diff --git a/tests/czechlight-cfg-fs/data/v1_sdn-roadm-line_empty/cmdline b/tests/czechlight-cfg-fs/data/v1_sdn-roadm-line_empty/cmdline
new file mode 100644
index 0000000..6b1d906
--- /dev/null
+++ b/tests/czechlight-cfg-fs/data/v1_sdn-roadm-line_empty/cmdline
@@ -0,0 +1 @@
+czechlight=sdn-roadm-line
diff --git a/tests/czechlight-cfg-fs/data/v1_sdn-roadm-line_empty/expected.json b/tests/czechlight-cfg-fs/data/v1_sdn-roadm-line_empty/expected.json
new file mode 100644
index 0000000..25dc77e
--- /dev/null
+++ b/tests/czechlight-cfg-fs/data/v1_sdn-roadm-line_empty/expected.json
@@ -0,0 +1,34 @@
+{
+  "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"
+      },
+      {
+        "name": "osc",
+        "type": "iana-if-type:ethernetCsmacd",
+        "czechlight-network:bridge": "br0"
+      }
+    ]
+  }
+}
diff --git a/tests/czechlight-cfg-fs/data/v1_sdn-roadm-line_empty/startup.json b/tests/czechlight-cfg-fs/data/v1_sdn-roadm-line_empty/startup.json
new file mode 100644
index 0000000..2c63c08
--- /dev/null
+++ b/tests/czechlight-cfg-fs/data/v1_sdn-roadm-line_empty/startup.json
@@ -0,0 +1,2 @@
+{
+}
diff --git a/tests/czechlight-cfg-fs/data/v1_sdn-roadm-line_empty/version b/tests/czechlight-cfg-fs/data/v1_sdn-roadm-line_empty/version
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ b/tests/czechlight-cfg-fs/data/v1_sdn-roadm-line_empty/version
@@ -0,0 +1 @@
+1
diff --git a/tests/czechlight-cfg-fs/data/v1_sdn-roadm-line_empty/xpath b/tests/czechlight-cfg-fs/data/v1_sdn-roadm-line_empty/xpath
new file mode 100644
index 0000000..a745562
--- /dev/null
+++ b/tests/czechlight-cfg-fs/data/v1_sdn-roadm-line_empty/xpath
@@ -0,0 +1 @@
+/ietf-interfaces:interfaces