added new '%Y %m %d' format and 2 @pytest.mark.parametrize for test_hypothesis_delimited_date

Author: anmyachev

pandas/tests/io/parser/test_parse_dates.py

@@ -906,24 +906,25 @@ def test_parse_delimited_date_swap(all_parsers, datestring,
     min_value=date(1000, 1, 1),
     max_value=date(9999, 12, 31)
 )
-_DEFAULT_DATETIME = datetime(1, 1, 1).replace(hour=0, minute=0,
-                                              second=0, microsecond=0)
+_DEFAULT_DATETIME = datetime(1, 1, 1)
 
 
 @given(gen_random_datetime)
-@pytest.mark.parametrize("date_format, delimiters, dayfirst", [
-    ("%m %d %Y", " -./", False),
-    ("%m %d %Y", " -./", True),
-    ("%d %m %Y", " -./", True),
-    ("%d %m %Y", " -./", False),
-    ("%m %Y", " -/", False),
-    ("%m %Y", " -/", True)
+@pytest.mark.parametrize("delimiter", list(" -./"))
+@pytest.mark.parametrize("dayfirst", [True, False])
+@pytest.mark.parametrize("date_format", [
+    "%m %d %Y",
+    "%d %m %Y",
+    "%m %Y",
+    "%Y %m %d"
 ])
-def test_hypothesis_delimited_date(date_format, delimiters, dayfirst, date):
-    date_strings = [date.strftime(date_format.replace(' ', delim))
-                    for delim in delimiters]
-    for date_string in date_strings:
-        result = parse_datetime_string(date_string, dayfirst=dayfirst)
-        expected = du_parse(date_string, default=_DEFAULT_DATETIME,
-                            dayfirst=dayfirst, yearfirst=False)
-        assert result == expected
+def test_hypothesis_delimited_date(date_format, dayfirst, delimiter, date):
+    if date_format == "%m %Y" and delimiter == ".":
+        # parse_datetime_string cannot reliably tell whether e.g. %m.%Y
+        # is a float or a date, thus we skip it
+        pytest.skip()
+    date_string = date.strftime(date_format.replace(' ', delimiter))
+    result = parse_datetime_string(date_string, dayfirst=dayfirst)
+    expected = du_parse(date_string, default=_DEFAULT_DATETIME,
+                        dayfirst=dayfirst, yearfirst=False)
+    assert result == expected