54.0",
+        "lower-frequency": "195375000",
+        "upper-frequency": "195425000"
+      },
+      {
+        "name": "54.5",
+        "lower-frequency": "195425000",
+        "upper-frequency": "195475000"
+      },
+      {
+        "name": "55.0",
+        "lower-frequency": "195475000",
+        "upper-frequency": "195525000"
+      },
+      {
+        "name": "55.5",
+        "lower-frequency": "195525000",
+        "upper-frequency": "195575000"
+      },
+      {
+        "name": "56.0",
+        "lower-frequency": "195575000",
+        "upper-frequency": "195625000"
+      },
+      {
+        "name": "56.5",
+        "lower-frequency": "195625000",
+        "upper-frequency": "195675000"
+      },
+      {
+        "name": "57.0",
+        "lower-frequency": "195675000",
+        "upper-frequency": "195725000"
+      },
+      {
+        "name": "57.5",
+        "lower-frequency": "195725000",
+        "upper-frequency": "195775000"
+      },
+      {
+        "name": "58.0",
+        "lower-frequency": "195775000",
+        "upper-frequency": "195825000"
+      },
+      {
+        "name": "58.5",
+        "lower-frequency": "195825000",
+        "upper-frequency": "195875000"
+      },
+      {
+        "name": "59.0",
+        "lower-frequency": "195875000",
+        "upper-frequency": "195925000"
+      },
+      {
+        "name": "59.5",
+        "lower-frequency": "195925000",
+        "upper-frequency": "195975000"
+      },
+      {
+        "name": "60.0",
+        "lower-frequency": "195975000",
+        "upper-frequency": "196025000"
+      },
+      {
+        "name": "60.5",
+        "lower-frequency": "196025000",
+        "upper-frequency": "196075000"
+      },
+      {
+        "name": "61.0",
+        "lower-frequency": "196075000",
+        "upper-frequency": "196125000"
+      },
+      {
+        "name": "14 (100GHz)",
+        "lower-frequency": "191350000",
+        "upper-frequency": "191450000"
+      },
+      {
+        "name": "15 (100GHz)",
+        "lower-frequency": "191450000",
+        "upper-frequency": "191550000"
+      },
+      {
+        "name": "16 (100GHz)",
+        "lower-frequency": "191550000",
+        "upper-frequency": "191650000"
+      },
+      {
+        "name": "17 (100GHz)",
+        "lower-frequency": "191650000",
+        "upper-frequency": "191750000"
+      },
+      {
+        "name": "18 (100GHz)",
+        "lower-frequency": "191750000",
+        "upper-frequency": "191850000"
+      },
+      {
+        "name": "19 (100GHz)",
+        "lower-frequency": "191850000",
+        "upper-frequency": "191950000"
+      },
+      {
+        "name": "20 (100GHz)",
+        "lower-frequency": "191950000",
+        "upper-frequency": "192050000"
+      },
+      {
+        "name": "21 (100GHz)",
+        "lower-frequency": "192050000",
+        "upper-frequency": "192150000"
+      },
+      {
+        "name": "22 (100GHz)",
+        "lower-frequency": "192150000",
+        "upper-frequency": "192250000"
+      },
+      {
+        "name": "23 (100GHz)",
+        "lower-frequency": "192250000",
+        "upper-frequency": "192350000"
+      },
+      {
+        "name": "24 (100GHz)",
+        "lower-frequency": "192350000",
+        "upper-frequency": "192450000"
+      },
+      {
+        "name": "25 (100GHz)",
+        "lower-frequency": "192450000",
+        "upper-frequency": "192550000"
+      },
+      {
+        "name": "26 (100GHz)",
+        "lower-frequency": "192550000",
+        "upper-frequency": "192650000"
+      },
+      {
+        "name": "27 (100GHz)",
+        "lower-frequency": "192650000",
+        "upper-frequency": "192750000"
+      },
+      {
+        "name": "28 (100GHz)",
+        "lower-frequency": "192750000",
+        "upper-frequency": "192850000"
+      },
+      {
+        "name": "29 (100GHz)",
+        "lower-frequency": "192850000",
+        "upper-frequency": "192950000"
+      },
+      {
+        "name": "30 (100GHz)",
+        "lower-frequency": "192950000",
+        "upper-frequency": "193050000"
+      },
+      {
+        "name": "31 (100GHz)",
+        "lower-frequency": "193050000",
+        "upper-frequency": "193150000"
+      },
+      {
+        "name": "32 (100GHz)",
+        "lower-frequency": "193150000",
+        "upper-frequency": "193250000"
+      },
+      {
+        "name": "33 (100GHz)",
+        "lower-frequency": "193250000",
+        "upper-frequency": "193350000"
+      },
+      {
+        "name": "34 (100GHz)",
+        "lower-frequency": "193350000",
+        "upper-frequency": "193450000"
+      },
+      {
+        "name": "35 (100GHz)",
+        "lower-frequency": "193450000",
+        "upper-frequency": "193550000"
+      },
+      {
+        "name": "36 (100GHz)",
+        "lower-frequency": "193550000",
+        "upper-frequency": "193650000"
+      },
+      {
+        "name": "37 (100GHz)",
+        "lower-frequency": "193650000",
+        "upper-frequency": "193750000"
+      },
+      {
+        "name": "38 (100GHz)",
+        "lower-frequency": "193750000",
+        "upper-frequency": "193850000"
+      },
+      {
+        "name": "39 (100GHz)",
+        "lower-frequency": "193850000",
+        "upper-frequency": "193950000"
+      },
+      {
+        "name": "40 (100GHz)",
+        "lower-frequency": "193950000",
+        "upper-frequency": "194050000"
+      },
+      {
+        "name": "41 (100GHz)",
+        "lower-frequency": "194050000",
+        "upper-frequency": "194150000"
+      },
+      {
+        "name": "42 (100GHz)",
+        "lower-frequency": "194150000",
+        "upper-frequency": "194250000"
+      },
+      {
+        "name": "43 (100GHz)",
+        "lower-frequency": "194250000",
+        "upper-frequency": "194350000"
+      },
+      {
+        "name": "44 (100GHz)",
+        "lower-frequency": "194350000",
+        "upper-frequency": "194450000"
+      },
+      {
+        "name": "45 (100GHz)",
+        "lower-frequency": "194450000",
+        "upper-frequency": "194550000"
+      },
+      {
+        "name": "46 (100GHz)",
+        "lower-frequency": "194550000",
+        "upper-frequency": "194650000"
+      },
+      {
+        "name": "47 (100GHz)",
+        "lower-frequency": "194650000",
+        "upper-frequency": "194750000"
+      },
+      {
+        "name": "48 (100GHz)",
+        "lower-frequency": "194750000",
+        "upper-frequency": "194850000"
+      },
+      {
+        "name": "49 (100GHz)",
+        "lower-frequency": "194850000",
+        "upper-frequency": "194950000"
+      },
+      {
+        "name": "50 (100GHz)",
+        "lower-frequency": "194950000",
+        "upper-frequency": "195050000"
+      },
+      {
+        "name": "51 (100GHz)",
+        "lower-frequency": "195050000",
+        "upper-frequency": "195150000"
+      },
+      {
+        "name": "52 (100GHz)",
+        "lower-frequency": "195150000",
+        "upper-frequency": "195250000"
+      },
+      {
+        "name": "53 (100GHz)",
+        "lower-frequency": "195250000",
+        "upper-frequency": "195350000"
+      },
+      {
+        "name": "54 (100GHz)",
+        "lower-frequency": "195350000",
+        "upper-frequency": "195450000"
+      },
+      {
+        "name": "55 (100GHz)",
+        "lower-frequency": "195450000",
+        "upper-frequency": "195550000"
+      },
+      {
+        "name": "56 (100GHz)",
+        "lower-frequency": "195550000",
+        "upper-frequency": "195650000"
+      },
+      {
+        "name": "57 (100GHz)",
+        "lower-frequency": "195650000",
+        "upper-frequency": "195750000"
+      },
+      {
+        "name": "58 (100GHz)",
+        "lower-frequency": "195750000",
+        "upper-frequency": "195850000"
+      },
+      {
+        "name": "59 (100GHz)",
+        "lower-frequency": "195850000",
+        "upper-frequency": "195950000"
+      },
+      {
+        "name": "60 (100GHz)",
+        "lower-frequency": "195950000",
+        "upper-frequency": "196050000"
+      }
+    ]
+  },
+  "czechlight-roadm-device:media-channels": [
+    {
+      "channel": "C-band",
+      "description": "Whole-band overview"
+    }
+  ]
+}
diff --git a/tests/czechlight-cfg-fs/data/v0_sdn-roadm-line_empty/startup.json b/tests/czechlight-cfg-fs/data/v0_sdn-roadm-line_empty/startup.json
new file mode 100644
index 0000000..2c63c08
--- /dev/null
+++ b/tests/czechlight-cfg-fs/data/v0_sdn-roadm-line_empty/startup.json
@@ -0,0 +1,2 @@
+{
+}
diff --git a/tests/czechlight-cfg-fs/data/v0_sdn-roadm-line_empty/version b/tests/czechlight-cfg-fs/data/v0_sdn-roadm-line_empty/version
new file mode 100644
index 0000000..573541a
--- /dev/null
+++ b/tests/czechlight-cfg-fs/data/v0_sdn-roadm-line_empty/version
@@ -0,0 +1 @@
+0
diff --git a/tests/czechlight-cfg-fs/data/v0_sdn-roadm-line_with_altered_initial_data/cmdline b/tests/czechlight-cfg-fs/data/v0_sdn-roadm-line_with_altered_initial_data/cmdline
new file mode 100644
index 0000000..6b1d906
--- /dev/null
+++ b/tests/czechlight-cfg-fs/data/v0_sdn-roadm-line_with_altered_initial_data/cmdline
@@ -0,0 +1 @@
+czechlight=sdn-roadm-line
diff --git a/tests/czechlight-cfg-fs/data/v0_sdn-roadm-line_with_altered_initial_data/expected.json b/tests/czechlight-cfg-fs/data/v0_sdn-roadm-line_with_altered_initial_data/expected.json
new file mode 100644
index 0000000..4ab1a31
--- /dev/null
+++ b/tests/czechlight-cfg-fs/data/v0_sdn-roadm-line_with_altered_initial_data/expected.json
@@ -0,0 +1,732 @@
+{
+  "czechlight-roadm-device:channel-plan": {
+    "channel": [
+      {
+        "name": "C-band",
+        "lower-frequency": "191325000",
+        "upper-frequency": "196125000"
+      },
+      {
+        "name": "13.5",
+        "lower-frequency": "191325000",
+        "upper-frequency": "191375000"
+      },
+      {
+        "name": "14.0",
+        "lower-frequency": "191375000",
+        "upper-frequency": "191425000"
+      },
+      {
+        "name": "14.5",
+        "lower-frequency": "191425000",
+        "upper-frequency": "191475000"
+      },
+      {
+        "name": "15.0",
+        "lower-frequency": "191475000",
+        "upper-frequency": "191525000"
+      },
+      {
+        "name": "15.5",
+        "lower-frequency": "191525000",
+        "upper-frequency": "191575000"
+      },
+      {
+        "name": "16.0",
+        "lower-frequency": "191575000",
+        "upper-frequency": "191625000"
+      },
+      {
+        "name": "16.5",
+        "lower-frequency": "191625000",
+        "upper-frequency": "191675000"
+      },
+      {
+        "name": "17.0",
+        "lower-frequency": "191675000",
+        "upper-frequency": "191725000"
+      },
+      {
+        "name": "17.5",
+        "lower-frequency": "191725000",
+        "upper-frequency": "191775000"
+      },
+      {
+        "name": "18.0",
+        "lower-frequency": "191775000",
+        "upper-frequency": "191825000"
+      },
+      {
+        "name": "18.5",
+        "lower-frequency": "191825000",
+        "upper-frequency": "191875000"
+      },
+      {
+        "name": "19.0",
+        "lower-frequency": "191875000",
+        "upper-frequency": "191925000"
+      },
+      {
+        "name": "19.5",
+        "lower-frequency": "191925000",
+        "upper-frequency": "191975000"
+      },
+      {
+        "name": "20.0",
+        "lower-frequency": "191975000",
+        "upper-frequency": "192025000"
+      },
+      {
+        "name": "20.5",
+        "lower-frequency": "192025000",
+        "upper-frequency": "192075000"
+      },
+      {
+        "name": "21.0",
+        "lower-frequency": "192075000",
+        "upper-frequency": "192125000"
+      },
+      {
+        "name": "21.5",
+        "lower-frequency": "192125000",
+        "upper-frequency": "192175000"
+      },
+      {
+        "name": "22.0",
+        "lower-frequency": "192175000",
+        "upper-frequency": "192225000"
+      },
+      {
+        "name": "22.5",
+        "lower-frequency": "192225000",
+        "upper-frequency": "192275000"
+      },
+      {
+        "name": "23.0",
+        "lower-frequency": "192275000",
+        "upper-frequency": "192325000"
+      },
+      {
+        "name": "23.5",
+        "lower-frequency": "192325000",
+        "upper-frequency": "192375000"
+      },
+      {
+        "name": "24.0",
+        "lower-frequency": "192375000",
+        "upper-frequency": "192425000"
+      },
+      {
+        "name": "24.5",
+        "lower-frequency": "192425000",
+        "upper-frequency": "192475000"
+      },
+      {
+        "name": "25.0",
+        "lower-frequency": "192475000",
+        "upper-frequency": "192525000"
+      },
+      {
+        "name": "25.5",
+        "lower-frequency": "192525000",
+        "upper-frequency": "192575000"
+      },
+      {
+        "name": "26.0",
+        "lower-frequency": "192575000",
+        "upper-frequency": "192625000"
+      },
+      {
+        "name": "26.5",
+        "lower-frequency": "192625000",
+        "upper-frequency": "192675000"
+      },
+      {
+        "name": "27.0",
+        "lower-frequency": "192675000",
+        "upper-frequency": "192725000"
+      },
+      {
+        "name": "27.5",
+        "lower-frequency": "192725000",
+        "upper-frequency": "192775000"
+      },
+      {
+        "name": "28.0",
+        "lower-frequency": "192775000",
+        "upper-frequency": "192825000"
+      },
+      {
+        "name": "28.5",
+        "lower-frequency": "192825000",
+        "upper-frequency": "192875000"
+      },
+      {
+        "name": "29.0",
+        "lower-frequency": "192875000",
+        "upper-frequency": "192925000"
+      },
+      {
+        "name": "29.5",
+        "lower-frequency": "192925000",
+        "upper-frequency": "192975000"
+      },
+      {
+        "name": "30.0",
+        "lower-frequency": "192975000",
+        "upper-frequency": "193025000"
+      },
+      {
+        "name": "30.5",
+        "lower-frequency": "193025000",
+        "upper-frequency": "193075000"
+      },
+      {
+        "name": "31.0",
+        "lower-frequency": "193075000",
+        "upper-frequency": "193125000"
+      },
+      {
+        "name": "31.5",
+        "lower-frequency": "193125000",
+        "upper-frequency": "193175000"
+      },
+      {
+        "name": "32.0",
+        "lower-frequency": "193175000",
+        "upper-frequency": "193225000"
+      },
+      {
+        "name": "32.5",
+        "lower-frequency": "193225000",
+        "upper-frequency": "193275000"
+      },
+      {
+        "name": "33.0",
+        "lower-frequency": "193275000",
+        "upper-frequency": "193325000"
+      },
+      {
+        "name": "33.5",
+        "lower-frequency": "193325000",
+        "upper-frequency": "193375000"
+      },
+      {
+        "name": "34.0",
+        "lower-frequency": "193375000",
+        "upper-frequency": "193425000"
+      },
+      {
+        "name": "34.5",
+        "lower-frequency": "193425000",
+        "upper-frequency": "193475000"
+      },
+      {
+        "name": "35.0",
+        "lower-frequency": "193475000",
+        "upper-frequency": "193525000"
+      },
+      {
+        "name": "35.5",
+        "lower-frequency": "193525000",
+        "upper-frequency": "193575000"
+      },
+      {
+        "name": "36.0",
+        "lower-frequency": "193575000",
+        "upper-frequency": "193625000"
+      },
+      {
+        "name": "36.5",
+        "lower-frequency": "193625000",
+        "upper-frequency": "193675000"
+      },
+      {
+        "name": "37.0",
+        "lower-frequency": "193675000",
+        "upper-frequency": "193725000"
+      },
+      {
+        "name": "37.5",
+        "lower-frequency": "193725000",
+        "upper-frequency": "193775000"
+      },
+      {
+        "name": "38.0",
+        "lower-frequency": "193775000",
+        "upper-frequency": "193825000"
+      },
+      {
+        "name": "38.5",
+        "lower-frequency": "193825000",
+        "upper-frequency": "193875000"
+      },
+      {
+        "name": "39.0",
+        "lower-frequency": "193875000",
+        "upper-frequency": "193925000"
+      },
+      {
+        "name": "39.5",
+        "lower-frequency": "193925000",
+        "upper-frequency": "193975000"
+      },
+      {
+        "name": "40.0",
+        "lower-frequency": "193975000",
+        "upper-frequency": "194025000"
+      },
+      {
+        "name": "40.5",
+        "lower-frequency": "194025000",
+        "upper-frequency": "194075000"
+      },
+      {
+        "name": "41.0",
+        "lower-frequency": "194075000",
+        "upper-frequency": "194125000"
+      },
+      {
+        "name": "41.5",
+        "lower-frequency": "194125000",
+        "upper-frequency": "194175000"
+      },
+      {
+        "name": "42.0",
+        "lower-frequency": "194175000",
+        "upper-frequency": "194225000"
+      },
+      {
+        "name": "42.5",
+        "lower-frequency": "194225000",
+        "upper-frequency": "194275000"
+      },
+      {
+        "name": "43.0",
+        "lower-frequency": "194275000",
+        "upper-frequency": "194325000"
+      },
+      {
+        "name": "43.5",
+        "lower-frequency": "194325000",
+        "upper-frequency": "194375000"
+      },
+      {
+        "name": "44.0",
+        "lower-frequency": "194375000",
+        "upper-frequency": "194425000"
+      },
+      {
+        "name": "44.5",
+        "lower-frequency": "194425000",
+        "upper-frequency": "194475000"
+      },
+      {
+        "name": "45.0",
+        "lower-frequency": "194475000",
+        "upper-frequency": "194525000"
+      },
+      {
+        "name": "45.5",
+        "lower-frequency": "194525000",
+        "upper-frequency": "194575000"
+      },
+      {
+        "name": "46.0",
+        "lower-frequency": "194575000",
+        "upper-frequency": "194625000"
+      },
+      {
+        "name": "46.5",
+        "lower-frequency": "194625000",
+        "upper-frequency": "194675000"
+      },
+      {
+        "name": "47.0",
+        "lower-frequency": "194675000",
+        "upper-frequency": "194725000"
+      },
+      {
+        "name": "47.5",
+        "lower-frequency": "194725000",
+        "upper-frequency": "194775000"
+      },
+      {
+        "name": "48.0",
+        "lower-frequency": "194775000",
+        "upper-frequency": "194825000"
+      },
+      {
+        "name": "48.5",
+        "lower-frequency": "194825000",
+        "upper-frequency": "194875000"
+      },
+      {
+        "name": "49.0",
+        "lower-frequency": "194875000",
+        "upper-frequency": "194925000"
+      },
+      {
+        "name": "49.5",
+        "lower-frequency": "194925000",
+        "upper-frequency": "194975000"
+      },
+      {
+        "name": "50.0",
+        "lower-frequency": "194975000",
+        "upper-frequency": "195025000"
+      },
+      {
+        "name": "50.5",
+        "lower-frequency": "195025000",
+        "upper-frequency": "195075000"
+      },
+      {
+        "name": "51.0",
+        "lower-frequency": "195075000",
+        "upper-frequency": "195125000"
+      },
+      {
+        "name": "51.5",
+        "lower-frequency": "195125000",
+        "upper-frequency": "195175000"
+      },
+      {
+        "name": "52.0",
+        "lower-frequency": "195175000",
+        "upper-frequency": "195225000"
+      },
+      {
+        "name": "52.5",
+        "lower-frequency": "195225000",
+        "upper-frequency": "195275000"
+      },
+      {
+        "name": "53.0",
+        "lower-frequency": "195275000",
+        "upper-frequency": "195325000"
+      },
+      {
+        "name": "53.5",
+        "lower-frequency": "195325000",
+        "upper-frequency": "195375000"
+      },
+      {
+        "name": "54.0",
+        "lower-frequency": "195375000",
+        "upper-frequency": "195425000"
+      },
+      {
+        "name": "54.5",
+        "lower-frequency": "195425000",
+        "upper-frequency": "195475000"
+      },
+      {
+        "name": "55.0",
+        "lower-frequency": "195475000",
+        "upper-frequency": "195525000"
+      },
+      {
+        "name": "55.5",
+        "lower-frequency": "195525000",
+        "upper-frequency": "195575000"
+      },
+      {
+        "name": "56.0",
+        "lower-frequency": "195575000",
+        "upper-frequency": "195625000"
+      },
+      {
+        "name": "56.5",
+        "lower-frequency": "195625000",
+        "upper-frequency": "195675000"
+      },
+      {
+        "name": "57.0",
+        "lower-frequency": "195675000",
+        "upper-frequency": "195725000"
+      },
+      {
+        "name": "57.5",
+        "lower-frequency": "195725000",
+        "upper-frequency": "195775000"
+      },
+      {
+        "name": "58.0",
+        "lower-frequency": "195775000",
+        "upper-frequency": "195825000"
+      },
+      {
+        "name": "58.5",
+        "lower-frequency": "195825000",
+        "upper-frequency": "195875000"
+      },
+      {
+        "name": "59.0",
+        "lower-frequency": "195875000",
+        "upper-frequency": "195925000"
+      },
+      {
+        "name": "59.5",
+        "lower-frequency": "195925000",
+        "upper-frequency": "195975000"
+      },
+      {
+        "name": "60.0",
+        "lower-frequency": "195975000",
+        "upper-frequency": "196025000"
+      },
+      {
+        "name": "60.5",
+        "lower-frequency": "196025000",
+        "upper-frequency": "196075000"
+      },
+      {
+        "name": "61.0",
+        "lower-frequency": "196075000",
+        "upper-frequency": "196125000"
+      },
+      {
+        "name": "14 (100GHz)",
+        "lower-frequency": "191350000",
+        "upper-frequency": "191450000"
+      },
+      {
+        "name": "15 (100GHz)",
+        "lower-frequency": "191450000",
+        "upper-frequency": "191550000"
+      },
+      {
+        "name": "16 (100GHz)",
+        "lower-frequency": "191550000",
+        "upper-frequency": "191650000"
+      },
+      {
+        "name": "17 (100GHz)",
+        "lower-frequency": "191650000",
+        "upper-frequency": "191750000"
+      },
+      {
+        "name": "18 (100GHz)",
+        "lower-frequency": "191750000",
+        "upper-frequency": "191850000"
+      },
+      {
+        "name": "19 (100GHz)",
+        "lower-frequency": "191850000",
+        "upper-frequency": "191950000"
+      },
+      {
+        "name": "20 (100GHz)",
+        "lower-frequency": "191950000",
+        "upper-frequency": "192050000"
+      },
+      {
+        "name": "21 (100GHz)",
+        "lower-frequency": "192050000",
+        "upper-frequency": "192150000"
+      },
+      {
+        "name": "22 (100GHz)",
+        "lower-frequency": "192150000",
+        "upper-frequency": "192250000"
+      },
+      {
+        "name": "23 (100GHz)",
+        "lower-frequency": "192250000",
+        "upper-frequency": "192350000"
+      },
+      {
+        "name": "24 (100GHz)",
+        "lower-frequency": "192350000",
+        "upper-frequency": "192450000"
+      },
+      {
+        "name": "25 (100GHz)",
+        "lower-frequency": "192450000",
+        "upper-frequency": "192550000"
+      },
+      {
+        "name": "26 (100GHz)",
+        "lower-frequency": "192550000",
+        "upper-frequency": "192650000"
+      },
+      {
+        "name": "27 (100GHz)",
+        "lower-frequency": "192650000",
+        "upper-frequency": "192750000"
+      },
+      {
+        "name": "28 (100GHz)",
+        "lower-frequency": "192750000",
+        "upper-frequency": "192850000"
+      },
+      {
+        "name": "29 (100GHz)",
+        "lower-frequency": "192850000",
+        "upper-frequency": "192950000"
+      },
+      {
+        "name": "30 (100GHz)",
+        "lower-frequency": "192950000",
+        "upper-frequency": "193050000"
+      },
+      {
+        "name": "31 (100GHz)",
+        "lower-frequency": "193050000",
+        "upper-frequency": "193150000"
+      },
+      {
+        "name": "32 (100GHz)",
+        "lower-frequency": "193150000",
+        "upper-frequency": "193250000"
+      },
+      {
+        "name": "33 (100GHz)",
+        "lower-frequency": "193250000",
+        "upper-frequency": "193350000"
+      },
+      {
+        "name": "34 (100GHz)",
+        "lower-frequency": "193350000",
+        "upper-frequency": "193450000"
+      },
+      {
+        "name": "35 (100GHz)",
+        "lower-frequency": "193450000",
+        "upper-frequency": "193550000"
+      },
+      {
+        "name": "36 (100GHz)",
+        "lower-frequency": "193550000",
+        "upper-frequency": "193650000"
+      },
+      {
+        "name": "37 (100GHz)",
+        "lower-frequency": "193650000",
+        "upper-frequency": "193750000"
+      },
+      {
+        "name": "38 (100GHz)",
+        "lower-frequency": "193750000",
+        "upper-frequency": "193850000"
+      },
+      {
+        "name": "39 (100GHz)",
+        "lower-frequency": "193850000",
+        "upper-frequency": "193950000"
+      },
+      {
+        "name": "40 (100GHz)",
+        "lower-frequency": "193950000",
+        "upper-frequency": "194050000"
+      },
+      {
+        "name": "41 (100GHz)",
+        "lower-frequency": "194050000",
+        "upper-frequency": "194150000"
+      },
+      {
+        "name": "42 (100GHz)",
+        "lower-frequency": "194150000",
+        "upper-frequency": "194250000"
+      },
+      {
+        "name": "43 (100GHz)",
+        "lower-frequency": "194250000",
+        "upper-frequency": "194350000"
+      },
+      {
+        "name": "44 (100GHz)",
+        "lower-frequency": "194350000",
+        "upper-frequency": "194450000"
+      },
+      {
+        "name": "45 (100GHz)",
+        "lower-frequency": "194450000",
+        "upper-frequency": "194550000"
+      },
+      {
+        "name": "46 (100GHz)",
+        "lower-frequency": "194550000",
+        "upper-frequency": "194650000"
+      },
+      {
+        "name": "47 (100GHz)",
+        "lower-frequency": "194650000",
+        "upper-frequency": "194750000"
+      },
+      {
+        "name": "48 (100GHz)",
+        "lower-frequency": "194750000",
+        "upper-frequency": "194850000"
+      },
+      {
+        "name": "49 (100GHz)",
+        "lower-frequency": "194850000",
+        "upper-frequency": "194950000"
+      },
+      {
+        "name": "50 (100GHz)",
+        "lower-frequency": "194950000",
+        "upper-frequency": "195050000"
+      },
+      {
+        "name": "51 (100GHz)",
+        "lower-frequency": "195050000",
+        "upper-frequency": "195150000"
+      },
+      {
+        "name": "52 (100GHz)",
+        "lower-frequency": "195150000",
+        "upper-frequency": "195250000"
+      },
+      {
+        "name": "53 (100GHz)",
+        "lower-frequency": "195250000",
+        "upper-frequency": "195350000"
+      },
+      {
+        "name": "54 (100GHz)",
+        "lower-frequency": "195350000",
+        "upper-frequency": "195450000"
+      },
+      {
+        "name": "55 (100GHz)",
+        "lower-frequency": "195450000",
+        "upper-frequency": "195550000"
+      },
+      {
+        "name": "56 (100GHz)",
+        "lower-frequency": "195550000",
+        "upper-frequency": "195650000"
+      },
+      {
+        "name": "57 (100GHz)",
+        "lower-frequency": "195650000",
+        "upper-frequency": "195750000"
+      },
+      {
+        "name": "58 (100GHz)",
+        "lower-frequency": "195750000",
+        "upper-frequency": "195850000"
+      },
+      {
+        "name": "59 (100GHz)",
+        "lower-frequency": "195850000",
+        "upper-frequency": "195950000"
+      },
+      {
+        "name": "60 (100GHz)",
+        "lower-frequency": "195950000",
+        "upper-frequency": "196050000"
+      }
+    ]
+  },
+  "czechlight-roadm-device:media-channels": [
+    {
+      "channel": "C-band",
+      "description": "Whole-band overview"
+    }
+  ]
+}
diff --git a/tests/czechlight-cfg-fs/data/v0_sdn-roadm-line_with_altered_initial_data/startup.json b/tests/czechlight-cfg-fs/data/v0_sdn-roadm-line_with_altered_initial_data/startup.json
new file mode 100644
index 0000000..4435818
--- /dev/null
+++ b/tests/czechlight-cfg-fs/data/v0_sdn-roadm-line_with_altered_initial_data/startup.json
@@ -0,0 +1,11 @@
+{
+  "czechlight-roadm-device:channel-plan": {
+    "channel": [
+      {
+        "name": "haha",
+        "lower-frequency": "195325000",
+        "upper-frequency": "195425000"
+      }
+    ]
+  }
+}
diff --git a/tests/czechlight-cfg-fs/data/v0_sdn-roadm-line_with_altered_initial_data/version b/tests/czechlight-cfg-fs/data/v0_sdn-roadm-line_with_altered_initial_data/version
new file mode 100644
index 0000000..573541a
--- /dev/null
+++ b/tests/czechlight-cfg-fs/data/v0_sdn-roadm-line_with_altered_initial_data/version
@@ -0,0 +1 @@
+0
diff --git a/tests/czechlight-cfg-fs/migrations.py b/tests/czechlight-cfg-fs/migrations.py
new file mode 100644
index 0000000..87f4b4a
--- /dev/null
+++ b/tests/czechlight-cfg-fs/migrations.py
@@ -0,0 +1,135 @@
+#!/usr/bin/env python3
+
+import json
+import re
+import os
+import pathlib
+import shutil
+import subprocess
+import sys
+
+import pytest
+
+
+SCRIPT_ROOT = pathlib.Path(__file__).resolve().parent
+BR2_ROOT = (SCRIPT_ROOT / '../../').resolve()
+
+INSTALL_SCRIPT_PATH = BR2_ROOT / 'package/czechlight-cfg-fs/czechlight-install-yang.sh'
+MIGRATE_SCRIPT_PATH = BR2_ROOT / 'package/czechlight-cfg-fs/czechlight-migrate.sh'
+MIGRATE_DEFINITIONS_PATH = BR2_ROOT / 'package/czechlight-cfg-fs/czechlight-migration-list.sh'
+NETOPEER_SCRIPT_PATH = BR2_ROOT / 'submodules/buildroot/package/netopeer2/setup.sh'
+
+CLA_SYSREPO_PATH = BR2_ROOT / 'submodules/cla-sysrepo'
+VELIA_PATH = BR2_ROOT / 'submodules/velia'
+NETOPEER2_PATH = BR2_ROOT / 'submodules/dependencies/Netopeer2'
+
+
+def run_and_wait(ctx, desc, command_args):
+    print(f'executing {desc}')
+    with subprocess.Popen(command_args, stdout=sys.stdout, stderr=sys.stderr, env=ctx.get_env()) as proc:
+        proc.wait()
+        assert proc.returncode == 0
+
+
+class SysrepoFixture:
+    def __init__(self, test_directory, tmp_path):
+        test_directory = SCRIPT_ROOT / test_directory
+        self.test_name = test_directory.name
+
+        self.expected_file = test_directory / 'expected.json'
+        assert self.expected_file.is_file()
+
+        startup = test_directory / 'startup.json'
+        assert startup.is_file()
+
+        self.proc_cmdline = test_directory / 'cmdline'
+        assert self.proc_cmdline.is_file()
+
+        version_file = test_directory / 'version'
+        assert version_file.is_file()
+
+        tested_xpath_file = test_directory / 'xpath'
+        self.tested_xpath = tested_xpath_file.read_text() if tested_xpath_file.is_file() else None
+
+        self._running_directory = tmp_path / self.test_name
+        self._running_directory.mkdir()
+
+        self.startup_file = self._running_directory / 'startup.json'
+        shutil.copyfile(startup, self.startup_file)
+
+        self.export_file = self._running_directory / 'export.json'
+
+        self.version_file = self._running_directory / 'version'
+        shutil.copy(version_file, self.version_file)
+
+    def get_env(self):
+        res = os.environ.copy()
+        res['SYSREPO_SHM_PREFIX'] = self.test_name
+        res['SYSREPO_REPOSITORY_PATH'] = self._running_directory / 'sysrepo_repository'
+        res['CLA_YANG'] = CLA_SYSREPO_PATH / 'yang'
+        res['VELIA_YANG'] = VELIA_PATH / 'yang'
+        res['PROC_CMDLINE'] = self.proc_cmdline
+        res['CFG_VERSION_FILE'] = self.version_file
+        res['CFG_STARTUP_FILE'] = self.startup_file
+        res['NP2_MODULE_DIR'] = NETOPEER2_PATH / 'modules'
+        res['NP2_MODULE_PERMS'] = '0600'
+        res['USER'] = os.getlogin()
+        return res
+
+
+@pytest.fixture(scope='session')
+def max_version():
+    """
+    Fetches last version from czechlight-migrate script by sourcing the
+    migration definitions file and verifying the length of the migration
+    files array.
+    """
+    args = ["/bin/bash", "-c", "source " + str(MIGRATE_DEFINITIONS_PATH) + " && echo ${#MIGRATION_FILES[@]}"]
+    with subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE) as proc:
+        proc.wait()
+        stdout, stderr = proc.communicate()
+        assert stderr.decode().strip() == ''
+        assert proc.returncode == 0
+
+    return int(stdout.decode().strip())
+
+
+@pytest.fixture
+def sysrepo_fixture(request, tmp_path):
+    return SysrepoFixture(pathlib.Path(SCRIPT_ROOT / 'data' / request.param), tmp_path)
+
+
+def find_test_directories():
+    return [pytest.param(dirname) for dirname in os.listdir(path=SCRIPT_ROOT / 'data')]
+
+
+@pytest.mark.parametrize("sysrepo_fixture", find_test_directories(), indirect=True)
+def test(sysrepo_fixture, max_version):
+    # prepare sysrepo
+    run_and_wait(sysrepo_fixture, 'netopeer2 setup.sh', [NETOPEER_SCRIPT_PATH])
+    run_and_wait(sysrepo_fixture, 'czechlight-install-yang.sh', [INSTALL_SCRIPT_PATH])
+    run_and_wait(sysrepo_fixture, 'restoring startup.json to sysrepo', ['sysrepocfg', '--datastore', 'startup', '--format', 'json', f'--import={sysrepo_fixture.startup_file}'])
+
+    current_version = int(sysrepo_fixture.version_file.read_text())
+
+    # perform the actual migration
+    print(f'migration: current version is {current_version}')
+    print('migration: applying migration script')
+    run_and_wait(sysrepo_fixture, 'migration', [MIGRATE_SCRIPT_PATH])
+
+    after_migration_version = int(sysrepo_fixture.version_file.read_text())
+    assert after_migration_version == max_version
+
+    print('migration: checking datastore contents')
+    export_args = ['sysrepocfg', '--datastore', 'startup', '-f', 'json', f'--export={sysrepo_fixture.export_file}']
+    if sysrepo_fixture.tested_xpath:
+        export_args += ['-x', sysrepo_fixture.tested_xpath]
+    run_and_wait(sysrepo_fixture, 'export', export_args)
+
+    with open(sysrepo_fixture.export_file, 'r') as fp_actual:
+        with open(sysrepo_fixture.expected_file, 'r') as fp_expected:
+            print(f'migration: comparing files {sysrepo_fixture.startup_file.name} and {sysrepo_fixture.expected_file.name}')
+
+            actual = json.load(fp_actual)
+            expected = json.load(fp_expected)
+            assert actual == expected