diff --git a/test/test_util.cpp b/test/test_util.cpp
index e3a1fba..7742ca7 100644
--- a/test/test_util.cpp
+++ b/test/test_util.cpp
@@ -57,10 +57,12 @@
 {
     struct in_addr ip1;
     EXPECT_EQ(1, inet_pton(AF_INET, "192.168.10.1", &ip1));
+    EXPECT_EQ("192.168.10.1", toString(ip1));
     EXPECT_EQ("192.168.10.1", toString(InAddrAny(ip1)));
 
     struct in6_addr ip2;
     EXPECT_EQ(1, inet_pton(AF_INET6, "fdd8:b5ad:9d93:94ee::2:1", &ip2));
+    EXPECT_EQ("fdd8:b5ad:9d93:94ee::2:1", toString(ip2));
     EXPECT_EQ("fdd8:b5ad:9d93:94ee::2:1", toString(InAddrAny(ip2)));
 }