diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 3e84b3c..a378c9b 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -27,6 +27,9 @@ jobs:
         - os: ubuntu-latest
           python: 3.9
           toxenv: py
+        - os: ubuntu-latest
+          python: '3.10.0-alpha - 3.10.999'
+          toxenv: py
         # windows
         - os: windows-latest
           python: 3.6
diff --git a/pytest.ini b/pytest.ini
index a72e0e1..1978251 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -1,4 +1,6 @@
 [pytest]
 norecursedirs = .git .* *.egg* old docs dist build
 addopts = -rw
-filterwarnings = error
+filterwarnings =
+    error
+    ignore:SelectableGroups:DeprecationWarning
diff --git a/tests/integration/test_main.py b/tests/integration/test_main.py
index 16ecba0..8ad7654 100644
--- a/tests/integration/test_main.py
+++ b/tests/integration/test_main.py
@@ -191,8 +191,10 @@ def test_tokenization_error_but_not_syntax_error(tmpdir, capsys):
         expected = "t.py:2:1: E999 SyntaxError: end of file (EOF) in multi-line statement\n"  # noqa: E501
     elif sys.version_info < (3, 8):  # pragma: no cover (<cp38)
         expected = "t.py:2:1: E902 TokenError: EOF in multi-line statement\n"
-    else:  # pragma: no cover (cp38+)
+    elif sys.version_info < (3, 10):  # pragma: no cover (cp38+)
         expected = "t.py:1:8: E999 SyntaxError: unexpected EOF while parsing\n"
+    else:  # pragma: no cover (cp310+)
+        expected = "t.py:1:10: E999 SyntaxError: unexpected EOF while parsing\n"  # noqa: E501
 
     out, err = capsys.readouterr()
     assert out == expected
@@ -207,8 +209,10 @@ def test_tokenization_error_is_a_syntax_error(tmpdir, capsys):
 
     if hasattr(sys, "pypy_version_info"):  # pragma: no cover (pypy)
         expected = "t.py:3:2: E999 IndentationError: unindent does not match any outer indentation level\n"  # noqa: E501
-    else:  # pragma: no cover (cpython)
+    elif sys.version_info < (3, 10):  # pragma: no cover (<cp310)
         expected = "t.py:3:5: E999 IndentationError: unindent does not match any outer indentation level\n"  # noqa: E501
+    else:  # pragma: no cover (cp310+)
+        expected = "t.py:3:7: E999 IndentationError: unindent does not match any outer indentation level\n"  # noqa: E501
 
     out, err = capsys.readouterr()
     assert out == expected
diff --git a/tests/unit/test_plugin_type_manager.py b/tests/unit/test_plugin_type_manager.py
index 4db1ea9..1b823af 100644
--- a/tests/unit/test_plugin_type_manager.py
+++ b/tests/unit/test_plugin_type_manager.py
@@ -34,20 +34,13 @@ def create_mapping_manager_mock(plugins):
     return manager_mock
 
 
-def create_manager_with_plugins(plugins):
-    """Create a fake PluginManager with a plugins dictionary."""
-    manager_mock = mock.create_autospec(manager.PluginManager)
-    manager_mock.plugins = plugins
-    return manager_mock
-
-
 class FakeTestType(manager.PluginTypeManager):
     """Fake PluginTypeManager."""
 
     namespace = TEST_NAMESPACE
 
 
-@mock.patch("flake8.plugins.manager.PluginManager")
+@mock.patch("flake8.plugins.manager.PluginManager", autospec=True)
 def test_instantiates_a_manager(PluginManager):  # noqa: N803
     """Verify we create a PluginManager on instantiation."""
     FakeTestType()
@@ -55,7 +48,7 @@ def test_instantiates_a_manager(PluginManager):  # noqa: N803
     PluginManager.assert_called_once_with(TEST_NAMESPACE, local_plugins=None)
 
 
-@mock.patch("flake8.plugins.manager.PluginManager")
+@mock.patch("flake8.plugins.manager.PluginManager", autospec=True)
 def test_proxies_names_to_manager(PluginManager):  # noqa: N803
     """Verify we proxy the names attribute."""
     PluginManager.return_value = mock.Mock(names=["T100", "T200", "T300"])
@@ -64,7 +57,7 @@ def test_proxies_names_to_manager(PluginManager):  # noqa: N803
     assert type_mgr.names == ["T100", "T200", "T300"]
 
 
-@mock.patch("flake8.plugins.manager.PluginManager")
+@mock.patch("flake8.plugins.manager.PluginManager", autospec=True)
 def test_proxies_plugins_to_manager(PluginManager):  # noqa: N803
     """Verify we proxy the plugins attribute."""
     PluginManager.return_value = mock.Mock(plugins=["T100", "T200", "T300"])
@@ -86,7 +79,7 @@ def test_generate_call_function():
     assert func(plugin) is optmanager
 
 
-@mock.patch("flake8.plugins.manager.PluginManager")
+@mock.patch("flake8.plugins.manager.PluginManager", autospec=True)
 def test_load_plugins(PluginManager):  # noqa: N803
     """Verify load plugins loads *every* plugin."""
     # Create a bunch of fake plugins
@@ -191,12 +184,12 @@ def test_provide_options(PluginManager):  # noqa: N803
         plugin.provide_options.assert_called_with(optmanager, options, [])
 
 
-@mock.patch("flake8.plugins.manager.PluginManager")
+@mock.patch("flake8.plugins.manager.PluginManager", autospec=True)
 def test_proxy_contains_to_managers_plugins_dict(PluginManager):  # noqa: N803
     """Verify that we proxy __contains__ to the manager's dictionary."""
     plugins = {"T10%i" % i: create_plugin_mock() for i in range(8)}
     # Return our PluginManager mock
-    PluginManager.return_value = create_manager_with_plugins(plugins)
+    PluginManager.return_value.plugins = plugins
 
     type_mgr = FakeTestType()
     for i in range(8):
@@ -209,7 +202,7 @@ def test_proxies_getitem_to_managers_plugins_dict(PluginManager):  # noqa: N803
     """Verify that we can use the PluginTypeManager like a dictionary."""
     plugins = {"T10%i" % i: create_plugin_mock() for i in range(8)}
     # Return our PluginManager mock
-    PluginManager.return_value = create_manager_with_plugins(plugins)
+    PluginManager.return_value.plugins = plugins
 
     type_mgr = FakeTestType()
     for i in range(8):