Use bytes literals for _p_oid values.

BTrees/tests/test__base.py

@@ -1783,7 +1783,7 @@ class Test_Tree(unittest.TestCase):
 
     def test__set_calls_readCurrent_on_jar(self):
         tree = self._makeOne()
-        tree._p_oid = 'OID'
+        tree._p_oid = b'OID'
         tree._p_serial = '01234567'
         tree._p_jar = jar = _Jar()
         tree._set('a', 'b')
@@ -1839,7 +1839,7 @@ class Test_Tree(unittest.TestCase):
 
     def test__del_calls_readCurrent_on_jar(self):
         tree = self._makeOne({'a': 'b'})
-        tree._p_oid = 'OID'
+        tree._p_oid = b'OID'
         tree._p_serial = '01234567'
         tree._p_jar = jar = _Jar()
         tree._del('a')
@@ -1898,7 +1898,7 @@ class Test_Tree(unittest.TestCase):
         bucket = tree._firstbucket
         jar = _Jar()
         bucket._p_jar = jar
-        bucket._p_oid = 'OID'
+        bucket._p_oid = b'OID'
         self.assertEqual(tree.__getstate__(), ((bucket,), bucket))
 
     def test___getstate___multiple_buckets(self):

BTrees/tests/test_check.py

@@ -149,10 +149,10 @@ class Test_type_and_adr(unittest.TestCase):
     def test_type_and_adr_w_oid(self):
         from BTrees.utils import oid_repr
         class WithOid(object):
-            _p_oid = 'DEADBEEF'
+            _p_oid = b'DEADBEEF'
         t_and_a = self._callFUT(WithOid())
         self.assertTrue(t_and_a.startswith('WithOid (0x'))
-        self.assertTrue(t_and_a.endswith('oid=%s)' % oid_repr('DEADBEEF')))
+        self.assertTrue(t_and_a.endswith('oid=%s)' % oid_repr(b'DEADBEEF')))
 
     def test_type_and_adr_wo_oid(self):
         class WithoutOid(object):