TST: add test for to_datetime bug #30050

Author: AlexKirko

pandas/tests/tools/test_datetime.py

@@ -0,0 +1,21 @@
+import pandas as pd
+import numpy as np
+
+import pytest
+import pandas.util.testing as tm
+
+def test_to_datetime():
+    # Test for #30050
+    ser = pd.Series([1,2,None, 2**61, None])
+    ser = ser.astype("Int64")
+
+    res = pd.to_datetime(ser, unit='ns')
+    
+    expected = pd.Series([
+        np.datetime64('1970-01-01 00:00:00.000000001'),
+        np.datetime64('1970-01-01 00:00:00.000000002'),
+        np.datetime64('NaT'),
+        np.datetime64('2043-01-25 23:56:49.213693952'),
+        np.datetime64('NaT'),
+    ])
+    tm.assert_series_equal(res, expected)