diff --git a/metrics_utils_unittest.cc b/metrics_utils_unittest.cc
index edf6bc3..417a72b 100644
--- a/metrics_utils_unittest.cc
+++ b/metrics_utils_unittest.cc
@@ -32,6 +32,9 @@
   EXPECT_EQ(metrics::ConnectionType::kUnknown,
             GetConnectionType(ConnectionType::kUnknown,
                               ConnectionTethering::kUnknown));
+  EXPECT_EQ(metrics::ConnectionType::kDisconnected,
+            GetConnectionType(ConnectionType::kDisconnected,
+                              ConnectionTethering::kUnknown));
   EXPECT_EQ(metrics::ConnectionType::kEthernet,
             GetConnectionType(ConnectionType::kEthernet,
                               ConnectionTethering::kUnknown));