skip test if cannot get hostname

src/findssh/__init__.py

@@ -13,7 +13,10 @@ def get_lan_ip() -> ipaddress.IPv4Address | ipaddress.IPv6Address:
     ref: http://stackoverflow.com/a/23822431
     """
 
-    return ipaddress.ip_address(socket.gethostbyname(socket.gethostname()))
+    if not (name := socket.gethostname()):
+        raise OSError("cannot get hostname")
+
+    return ipaddress.ip_address(socket.gethostbyname(name))
 
 
 def address2net(

src/findssh/tests/test_coro.py

@@ -1,5 +1,6 @@
 import ipaddress
 import asyncio
+import pytest
 
 import findssh
 import findssh.coro
@@ -9,7 +10,13 @@
 
 
 def test_coroutine():
-    net = findssh.address2net(findssh.get_lan_ip())
+    try:
+        ip = findssh.get_lan_ip()
+    except OSError as excp:
+        if excp == "cannot get hostname":
+            pytest.skip("cannot get hostname")
+
+    net = findssh.address2net(ip)
     hosts = asyncio.run(findssh.coro.get_hosts(net, PORT, TIMEOUT))
     for host, svc in hosts:
         assert isinstance(host, ipaddress.IPv4Address)

src/findssh/tests/test_threadpool.py

@@ -1,7 +1,9 @@
 """
 normally we use coroutines, but for demo purposes we have threadpool too.
 """
+
 import ipaddress
+import pytest
 
 import findssh.threadpool
 
@@ -10,7 +12,13 @@
 
 
 def test_threadpool():
-    net = findssh.address2net(findssh.get_lan_ip())
+    try:
+        ip = findssh.get_lan_ip()
+    except OSError as excp:
+        if excp == "cannot get hostname":
+            pytest.skip("cannot get hostname")
+
+    net = findssh.address2net(ip)
     hosts = findssh.threadpool.get_hosts(net, PORT, TIMEOUT)
     for host, svc in hosts:
         assert isinstance(host, ipaddress.IPv4Address)