Expand network util to check for link local addresses (#33499)

tests/util/test_network.py

@@ -0,0 +1,40 @@
+"""Test Home Assistant volume utility functions."""
+
+from ipaddress import ip_address
+
+import homeassistant.util.network as network_util
+
+
+def test_is_loopback():
+    """Test loopback addresses."""
+    assert network_util.is_loopback(ip_address("127.0.0.2"))
+    assert network_util.is_loopback(ip_address("127.0.0.1"))
+    assert network_util.is_loopback(ip_address("::1"))
+    assert network_util.is_loopback(ip_address("::ffff:127.0.0.0"))
+    assert network_util.is_loopback(ip_address("0:0:0:0:0:0:0:1"))
+    assert network_util.is_loopback(ip_address("0:0:0:0:0:ffff:7f00:1"))
+    assert not network_util.is_loopback(ip_address("104.26.5.238"))
+    assert not network_util.is_loopback(ip_address("2600:1404:400:1a4::356e"))
+
+
+def test_is_private():
+    """Test private addresses."""
+    assert network_util.is_private(ip_address("192.168.0.1"))
+    assert network_util.is_private(ip_address("172.16.12.0"))
+    assert network_util.is_private(ip_address("10.5.43.3"))
+    assert network_util.is_private(ip_address("fd12:3456:789a:1::1"))
+    assert not network_util.is_private(ip_address("127.0.0.1"))
+    assert not network_util.is_private(ip_address("::1"))
+
+
+def test_is_link_local():
+    """Test link local addresses."""
+    assert network_util.is_link_local(ip_address("169.254.12.3"))
+    assert not network_util.is_link_local(ip_address("127.0.0.1"))
+
+
+def test_is_local():
+    """Test local addresses."""
+    assert network_util.is_local(ip_address("192.168.0.1"))
+    assert network_util.is_local(ip_address("127.0.0.1"))
+    assert not network_util.is_local(ip_address("208.5.4.2"))