1 files changed, 48 insertions, 0 deletions
diff --git a/tests/libntp/caltontp.c b/tests/libntp/caltontp.c
new file mode 100644
index 000000000000..9ce485440502
--- /dev/null
+++ b/tests/libntp/caltontp.c
@@ -0,0 +1,48 @@
+#include "config.h"
+#include "unity.h"
+#include "ntp_calendar.h"
+
+void
+test_DateGivenMonthDay(void) {
+	// 2010-06-24 12:50:00
+	struct calendar input = {2010, 0, 6, 24, 12, 50, 0};
+
+	u_long expected = 3486372600UL; // This is the timestamp above.
+
+	TEST_ASSERT_EQUAL_UINT(expected, caltontp(&input));
+}
+
+void
+test_DateGivenYearDay(void) {
+	// 2010-06-24 12:50:00
+	// This is the 175th day of 2010.
+	struct calendar input = {2010, 175, 0, 0, 12, 50, 0};
+
+	u_long expected = 3486372600UL; // This is the timestamp above.
+
+	TEST_ASSERT_EQUAL_UINT(expected, caltontp(&input));
+}
+
+void
+test_DateLeapYear(void) {
+	// 2012-06-24 12:00:00
+	// This is the 176th day of 2012 (since 2012 is a leap year).
+	struct calendar inputYd = {2012, 176, 0, 0, 12, 00, 00};
+	struct calendar inputMd = {2012, 0, 6, 24, 12, 00, 00};
+
+	u_long expected = 3549528000UL;
+
+	TEST_ASSERT_EQUAL_UINT(expected, caltontp(&inputYd));
+	TEST_ASSERT_EQUAL_UINT(expected, caltontp(&inputMd));
+}
+
+void
+test_WraparoundDateIn2036(void) {
+	// 2036-02-07 06:28:16
+	// This is (one) wrapping boundary where we go from ULONG_MAX to 0.
+	struct calendar input = {2036, 0, 2, 7, 6, 28, 16};
+
+	u_long expected = 0UL;
+
+	TEST_ASSERT_EQUAL_UINT(expected, caltontp(&input));
+}