first commit

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

@@ -0,0 +1,58 @@
+import numpy as np
+import pytest
+
+from pandas._libs.tslibs import IncompatibleFrequency
+
+from pandas import (
+    Index,
+    PeriodIndex,
+    period_range,
+)
+import pandas._testing as tm
+
+
+class TestJoin:
+    def test_join_outer_indexer(self):
+        pi = period_range("1/1/2000", "1/20/2000", freq="D")
+
+        result = pi._outer_indexer(pi)
+        tm.assert_extension_array_equal(result[0], pi._values)
+        tm.assert_numpy_array_equal(result[1], np.arange(len(pi), dtype=np.intp))
+        tm.assert_numpy_array_equal(result[2], np.arange(len(pi), dtype=np.intp))
+
+    def test_joins(self, join_type):
+        index = period_range("1/1/2000", "1/20/2000", freq="D")
+
+        joined = index.join(index[:-5], how=join_type)
+
+        assert isinstance(joined, PeriodIndex)
+        assert joined.freq == index.freq
+
+    def test_join_self(self, join_type):
+        index = period_range("1/1/2000", "1/20/2000", freq="D")
+
+        res = index.join(index, how=join_type)
+        assert index is res
+
+    def test_join_does_not_recur(self):
+        df = tm.makeCustomDataframe(
+            3,
+            2,
+            data_gen_f=lambda *args: np.random.randint(2),
+            c_idx_type="p",
+            r_idx_type="dt",
+        )
+        ser = df.iloc[:2, 0]
+
+        res = ser.index.join(df.columns, how="outer")
+        expected = Index(
+            [ser.index[0], ser.index[1], df.columns[0], df.columns[1]], object
+        )
+        tm.assert_index_equal(res, expected)
+
+    def test_join_mismatched_freq_raises(self):
+        index = period_range("1/1/2000", "1/20/2000", freq="D")
+        index3 = period_range("1/1/2000", "1/20/2000", freq="2D")
+        msg = r".*Input has different freq=2D from Period\(freq=D\)"
+        with pytest.raises(IncompatibleFrequency, match=msg):
+            index.join(index3)