TST: Add regression tests for GH#63388 (IntervalIndex copy behavior)

Author: zacharym-collins

pandas/tests/copy_view/index/test_intervalindex.py

@@ -0,0 +1,32 @@
+import numpy as np
+
+from pandas import (
+    IntervalIndex,
+    Series,
+    Interval,
+    array,
+)
+import pandas._testing as tm
+from pandas.tests.copy_view.util import get_array
+
+
+def test_constructor_copy_input_interval_ea_default():
+    # GH 63388
+    arr = array([Interval(0, 1), Interval(1, 2)])
+    idx = IntervalIndex(arr)
+    assert not tm.shares_memory(arr, idx.array)
+
+
+def test_series_from_temporary_intervalindex_readonly_data():
+    # GH 63388
+    arr = array([Interval(0, 1), Interval(1, 2)])
+    arr._left.flags.writeable = False
+    arr._right.flags.writeable = False
+    ser = Series(IntervalIndex(arr))
+    assert not np.shares_memory(arr._left, get_array(ser)._left)
+    ser.iloc[0] = Interval(5, 6)
+    expected = Series(
+        [Interval(5, 6), Interval(1, 2)], 
+        dtype='interval[int64, right]'
+    )
+    tm.assert_series_equal(ser, expected)