[Python-checkins] cpython (merge 3.5 -> default): Issue #26492: Added additional tests for exhausted iterators of mutable

[serhiy.storchaka]

https://hg.python.org/cpython/rev/b4ea00d50e7e
changeset:   100804:b4ea00d50e7e
parent:      100801:73ce47d4a7b2
parent:      100803:89ba67ee83d6
user:        Serhiy Storchaka <storchaka at gmail.com>
date:        Wed Mar 30 21:01:45 2016 +0300
summary:
  Issue #26492: Added additional tests for exhausted iterators of mutable sequences.

files:
  Lib/test/list_tests.py |  11 +++++++++++
  Lib/test/test_bytes.py |   2 ++
  Lib/test/test_iter.py  |  11 +++++++++++
  3 files changed, 24 insertions(+), 0 deletions(-)


diff --git a/Lib/test/list_tests.py b/Lib/test/list_tests.py
--- a/Lib/test/list_tests.py
+++ b/Lib/test/list_tests.py
@@ -593,3 +593,14 @@
             def __iter__(self):
                 raise KeyboardInterrupt
         self.assertRaises(KeyboardInterrupt, list, F())
+
+    def test_exhausted_iterator(self):
+        a = self.type2test([1, 2, 3])
+        exhit = iter(a)
+        empit = iter(a)
+        for x in exhit:  # exhaust the iterator
+            next(empit)  # not exhausted
+        a.append(9)
+        self.assertEqual(list(exhit), [])
+        self.assertEqual(list(empit), [9])
+        self.assertEqual(a, self.type2test([1, 2, 3, 9]))
diff --git a/Lib/test/test_bytes.py b/Lib/test/test_bytes.py
--- a/Lib/test/test_bytes.py
+++ b/Lib/test/test_bytes.py
@@ -17,6 +17,7 @@
 import test.support
 import test.string_tests
 import test.buffer_tests
+import test.list_tests
 from test.support import bigaddrspacetest, MAX_Py_ssize_t
 
 
@@ -1418,6 +1419,7 @@
             b[:] = data
             self.assertEqual(list(it), [])
 
+    test_exhausted_iterator = test.list_tests.CommonTest.test_exhausted_iterator
 
 class AssortedBytesTest(unittest.TestCase):
     #
diff --git a/Lib/test/test_iter.py b/Lib/test/test_iter.py
--- a/Lib/test/test_iter.py
+++ b/Lib/test/test_iter.py
@@ -190,6 +190,17 @@
             self.assertTrue(isinstance(it, collections.abc.Iterator))
             self.assertEqual(list(it), [])
 
+    def test_mutating_seq_class_exhausted_iter(self):
+        a = SequenceClass(5)
+        exhit = iter(a)
+        empit = iter(a)
+        for x in exhit:  # exhaust the iterator
+            next(empit)  # not exhausted
+        a.n = 7
+        self.assertEqual(list(exhit), [])
+        self.assertEqual(list(empit), [5, 6])
+        self.assertEqual(list(a), [0, 1, 2, 3, 4, 5, 6])
+
     # Test a new_style class with __iter__ but no next() method
     def test_new_style_iter_class(self):
         class IterClass(object):

-- 
Repository URL: https://hg.python.org/cpython