1 files changed, 8 insertions, 0 deletions
diff --git a/Lib/test/test_bytes.py b/Lib/test/test_bytes.py
index a4e5bd9..2813d96 100644
--- a/Lib/test/test_bytes.py
+++ b/Lib/test/test_bytes.py
@@ -817,6 +817,14 @@ class ByteArrayTest(BaseBytesTest):
         self.assertRaises(BufferError, delslice)
         self.assertEquals(b, orig)
 
+    def test_empty_bytearray(self):
+        # Issue #7561: operations on empty bytearrays could crash in many
+        # situations, due to a fragile implementation of the
+        # PyByteArray_AS_STRING() C macro.
+        self.assertRaises(ValueError, int, bytearray(b''))
+        self.assertRaises((ValueError, OSError), os.mkdir, bytearray(b''))
+
+
 class AssortedBytesTest(unittest.TestCase):
     #
     # Test various combinations of bytes and bytearray