gh-131357: Add some extra tests for empty bytes and bytearray (#134458)

diff --git a/Lib/test/test_capi/test_bytearray.py b/Lib/test/test_capi/test_bytearray.py
index dfa98de9f007d88f045e087087fb9a5971ad2ac7..52565ea34c61b89aeae0c6f30267646893005d06 100644 (file)
--- a/Lib/test/test_capi/test_bytearray.py
+++ b/Lib/test/test_capi/test_bytearray.py
@@ -66,6 +66,7 @@ class CAPITest(unittest.TestCase):
         # Test PyByteArray_FromObject()
         fromobject = _testlimitedcapi.bytearray_fromobject
 
+        self.assertEqual(fromobject(b''), bytearray(b''))
         self.assertEqual(fromobject(b'abc'), bytearray(b'abc'))
         self.assertEqual(fromobject(bytearray(b'abc')), bytearray(b'abc'))
         self.assertEqual(fromobject(ByteArraySubclass(b'abc')), bytearray(b'abc'))
@@ -115,6 +116,7 @@ class CAPITest(unittest.TestCase):
         self.assertEqual(concat(b'abc', bytearray(b'def')), bytearray(b'abcdef'))
         self.assertEqual(concat(bytearray(b'abc'), b''), bytearray(b'abc'))
         self.assertEqual(concat(b'', bytearray(b'def')), bytearray(b'def'))
+        self.assertEqual(concat(bytearray(b''), bytearray(b'')), bytearray(b''))
         self.assertEqual(concat(memoryview(b'xabcy')[1:4], b'def'),
                          bytearray(b'abcdef'))
         self.assertEqual(concat(b'abc', memoryview(b'xdefy')[1:4]),
@@ -150,6 +152,10 @@ class CAPITest(unittest.TestCase):
         self.assertEqual(resize(ba, 0), 0)
         self.assertEqual(ba, bytearray())
 
+        ba = bytearray(b'')
+        self.assertEqual(resize(ba, 0), 0)
+        self.assertEqual(ba, bytearray())
+
         ba = ByteArraySubclass(b'abcdef')
         self.assertEqual(resize(ba, 3), 0)
         self.assertEqual(ba, bytearray(b'abc'))

diff --git a/Lib/test/test_capi/test_bytes.py b/Lib/test/test_capi/test_bytes.py
index 86d5692893fc98eac751a864d5cf299efa41b3ac..bc820bd68d9e21d78ad61a867a1140e0dcd41522 100644 (file)
--- a/Lib/test/test_capi/test_bytes.py
+++ b/Lib/test/test_capi/test_bytes.py
@@ -81,6 +81,7 @@ class CAPITest(unittest.TestCase):
         # Test PyBytes_FromObject()
         fromobject = _testlimitedcapi.bytes_fromobject
 
+        self.assertEqual(fromobject(b''), b'')
         self.assertEqual(fromobject(b'abc'), b'abc')
         self.assertEqual(fromobject(bytearray(b'abc')), b'abc')
         self.assertEqual(fromobject(BytesSubclass(b'abc')), b'abc')
@@ -138,6 +139,7 @@ class CAPITest(unittest.TestCase):
         # Test PyBytes_Repr()
         bytes_repr = _testlimitedcapi.bytes_repr
 
+        self.assertEqual(bytes_repr(b'', 0), r"""b''""")
         self.assertEqual(bytes_repr(b'''abc''', 0), r"""b'abc'""")
         self.assertEqual(bytes_repr(b'''abc''', 1), r"""b'abc'""")
         self.assertEqual(bytes_repr(b'''a'b"c"d''', 0), r"""b'a\'b"c"d'""")
@@ -197,6 +199,7 @@ class CAPITest(unittest.TestCase):
         """Test PyBytes_DecodeEscape()"""
         decodeescape = _testlimitedcapi.bytes_decodeescape
 
+        self.assertEqual(decodeescape(b''), b'')
         self.assertEqual(decodeescape(b'abc'), b'abc')
         self.assertEqual(decodeescape(br'\t\n\r\x0b\x0c\x00\\\'\"'),
                          b'''\t\n\r\v\f\0\\'"''')