1 files changed, 52 insertions, 0 deletions
diff --git a/lib/libutil++/tests/stringf_test.cc b/lib/libutil++/tests/stringf_test.cc
new file mode 100644
index 000000000000..5b8ef4ad54a9
--- /dev/null
+++ b/lib/libutil++/tests/stringf_test.cc
@@ -0,0 +1,52 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2025 Chelsio Communications, Inc.
+ * Written by: John Baldwin <jhb@FreeBSD.org>
+ */
+
+#include <atf-c++.hpp>
+#include <stdarg.h>
+#include <stdio.h>
+
+#include <libutil++.hh>
+
+ATF_TEST_CASE_WITHOUT_HEAD(basic);
+ATF_TEST_CASE_BODY(basic)
+{
+	ATF_REQUIRE_EQ("foo", freebsd::stringf("foo"));
+	ATF_REQUIRE_EQ("bar", freebsd::stringf("%s", "bar"));
+	ATF_REQUIRE_EQ("42", freebsd::stringf("%u", 42));
+	ATF_REQUIRE_EQ("0xdeadbeef", freebsd::stringf("%#x", 0xdeadbeef));
+	ATF_REQUIRE_EQ("", freebsd::stringf(""));
+	ATF_REQUIRE_EQ("this is a test", freebsd::stringf("this %s test",
+	    "is a"));
+}
+
+static std::string
+stringv(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	std::string str = freebsd::stringf(fmt, ap);
+	va_end(ap);
+	return (str);
+}
+
+ATF_TEST_CASE_WITHOUT_HEAD(va_list);
+ATF_TEST_CASE_BODY(va_list)
+{
+	ATF_REQUIRE_EQ("foo", stringv("foo"));
+	ATF_REQUIRE_EQ("bar", stringv("%s", "bar"));
+	ATF_REQUIRE_EQ("42", stringv("%u", 42));
+	ATF_REQUIRE_EQ("0xdeadbeef", stringv("%#x", 0xdeadbeef));
+	ATF_REQUIRE_EQ("", stringv(""));
+	ATF_REQUIRE_EQ("this is a test", stringv("this %s test", "is a"));
+}
+
+ATF_INIT_TEST_CASES(tcs)
+{
+	ATF_ADD_TEST_CASE(tcs, basic);
+	ATF_ADD_TEST_CASE(tcs, va_list);
+}