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.venv/Lib/site-packages/pandas/tests/indexes/period/test_tools.py

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+import numpy as np
+import pytest
+
+from pandas import (
+    Period,
+    PeriodIndex,
+    period_range,
+)
+import pandas._testing as tm
+
+
+class TestPeriodRepresentation:
+    """
+    Wish to match NumPy units
+    """
+
+    def _check_freq(self, freq, base_date):
+        rng = period_range(start=base_date, periods=10, freq=freq)
+        exp = np.arange(10, dtype=np.int64)
+
+        tm.assert_numpy_array_equal(rng.asi8, exp)
+
+    def test_annual(self):
+        self._check_freq("A", 1970)
+
+    def test_monthly(self):
+        self._check_freq("M", "1970-01")
+
+    @pytest.mark.parametrize("freq", ["W-THU", "D", "B", "H", "T", "S", "L", "U", "N"])
+    def test_freq(self, freq):
+        self._check_freq(freq, "1970-01-01")
+
+
+class TestPeriodIndexConversion:
+    def test_tolist(self):
+        index = period_range(freq="A", start="1/1/2001", end="12/1/2009")
+        rs = index.tolist()
+        for x in rs:
+            assert isinstance(x, Period)
+
+        recon = PeriodIndex(rs)
+        tm.assert_index_equal(index, recon)