tests: Patch missed coverage spots.

src/display.rs

@@ -22,5 +22,6 @@ mod tests {
   fn test_display() {
     let t = Timestamp::from(1335020400);
     assert_eq!(format!("{:.02}", t), "1335020400.00");
+    assert_eq!(format!("{}", t), "1335020400");
   }
 }

src/integers.rs

@@ -107,4 +107,10 @@ mod tests {
     assert_eq!(ts.seconds, 1335020400 - 86400);
     assert_eq!(ts.nanos, 500_000_000);
   }
+
+  #[test]
+  fn test_rem() {
+    let ts = Timestamp::new(86500, 12);
+    assert_eq!(ts % 86400, Timestamp::new(100, 12))
+  }
 }

src/lib.rs

@@ -71,6 +71,7 @@ impl Timestamp {
   /// ## Panic
   ///
   /// Panics if the system clock is set to a time prior to the Unix epoch (January 1, 1970).
+  #[cfg(not(tarpaulin_include))]
   pub fn now() -> Self {
     let now_dur = SystemTime::now()
       .duration_since(SystemTime::UNIX_EPOCH)
@@ -146,6 +147,13 @@ mod tests {
 
   use super::*;
 
+  #[test]
+  fn test_new_overflow() {
+    let ts = Timestamp::new(1, 1_500_000_000);
+    check!(ts.seconds() == 2);
+    check!(ts.subsec(3) == 500);
+  }
+
   #[test]
   fn test_cmp() {
     check!(Timestamp::from(1335020400) < Timestamp::from(1335024000));