1 files changed, 50 insertions, 0 deletions
diff --git a/lib/libc/tests/stdtime/strptime_test.c b/lib/libc/tests/stdtime/strptime_test.c
new file mode 100644
index 000000000000..79a97764999c
--- /dev/null
+++ b/lib/libc/tests/stdtime/strptime_test.c
@@ -0,0 +1,50 @@
+/*-
+ * Copyright (c) 2024 Dag-Erling Smørgrav
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <time.h>
+
+#include <atf-c.h>
+
+ATF_TC_WITHOUT_HEAD(dayofweek);
+ATF_TC_BODY(dayofweek, tc)
+{
+	static const struct {
+		const char *str;
+		int wday;
+	} cases[] = {
+		{ "1582-12-20", 1 },
+		{ "1700-03-01", 1 },
+		{ "1752-09-14", 4 },
+		{ "1800-12-31", 3 },
+		{ "1801-01-01", 4 },
+		{ "1900-12-31", 1 },
+		{ "1901-01-01", 2 },
+		{ "2000-12-31", 0 },
+		{ "2001-01-01", 1 },
+		{ "2100-12-31", 5 },
+		{ "2101-01-01", 6 },
+		{ "2200-12-31", 3 },
+		{ "2201-01-01", 4 },
+		{ },
+	};
+	struct tm tm;
+
+	for (unsigned int i = 0; cases[i].str != NULL; i++) {
+		if (strptime(cases[i].str, "%Y-%m-%d", &tm) == NULL) {
+			atf_tc_fail_nonfatal("failed to parse %s",
+			    cases[i].str);
+		} else if (tm.tm_wday != cases[i].wday) {
+			atf_tc_fail_nonfatal("expected %d for %s, got %d",
+			    cases[i].wday, cases[i].str, tm.tm_wday);
+		}
+	}
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+	ATF_TP_ADD_TC(tp, dayofweek);
+	return (atf_no_error());
+}