Update test_bytes.py from CPython v3.11.2

Author: MegasKomnenos

Lib/test/test_bytes.py

@@ -721,6 +721,24 @@ def test_mod(self):
         self.assertEqual(b, b'hello,\x00world!')
         self.assertIs(type(b), self.type2test)
 
+        def check(fmt, vals, result):
+            b = self.type2test(fmt)
+            b = b % vals
+            self.assertEqual(b, result)
+            self.assertIs(type(b), self.type2test)
+
+        # A set of tests adapted from test_unicode:UnicodeTest.test_formatting
+        check(b'...%(foo)b...', {b'foo':b"abc"}, b'...abc...')
+        check(b'...%(f(o)o)b...', {b'f(o)o':b"abc", b'foo':b'bar'}, b'...abc...')
+        check(b'...%(foo)b...', {b'foo':b"abc",b'def':123}, b'...abc...')
+        check(b'%*b', (5, b'abc',), b'  abc')
+        check(b'%*b', (-5, b'abc',), b'abc  ')
+        check(b'%*.*b', (5, 2, b'abc',), b'   ab')
+        check(b'%*.*b', (5, 3, b'abc',), b'  abc')
+        check(b'%i %*.*b', (10, 5, 3, b'abc',), b'10   abc')
+        check(b'%i%b %*.*b', (10, b'3', 5, 3, b'abc',), b'103   abc')
+        check(b'%c', b'a', b'a')
+
     def test_imod(self):
         b = self.type2test(b'hello, %b!')
         orig = b
@@ -991,6 +1009,18 @@ def test_sq_item(self):
 class BytesTest(BaseBytesTest, unittest.TestCase):
     type2test = bytes
 
+    def test__bytes__(self):
+        foo = b'foo\x00bar'
+        self.assertEqual(foo.__bytes__(), foo)
+        self.assertEqual(type(foo.__bytes__()), self.type2test)
+
+        class bytes_subclass(bytes):
+            pass
+
+        bar = bytes_subclass(b'bar\x00foo')
+        self.assertEqual(bar.__bytes__(), bar)
+        self.assertEqual(type(bar.__bytes__()), self.type2test)
+
     def test_getitem_error(self):
         b = b'python'
         msg = "byte indices must be integers or slices"
@@ -1658,8 +1688,8 @@ def delslice():
 
     @test.support.cpython_only
     def test_obsolete_write_lock(self):
-        from _testcapi import getbuffer_with_null_view
-        self.assertRaises(BufferError, getbuffer_with_null_view, bytearray())
+        _testcapi = import_helper.import_module('_testcapi')
+        self.assertRaises(BufferError, _testcapi.getbuffer_with_null_view, bytearray())
 
     def test_iterator_pickling2(self):
         orig = bytearray(b'abc')
@@ -1718,6 +1748,23 @@ def test_repeat_after_setslice(self):
         self.assertEqual(b1, b)
         self.assertEqual(b3, b'xcxcxc')
 
+    def test_mutating_index(self):
+        class Boom:
+            def __index__(self):
+                b.clear()
+                return 0
+
+        with self.subTest("tp_as_mapping"):
+            b = bytearray(b'Now you see me...')
+            with self.assertRaises(IndexError):
+                b[0] = Boom()
+
+        with self.subTest("tp_as_sequence"):
+            _testcapi = import_helper.import_module('_testcapi')
+            b = bytearray(b'Now you see me...')
+            with self.assertRaises(IndexError):
+                _testcapi.sequence_setitem(b, 0, Boom())
+
 
 class AssortedBytesTest(unittest.TestCase):
     #
@@ -1948,28 +1995,30 @@ def test_join(self):
     def test_pickle(self):
         a = self.type2test(b"abcd")
         a.x = 10
-        a.y = self.type2test(b"efgh")
+        a.z = self.type2test(b"efgh")
         for proto in range(pickle.HIGHEST_PROTOCOL + 1):
             b = pickle.loads(pickle.dumps(a, proto))
             self.assertNotEqual(id(a), id(b))
             self.assertEqual(a, b)
             self.assertEqual(a.x, b.x)
-            self.assertEqual(a.y, b.y)
+            self.assertEqual(a.z, b.z)
             self.assertEqual(type(a), type(b))
-            self.assertEqual(type(a.y), type(b.y))
+            self.assertEqual(type(a.z), type(b.z))
+            self.assertFalse(hasattr(b, 'y'))
 
     def test_copy(self):
         a = self.type2test(b"abcd")
         a.x = 10
-        a.y = self.type2test(b"efgh")
+        a.z = self.type2test(b"efgh")
         for copy_method in (copy.copy, copy.deepcopy):
             b = copy_method(a)
             self.assertNotEqual(id(a), id(b))
             self.assertEqual(a, b)
             self.assertEqual(a.x, b.x)
-            self.assertEqual(a.y, b.y)
+            self.assertEqual(a.z, b.z)
             self.assertEqual(type(a), type(b))
-            self.assertEqual(type(a.y), type(b.y))
+            self.assertEqual(type(a.z), type(b.z))
+            self.assertFalse(hasattr(b, 'y'))
 
     def test_fromhex(self):
         b = self.type2test.fromhex('1a2B30')
@@ -2002,6 +2051,9 @@ def __init__(me, *args, **kwargs):
 class ByteArraySubclass(bytearray):
     pass
 
+class ByteArraySubclassWithSlots(bytearray):
+    __slots__ = ('x', 'y', '__dict__')
+
 class BytesSubclass(bytes):
     pass
 
@@ -2022,6 +2074,9 @@ def __init__(me, newarg=1, *args, **kwargs):
         x = subclass(newarg=4, source=b"abcd")
         self.assertEqual(x, b"abcd")
 
+class ByteArraySubclassWithSlotsTest(SubclassTest, unittest.TestCase):
+    basetype = bytearray
+    type2test = ByteArraySubclassWithSlots
 
 class BytesSubclassTest(SubclassTest, unittest.TestCase):
     basetype = bytes