8th day of python challenges 111-117

venv/lib/python3.6/site-packages/pandas/tests/tslibs/test_ccalendar.py

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+from datetime import datetime
+
+import numpy as np
+import pytest
+
+from pandas._libs.tslibs import ccalendar
+
+
+@pytest.mark.parametrize(
+    "date_tuple,expected",
+    [
+        ((2001, 3, 1), 60),
+        ((2004, 3, 1), 61),
+        ((1907, 12, 31), 365),  # End-of-year, non-leap year.
+        ((2004, 12, 31), 366),  # End-of-year, leap year.
+    ],
+)
+def test_get_day_of_year_numeric(date_tuple, expected):
+    assert ccalendar.get_day_of_year(*date_tuple) == expected
+
+
+def test_get_day_of_year_dt():
+    dt = datetime.fromordinal(1 + np.random.randint(365 * 4000))
+    result = ccalendar.get_day_of_year(dt.year, dt.month, dt.day)
+
+    expected = (dt - dt.replace(month=1, day=1)).days + 1
+    assert result == expected