TST: Added test for date_range for bug GH#57456 (#59519)

TST: Added test for date_range for bug #57456

Co-authored-by: Matthew Roeschke <10647082+mroeschke@users.noreply.github.com>

pandas/tests/indexes/datetimes/test_date_range.py

@@ -1258,6 +1258,24 @@ def test_range_with_timezone_and_custombusinessday(self, start, period, expected
         expected = DatetimeIndex(expected).as_unit("ns")
         tm.assert_index_equal(result, expected)
 
+    def test_data_range_custombusinessday_partial_time(self, unit):
+        # GH#57456
+        offset = offsets.CustomBusinessDay(weekmask="Sun Mon Tue")
+        start = datetime(2024, 2, 6, 23)
+        # end datetime is partial and not in the offset
+        end = datetime(2024, 2, 14, 14)
+        result = date_range(start, end, freq=offset, unit=unit)
+        expected = DatetimeIndex(
+            [
+                "2024-02-06 23:00:00",
+                "2024-02-11 23:00:00",
+                "2024-02-12 23:00:00",
+                "2024-02-13 23:00:00",
+            ],
+            dtype=f"M8[{unit}]",
+        )
+        tm.assert_index_equal(result, expected)
+
 
 class TestDateRangeNonNano:
     def test_date_range_reso_validation(self):