Add tests defining the desired behavior for precisedelta.

Author: nuztalgia

tests/test_time.py

@@ -608,8 +608,29 @@ def test_precisedelta_multiple_units(
             "5 days and 4.50 hours",
         ),
         (dt.timedelta(days=5, hours=4, seconds=30 * 60), "days", "%0.2f", "5.19 days"),
+        (dt.timedelta(days=31), "days", "%d", "1 month"),
+        (dt.timedelta(days=31.01), "days", "%d", "1 month and 1 day"),
+        (dt.timedelta(days=92), "days", "%d", "3 months"),
         (dt.timedelta(days=120), "months", "%0.2f", "3.93 months"),
         (dt.timedelta(days=183), "years", "%0.1f", "0.5 years"),
+        (0.01, "seconds", "%0.3f", "0.010 seconds"),
+        (31, "minutes", "%d", "1 minute"),
+        (60 + 29.99, "minutes", "%d", "1 minute"),
+        (60 + 30, "minutes", "%d", "2 minutes"),
+        (60 * 60 + 30.99, "minutes", "%.0f", "1 hour"),
+        (60 * 60 + 31, "minutes", "%.0f", "1 hour and 1 minute"),
+        (
+            ONE_DAY - MILLISECONDS_1_337,
+            "seconds",
+            "%.1f",
+            "23 hours, 59 minutes and 58.7 seconds",
+        ),
+        (
+            ONE_DAY - ONE_MILLISECOND,
+            "seconds",
+            "%.4f",
+            "23 hours, 59 minutes and 59.9990 seconds",
+        ),
     ],
 )
 def test_precisedelta_custom_format(