1 files changed, 51 insertions, 0 deletions

diff --git a/rust/gigasecond/tests/gigasecond.rs b/rust/gigasecond/tests/gigasecond.rs
new file mode 100644
index 0000000..4fe139b
--- /dev/null
+++ b/rust/gigasecond/tests/gigasecond.rs
@@ -0,0 +1,51 @@
+use chrono::{TimeZone, Utc};
+
+#[test]
+fn test_date() {
+    let start_date = Utc.ymd(2011, 4, 25).and_hms(0, 0, 0);
+
+    assert_eq!(
+        gigasecond::after(start_date),
+        Utc.ymd(2043, 1, 1).and_hms(1, 46, 40)
+    );
+}
+
+#[test]
+fn test_another_date() {
+    let start_date = Utc.ymd(1977, 6, 13).and_hms(0, 0, 0);
+
+    assert_eq!(
+        gigasecond::after(start_date),
+        Utc.ymd(2009, 2, 19).and_hms(1, 46, 40)
+    );
+}
+
+#[test]
+fn test_third_date() {
+    let start_date = Utc.ymd(1959, 7, 19).and_hms(0, 0, 0);
+
+    assert_eq!(
+        gigasecond::after(start_date),
+        Utc.ymd(1991, 3, 27).and_hms(1, 46, 40)
+    );
+}
+
+#[test]
+fn test_datetime() {
+    let start_date = Utc.ymd(2015, 1, 24).and_hms(22, 0, 0);
+
+    assert_eq!(
+        gigasecond::after(start_date),
+        Utc.ymd(2046, 10, 2).and_hms(23, 46, 40)
+    );
+}
+
+#[test]
+fn test_another_datetime() {
+    let start_date = Utc.ymd(2015, 1, 24).and_hms(23, 59, 59);
+
+    assert_eq!(
+        gigasecond::after(start_date),
+        Utc.ymd(2046, 10, 3).and_hms(1, 46, 39)
+    );
+}