Test main for failure seen in uutils#7378 for Y2038 bug

It's unclear to me how the failure seen in uutils#7378
is related to the change in the PR, it just happen
that the test need to try touching in 2068.
The 2^32 error in the test makes me strongly think
of  the year 2038 bug, so I added a test for that.

Author: M Bussonnier

tests/by-util/test_touch.rs

@@ -5,6 +5,7 @@
 // spell-checker:ignore (formats) cymdhm cymdhms mdhm mdhms ymdhm ymdhms datetime mktime
 
 use crate::common::util::{AtPath, TestScenario};
+use chrono::NaiveDate;
 #[cfg(not(target_os = "freebsd"))]
 use filetime::set_symlink_file_times;
 use filetime::FileTime;
@@ -181,6 +182,47 @@ fn test_touch_2_digit_years_69() {
     assert_eq!(mtime, expected);
 }
 
+#[test]
+fn test_y2038_touch() {
+    // Jan 19 2038, 03:14:07 UTC is the moment of the Y2038 bug
+    // test 1 second before, at, and 1 second after
+    let year = 2038;
+    let month = 1;
+    let day = 19;
+    let hours = 3;
+    let minutes = 14;
+    let seconds = 7;
+    for deltas in [-1i32, 0, 1] {
+        let (at, mut ucmd) = at_and_ucmd!();
+
+        let date = NaiveDate::from_ymd_opt(year, month, day).unwrap();
+        let datetime = date
+            .and_hms_opt(hours, minutes, (seconds + deltas).try_into().unwrap())
+            .unwrap();
+        let timestamp = datetime.and_utc().timestamp();
+
+        let date = format!(
+            "{}{:02}{:02}{:02}{:02}.{:02}",
+            year,
+            month,
+            day,
+            hours,
+            minutes,
+            seconds + deltas
+        );
+        let file = format!("Y2038_{}_{}", date, deltas);
+        ucmd.args(&["-t", &date, &file]).succeeds().no_output();
+
+        assert!(at.file_exists(&file));
+
+        let expected = FileTime::from_unix_time(timestamp, 0);
+        let (atime, mtime) = get_file_times(&at, &file);
+        assert_eq!(atime, mtime);
+        assert_eq!(atime, expected);
+        assert_eq!(mtime, expected);
+    }
+}
+
 #[test]
 fn test_touch_set_ymdhm_time() {
     let (at, mut ucmd) = at_and_ucmd!();