FTS_PHYSICAL | FTS_NOSTAT_TYPE,
 		    (struct fts_expect[]){
@@ -414,7 +353,7 @@ ATF_TC_HEAD(fts_options_physical_seedot, tc)
 ATF_TC_BODY(fts_options_physical_seedot, tc)
 {
 	fts_options_prepare(tc);
-	fts_options_test(tc, &(struct fts_testcase){
+	fts_test(tc, &(struct fts_testcase){
 		    all_paths,
 		    FTS_PHYSICAL | FTS_SEEDOT,
 		    (struct fts_expect[]){
@@ -440,6 +379,7 @@ ATF_TC_BODY(fts_options_physical_seedot, tc)
 
 ATF_TP_ADD_TCS(tp)
 {
+	fts_check_debug();
 	ATF_TP_ADD_TC(tp, fts_options_logical);
 	ATF_TP_ADD_TC(tp, fts_options_logical_nostat);
 	ATF_TP_ADD_TC(tp, fts_options_logical_seedot);
diff --git a/lib/libc/tests/gen/fts_test.h b/lib/libc/tests/gen/fts_test.h
new file mode 100644
index 000000000000..b3f15050f265
--- /dev/null
+++ b/lib/libc/tests/gen/fts_test.h
@@ -0,0 +1,81 @@
+/*-
+ * Copyright (c) 2025 Klara, Inc.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#ifndef FTS_TEST_H_INCLUDED
+#define FTS_TEST_H_INCLUDED
+
+struct fts_expect {
+	int fts_info;
+	const char *fts_name;
+	const char *fts_accpath;
+};
+
+struct fts_testcase {
+	char **paths;
+	int fts_options;
+	struct fts_expect *fts_expect;
+};
+
+/* shorter name for dead links */
+#define FTS_DL FTS_SLNONE
+
+/* are we being debugged? */
+static bool fts_test_debug;
+
+/*
+ * Set debug flag if appropriate.
+ */
+static void
+fts_check_debug(void)
+{
+	fts_test_debug = !getenv("__RUNNING_INSIDE_ATF_RUN") &&
+	    isatty(STDERR_FILENO);
+}
+
+/*
+ * Lexical order for reproducability.
+ */
+static int
+fts_lexical_compar(const FTSENT * const *a, const FTSENT * const *b)
+{
+	return (strcmp((*a)->fts_name, (*b)->fts_name));
+}
+
+/*
+ * Run FTS with the specified paths and options and verify that it
+ * produces the expected result in the correct order.
+ */
+static void
+fts_test(const struct atf_tc *tc, const struct fts_testcase *fts_tc)
+{
+	FTS *fts;
+	FTSENT *ftse;
+	const struct fts_expect *expect = fts_tc->fts_expect;
+	long level = 0;
+
+	fts = fts_open(fts_tc->paths, fts_tc->fts_options, fts_lexical_compar);
+	ATF_REQUIRE_MSG(fts != NULL, "fts_open(): %m");
+	while ((ftse = fts_read(fts)) != NULL && expect->fts_name != NULL) {
+		if (expect->fts_info == FTS_DP || expect->fts_info == FTS_DNR)
+			level--;
+		if (fts_test_debug) {
+			fprintf(stderr, "%2ld %2d %s\n", level,
+			    ftse->fts_info, ftse->fts_name);
+		}
+		ATF_CHECK_STREQ(expect->fts_name, ftse->fts_name);
+		ATF_CHECK_STREQ(expect->fts_accpath, ftse->fts_accpath);
+		ATF_CHECK_INTEQ(expect->fts_info, ftse->fts_info);
+		ATF_CHECK_INTEQ(level, ftse->fts_level);
+		if (expect->fts_info == FTS_D)
+			level++;
+		expect++;
+	}
+	ATF_CHECK_EQ(NULL, ftse);
+	ATF_CHECK_EQ(NULL, expect->fts_name);
+	ATF_REQUIRE_EQ_MSG(0, fts_close(fts), "fts_close(): %m");
+}
+
+#endif /* FTS_TEST_H_INCLUDED */