Drop nose and mock from the tests: nose does not run on Python 3.12+, and
mock is unittest.mock. pytest.raises takes the same callable form as
nose's assert_raises.

diff -ru a/tests/expiringdict_extended_test.py b/tests/expiringdict_extended_test.py
--- a/tests/expiringdict_extended_test.py
+++ b/tests/expiringdict_extended_test.py
@@ -1,4 +1,7 @@
-from nose.tools import eq_
+
+def eq_(a, b, msg=None):
+    assert a == b, msg or '%r != %r' % (a, b)
+
 
 from expiringdict import ExpiringDict
 import dill
diff -ru a/tests/expiringdict_test.py b/tests/expiringdict_test.py
--- a/tests/expiringdict_test.py
+++ b/tests/expiringdict_test.py
@@ -1,7 +1,16 @@
 from time import sleep
 
-from mock import Mock, patch
-from nose.tools import assert_raises, eq_, ok_
+from unittest.mock import Mock, patch
+
+from pytest import raises as assert_raises
+
+
+def eq_(a, b, msg=None):
+    assert a == b, msg or '%r != %r' % (a, b)
+
+
+def ok_(expr, msg=None):
+    assert expr, msg
 
 from expiringdict import ExpiringDict