bpo-29727: Register array.array as a MutableSequence (GH-21338)
diff --git a/Lib/test/test_array.py b/Lib/test/test_array.py
index 6af90df..c423f54 100644
--- a/Lib/test/test_array.py
+++ b/Lib/test/test_array.py
@@ -2,6 +2,7 @@
Roger E. Masse
"""
+import collections.abc
import unittest
from test import support
from test.support import os_helper
@@ -29,6 +30,10 @@
class MiscTest(unittest.TestCase):
+ def test_array_is_sequence(self):
+ self.assertIsInstance(array.array("B"), collections.abc.MutableSequence)
+ self.assertIsInstance(array.array("B"), collections.abc.Reversible)
+
def test_bad_constructor(self):
self.assertRaises(TypeError, array.array)
self.assertRaises(TypeError, array.array, spam=42)
@@ -331,6 +336,67 @@
self.assertEqual(list(empit), [self.outside])
self.assertEqual(list(a), list(self.example) + [self.outside])
+ def test_reverse_iterator(self):
+ a = array.array(self.typecode, self.example)
+ self.assertEqual(list(a), list(self.example))
+ self.assertEqual(list(reversed(a)), list(iter(a))[::-1])
+
+ def test_reverse_iterator_picking(self):
+ orig = array.array(self.typecode, self.example)
+ data = list(orig)
+ data2 = [self.outside] + data
+ rev_data = data[len(data)-2::-1] + [self.outside]
+ for proto in range(pickle.HIGHEST_PROTOCOL + 1):
+ # initial iterator
+ itorig = reversed(orig)
+ d = pickle.dumps((itorig, orig), proto)
+ it, a = pickle.loads(d)
+ a.insert(0, self.outside)
+ self.assertEqual(type(it), type(itorig))
+ self.assertEqual(list(it), rev_data)
+ self.assertEqual(list(a), data2)
+
+ # running iterator
+ next(itorig)
+ d = pickle.dumps((itorig, orig), proto)
+ it, a = pickle.loads(d)
+ a.insert(0, self.outside)
+ self.assertEqual(type(it), type(itorig))
+ self.assertEqual(list(it), rev_data[1:])
+ self.assertEqual(list(a), data2)
+
+ # empty iterator
+ for i in range(1, len(data)):
+ next(itorig)
+ d = pickle.dumps((itorig, orig), proto)
+ it, a = pickle.loads(d)
+ a.insert(0, self.outside)
+ self.assertEqual(type(it), type(itorig))
+ self.assertEqual(list(it), [])
+ self.assertEqual(list(a), data2)
+
+ # exhausted iterator
+ self.assertRaises(StopIteration, next, itorig)
+ d = pickle.dumps((itorig, orig), proto)
+ it, a = pickle.loads(d)
+ a.insert(0, self.outside)
+ self.assertEqual(list(it), [])
+ self.assertEqual(list(a), data2)
+
+ def test_exhausted_reverse_iterator(self):
+ a = array.array(self.typecode, self.example)
+ self.assertEqual(list(a), list(self.example))
+ exhit = reversed(a)
+ empit = reversed(a)
+ for x in exhit: # exhaust the iterator
+ next(empit) # Pointing past the 0th position.
+ a.insert(0, self.outside)
+ self.assertEqual(list(exhit), [])
+ # The iterator index points past the 0th position so inserting
+ # an element in the beggining does not make it appear.
+ self.assertEqual(list(empit), [])
+ self.assertEqual(list(a), [self.outside] + list(self.example))
+
def test_insert(self):
a = array.array(self.typecode, self.example)
a.insert(0, self.example[0])