Add tests for date parsing when display.date_dayfirst and display.date_yearfirst are set

Author: hknvdn

pandas/tests/tslibs/test_parsing.py

@@ -10,6 +10,8 @@
 import numpy as np
 import pytest
 
+from pandas._config import set_option
+
 from pandas._libs.tslibs import (
     parsing,
     strptime,
@@ -421,3 +423,39 @@ def test_hypothesis_delimited_date(
 
     assert except_out_dateutil == except_in_dateutil
     assert result == expected
+
+
+@pytest.mark.parametrize("input", ["21-01-01", "01-01-21"])
+@pytest.mark.parametrize("dayfirst", [True, False])
+def test_parse_datetime_string_with_reso_dayfirst(dayfirst, input):
+    set_option("display.date_dayfirst", dayfirst)
+    except_out_dateutil, result = _helper_hypothesis_delimited_date(
+        parsing.parse_datetime_string_with_reso, input
+    )
+    except_in_dateutil, expected = _helper_hypothesis_delimited_date(
+        du_parse,
+        input,
+        default=datetime(1, 1, 1),
+        dayfirst=dayfirst,
+        yearfirst=False,
+    )
+    assert except_out_dateutil == except_in_dateutil
+    assert result[0] == expected
+
+
+@pytest.mark.parametrize("input", ["21-01-01", "01-01-21"])
+@pytest.mark.parametrize("yearfirst", [True, False])
+def test_parse_datetime_string_with_reso_yearfirst(yearfirst, input):
+    set_option("display.date_yearfirst", yearfirst)
+    except_out_dateutil, result = _helper_hypothesis_delimited_date(
+        parsing.parse_datetime_string_with_reso, input
+    )
+    except_in_dateutil, expected = _helper_hypothesis_delimited_date(
+        du_parse,
+        input,
+        default=datetime(1, 1, 1),
+        dayfirst=False,
+        yearfirst=yearfirst,
+    )
+    assert except_out_dateutil == except_in_dateutil
+    assert result[0] == expected