diff --git a/tests/simple/testdata/network_ext.textproto b/tests/simple/testdata/network_ext.textproto
index f582118..8b5bbcc 100644
--- a/tests/simple/testdata/network_ext.textproto
+++ b/tests/simple/testdata/network_ext.textproto
@@ -181,13 +181,17 @@ section {
     value: { bool_value: false }
   }
   test {
-    name: "ipv4_equals_ipv6"
+    name: "invalid_ipv4_equals_ipv6"
     expr: "ip('::ffff:c0a8:1') == ip('192.168.0.1')"
-    value: { bool_value: true }
+    eval_error: {
+      errors: {
+        message: "IPv4-mapped IPv6 address is not allowed"
+      }
+    }
   }
   test {
     name: "ipv4_not_equals_ipv6"
-    expr: "ip('::ffff:c0a8:1') == ip('192.168.10.1')"
+    expr: "ip('192.168.0.1') == ip('2001:db8::1')"
     value: { bool_value: false }
   }
 }