Fix test deprecation warning on Python 3.11

Fixes #112.

CHANGES.rst

@@ -11,6 +11,9 @@
 
 - Drop ``zope.schema._compat`` module.
 
+- Fix test deprecation warning on Python 3.11.
+ (`#112 <https://github.com/zopefoundation/zope.schema/issues/112>`_)
+
 6.2.1 (2022-09-14)
 ==================
 

src/zope/schema/tests/test__bootstrapfields.py

@@ -47,15 +47,13 @@ def test_class_conforms_to_iface(self):
  __traceback_info__ = cls
  for iface in self._getTargetInterfaces():
  verifyClass(iface, cls)
- return verifyClass
 
  def test_instance_conforms_to_iface(self):
  from zope.interface.verify import verifyObject
  instance = self._makeOne()
  __traceback_info__ = instance
  for iface in self._getTargetInterfaces():
  verifyObject(iface, instance)
- return verifyObject
 
  def test_iface_is_first_in_sro(self):
  from zope.interface import implementedBy
@@ -1229,17 +1227,18 @@ def _getTargetInterface(self):
  return INumber
 
  def test_class_conforms_to_iface(self):
+ from zope.interface.verify import verifyClass
  from zope.schema._bootstrapinterfaces import IFromBytes
  from zope.schema._bootstrapinterfaces import IFromUnicode
- verifyClass = super(NumberTests, self).test_class_conforms_to_iface()
+ super(NumberTests, self).test_class_conforms_to_iface()
  verifyClass(IFromUnicode, self._getTargetClass())
  verifyClass(IFromBytes, self._getTargetClass())
 
  def test_instance_conforms_to_iface(self):
+ from zope.interface.verify import verifyObject
  from zope.schema._bootstrapinterfaces import IFromBytes
  from zope.schema._bootstrapinterfaces import IFromUnicode
- verifyObject = (
- super(NumberTests, self).test_instance_conforms_to_iface())
+ super(NumberTests, self).test_instance_conforms_to_iface()
  verifyObject(IFromUnicode, self._makeOne())
  verifyObject(IFromBytes, self._makeOne())