changeset:   100803:89ba67ee83d6
branch:      3.5
parent:      100800:905b5944119c
user:        Serhiy Storchaka <storchaka@gmail.com>
date:        Wed Mar 30 21:01:26 2016 +0300
files:       Lib/test/list_tests.py Lib/test/test_bytes.py Lib/test/test_iter.py
description:
Issue #26492: Added additional tests for exhausted iterators of mutable sequences.


diff -r 905b5944119c -r 89ba67ee83d6 Lib/test/list_tests.py
--- a/Lib/test/list_tests.py	Wed Mar 30 20:40:02 2016 +0300
+++ b/Lib/test/list_tests.py	Wed Mar 30 21:01:26 2016 +0300
@@ -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 -r 905b5944119c -r 89ba67ee83d6 Lib/test/test_bytes.py
--- a/Lib/test/test_bytes.py	Wed Mar 30 20:40:02 2016 +0300
+++ b/Lib/test/test_bytes.py	Wed Mar 30 21:01:26 2016 +0300
@@ -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
 
 
@@ -1323,6 +1324,7 @@
             b[:] = data
             self.assertEqual(list(it), [])
 
+    test_exhausted_iterator = test.list_tests.CommonTest.test_exhausted_iterator
 
 class AssortedBytesTest(unittest.TestCase):
     #
diff -r 905b5944119c -r 89ba67ee83d6 Lib/test/test_iter.py
--- a/Lib/test/test_iter.py	Wed Mar 30 20:40:02 2016 +0300
+++ b/Lib/test/test_iter.py	Wed Mar 30 21:01:26 2016 +0300
@@ -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):