1 files changed, 33 insertions, 0 deletions
diff --git a/lib/libutil++/tests/up_test.cc b/lib/libutil++/tests/up_test.cc
new file mode 100644
index 000000000000..3f344054c334
--- /dev/null
+++ b/lib/libutil++/tests/up_test.cc
@@ -0,0 +1,33 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2025 Chelsio Communications, Inc.
+ * Written by: John Baldwin <jhb@FreeBSD.org>
+ */
+
+#include <atf-c++.hpp>
+#include <libutil.h>
+
+#include <libutil++.hh>
+
+ATF_TEST_CASE_WITHOUT_HEAD(FILE_up);
+ATF_TEST_CASE_BODY(FILE_up)
+{
+	FILE *fp = fopen("/dev/null", "r");
+	ATF_REQUIRE(fp != NULL);
+	ATF_REQUIRE(fileno(fp) != -1);
+
+	freebsd::FILE_up f(fp);
+	ATF_REQUIRE_EQ(fileno(fp), fileno(f.get()));
+
+	f.reset();
+	ATF_REQUIRE_EQ(f.get(), nullptr);
+
+	ATF_REQUIRE_EQ(-1, fileno(fp));
+	ATF_REQUIRE_EQ(EBADF, errno);
+}
+
+ATF_INIT_TEST_CASES(tcs)
+{
+	ATF_ADD_TEST_CASE(tcs, FILE_up);
+}