Refactor wireguard to use a different config dir instead of /etc/wireguard

src/utils/derive-wireguard-interface-name.test.ts

@@ -0,0 +1,21 @@
+import { describe, expect, test } from "bun:test";
+import deriveWireguardInterfaceName from "./derive-wireguard-interface-name";
+
+describe("deriveWireguardInterfaceName", () => {
+    test("derives interface name from host id", () => {
+        expect(deriveWireguardInterfaceName({ host_id: 0 })).toBe("wgui0");
+        expect(deriveWireguardInterfaceName({ host_id: 1 })).toBe("wgui1");
+        expect(deriveWireguardInterfaceName({ host_id: 7 })).toBe("wgui7");
+    });
+
+    test("uses a project-scoped prefix, never stock wgN", () => {
+        expect(deriveWireguardInterfaceName({ host_id: 0 })).not.toBe("wg0");
+        expect(deriveWireguardInterfaceName({ host_id: 1 })).not.toBe("wg1");
+    });
+
+    test("prefix matches wg-quick interface name requirements (<= 15 chars)", () => {
+        expect(deriveWireguardInterfaceName({ host_id: 0 }).length).toBeLessThanOrEqual(
+            15,
+        );
+    });
+});