Test buffer content

Author: marcelm

Lib/test/test_io/test_memoryio.py

@@ -616,8 +616,8 @@ def test_peek(self):
         # Length greater than DEFAULT_BUFFER_SIZE
         buf = self.buftype("1234567890" * io.DEFAULT_BUFFER_SIZE)
         with self.ioclass(buf) as memio:
-            self.assertEqual(len(memio.peek()), len(buf))
-            self.assertEqual(len(memio.peek(io.DEFAULT_BUFFER_SIZE + 100)), io.DEFAULT_BUFFER_SIZE + 100)
+            self.assertEqual(memio.peek(), buf)
+            self.assertEqual(memio.peek(io.DEFAULT_BUFFER_SIZE + 100), buf[:io.DEFAULT_BUFFER_SIZE + 100])
 
         # Current position beyond buffer end
         with self.ioclass(buf) as memio: