diff --git a/tests/test__parametrize.py b/tests/test__parametrize.py
index 3af4b22a..31eb9652 100644
--- a/tests/test__parametrize.py
+++ b/tests/test__parametrize.py
@@ -169,6 +169,7 @@ def test_generate_calls_simple():
 
     f = mock.Mock()
     f.__name__ = "f"
+    f.requires = None
     f.some_prop = 42
 
     arg_names = ("abc",)
@@ -202,6 +203,7 @@ def test_generate_calls_multiple_args():
 
     f = mock.Mock()
     f.__name__ = "f"
+    f.requires = None
 
     arg_names = ("foo", "abc")
     call_specs = [
@@ -228,6 +230,7 @@ def test_generate_calls_multiple_args():
 def test_generate_calls_ids():
     f = mock.Mock()
     f.__name__ = "f"
+    f.requires = None
 
     arg_names = ("foo",)
     call_specs = [
diff --git a/tests/test_sessions.py b/tests/test_sessions.py
index f7535958..5bed64a7 100644
--- a/tests/test_sessions.py
+++ b/tests/test_sessions.py
@@ -782,6 +782,7 @@ def make_runner(self):
         func.python = None
         func.venv_backend = None
         func.reuse_venv = False
+        func.requires = []
         runner = nox.sessions.SessionRunner(
             name="test",
             signatures=["test(1, 2)"],
@@ -919,6 +920,7 @@ def test_execute_quit(self):
         def func(session):
             session.error("meep")
 
+        func.requires = []
         runner.func = func
 
         result = runner.execute()
@@ -931,6 +933,7 @@ def test_execute_skip(self):
         def func(session):
             session.skip("meep")
 
+        func.requires = []
         runner.func = func
 
         result = runner.execute()
@@ -988,6 +991,7 @@ def test_execute_failed(self):
         def func(session):
             raise nox.command.CommandFailed()
 
+        func.requires = []
         runner.func = func
 
         result = runner.execute()
@@ -1000,6 +1004,7 @@ def test_execute_interrupted(self):
         def func(session):
             raise KeyboardInterrupt()
 
+        func.requires = []
         runner.func = func
 
         with pytest.raises(KeyboardInterrupt):
@@ -1011,6 +1016,7 @@ def test_execute_exception(self):
         def func(session):
             raise ValueError("meep")
 
+        func.requires = []
         runner.func = func
 
         result = runner.execute()
diff --git a/tests/test_tasks.py b/tests/test_tasks.py
index 926b52d9..3f90e1ac 100644
--- a/tests/test_tasks.py
+++ b/tests/test_tasks.py
@@ -40,6 +40,7 @@ def session_func():
 session_func.venv_backend = None
 session_func.should_warn = dict()
 session_func.tags = []
+session_func.requires = []
 
 
 def session_func_with_python():
@@ -48,6 +49,7 @@ def session_func_with_python():
 
 session_func_with_python.python = "3.8"
 session_func_with_python.venv_backend = None
+session_func_with_python.requires = []
 
 
 def session_func_venv_pythons_warning():