diff --git a/tests/string_test.cpp b/tests/string_test.cpp
index 38957e2..e7e0f34 100644
--- a/tests/string_test.cpp
+++ b/tests/string_test.cpp
@@ -1685,3 +1685,16 @@
   GTEST_SKIP() << "memset_explicit not available";
 #endif
 }
+
+TEST(STRING_TEST, strerrorname_np) {
+#if defined(__BIONIC__)
+  ASSERT_STREQ("0", strerrorname_np(0));
+  ASSERT_STREQ("EINVAL", strerrorname_np(EINVAL));
+  ASSERT_STREQ("ENOSYS", strerrorname_np(ENOSYS));
+
+  ASSERT_EQ(nullptr, strerrorname_np(-1));
+  ASSERT_EQ(nullptr, strerrorname_np(666));
+#else
+  GTEST_SKIP() << "strerrorname_np not available";
+#endif
+}