Add tests by @gwbres

tests/epoch.rs

@@ -1882,25 +1882,28 @@ fn regression_test_gh_272() {
 
     assert_eq!(years, 2021);
 
-    // Check that even in GPST, we start counting the days at one.
-    let epoch = Epoch::from_str("2021-12-31T00:00:00 GPST").unwrap();
-    let (years, day_of_year) = epoch.year_days_of_year();
-    assert_eq!(years, 2021);
-    assert_eq!(day_of_year, 365.0);
-
-    let epoch = Epoch::from_str("2020-12-31T00:00:00 GPST").unwrap();
-    let (years, day_of_year) = epoch.year_days_of_year();
-    assert_eq!(years, 2020);
-    // 366 days in 2020, leap year.
-    assert_eq!(day_of_year, 366.0);
-
-    let epoch = Epoch::from_str("2021-01-01T00:00:00 UTC").unwrap();
-    let (years, day_of_year) = epoch.year_days_of_year();
-    assert_eq!(years, 2021);
-    assert_eq!(day_of_year, 1.0);
-
-    let epoch = Epoch::from_str("2021-01-01T00:00:00 GPST").unwrap();
-    let (years, day_of_year) = epoch.year_days_of_year();
-    assert_eq!(years, 2021);
-    assert_eq!(day_of_year, 1.0);
+    // Check that even in GPST, we start counting the days at one, in all timescales.
+    for ts in [
+        TimeScale::TAI,
+        TimeScale::GPST,
+        TimeScale::UTC,
+        TimeScale::GST,
+        TimeScale::BDT,
+    ] {
+        let epoch = Epoch::from_gregorian_at_midnight(2021, 12, 31, ts);
+        let (years, day_of_year) = epoch.year_days_of_year();
+        assert_eq!(years, 2021);
+        assert_eq!(day_of_year, 365.0);
+
+        let epoch = Epoch::from_gregorian_at_midnight(2020, 12, 31, ts);
+        let (years, day_of_year) = epoch.year_days_of_year();
+        assert_eq!(years, 2020);
+        // 366 days in 2020, leap year.
+        assert_eq!(day_of_year, 366.0);
+
+        let epoch = Epoch::from_gregorian_at_midnight(2021, 1, 1, ts);
+        let (years, day_of_year) = epoch.year_days_of_year();
+        assert_eq!(years, 2021);
+        assert_eq!(day_of_year, 1.0);
+    }
 }