adjust test data

client/tests/helpers/network.ts

@@ -0,0 +1,38 @@
+import { networkInterfaces } from 'os';
+
+interface DHCPConfig {
+    interfaceName: string;
+    rangeStart: string;
+    rangeEnd: string;
+    subnetMask: string;
+}
+
+export function getDHCPConfig(): DHCPConfig {
+    const interfaces = networkInterfaces();
+    for (const [name, addresses] of Object.entries(interfaces)) {
+        const ipv4Address = addresses?.find((addr) => addr.family === 'IPv4' && !addr.internal);
+        if (ipv4Address) {
+            const ip = ipv4Address.address.split('.').map(Number);
+            const mask = ipv4Address.netmask?.split('.').map(Number) || [255, 255, 255, 0];
+            
+            // Calculate network address
+            const network = ip.map((octet, i) => octet & mask[i]);
+            
+            // Calculate first and last usable addresses (excluding network and broadcast)
+            const rangeStart = [...network];
+            rangeStart[3] = network[3] + 1;
+            
+            const broadcast = network.map((octet, i) => octet | (~mask[i] & 255));
+            const rangeEnd = [...broadcast];
+            rangeEnd[3] = broadcast[3] - 1;
+
+            return {
+                interfaceName: name,
+                rangeStart: rangeStart.join('.'),
+                rangeEnd: rangeEnd.join('.'),
+                subnetMask: ipv4Address.netmask || '255.255.255.0',
+            };
+        }
+    }
+    throw new Error('No suitable network interface found');
+}