diff --git a/tests/test_buffers.py b/tests/test_buffers.py
index 01cdc2de..1114232e 100644
--- a/tests/test_buffers.py
+++ b/tests/test_buffers.py
@@ -185,6 +185,8 @@ def tearDown(self):
     def test_prepare_not_seekable(self):
         f = KindaFilelike(b"abc")
         inst = self._makeOne(f)
+        self.assertFalse(hasattr(inst, 'seek'))
+        self.assertFalse(hasattr(inst, 'tell'))
         result = inst.prepare()
         self.assertEqual(result, False)
         self.assertEqual(inst.remain, 0)
@@ -200,6 +202,8 @@ def test_prepare_not_seekable_closeable(self):
     def test_prepare_seekable_closeable(self):
         f = Filelike(b"abc", close=1, tellresults=[0, 10])
         inst = self._makeOne(f)
+        self.assertEqual(inst.seek, f.seek)
+        self.assertEqual(inst.tell, f.tell)
         result = inst.prepare()
         self.assertEqual(result, 10)
         self.assertEqual(inst.remain, 10)