Add tests

tests/helpers/test_service_info.py

@@ -0,0 +1,14 @@
+"""Test service_info helpers."""
+
+from homeassistant.helpers.service_info.dhcp import DhcpServiceInfo
+
+# Ensure that DhcpServiceInfo.__post_init__ is called, even on a constant outside of a test
+try:
+    _ = DhcpServiceInfo(ip="", hostname="", macaddress="AA:BB:CC:DD:EE:FF")
+except ValueError:
+    pass
+else:
+    raise RuntimeError(
+        "DhcpServiceInfo.__post_init__ was not called. "
+        "Please ensure that the __post_init__ method is correctly defined."
+    )