Test tell() after peek()

Author: marcelm

Lib/test/test_io/test_memoryio.py

@@ -569,11 +569,12 @@ def test_issue141311(self):
     def test_peek(self):
         buf = self.buftype("1234567890")
         memio = self.ioclass(buf)
-
+        pos = memio.tell()
         self.assertEqual(memio.peek(1), buf[:1])
         self.assertEqual(memio.peek(1), buf[:1])
         self.assertEqual(memio.peek(), buf)
         self.assertEqual(memio.peek(0), buf)
+        self.assertEqual(memio.tell(), pos)
         memio.read(1)
         self.assertEqual(memio.peek(1), buf[1:2])
         self.assertEqual(memio.peek(), buf[1:])