diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 86a2d9b84..a1bcd1917 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -627,7 +627,7 @@ Removals
   See our `docs <https://docs.pytest.org/en/latest/deprecations.html#passing-command-line-string-to-pytest-main>`__ on information on how to update your code.
 
 
-- `#3086 <https://github.com/pytest-dev/pytest/issues/3086>`_: ``[pytest]`` section in **setup.cfg** files is not longer supported, use ``[tool:pytest]`` instead. ``setup.cfg`` files
+- `#3086 <https://github.com/pytest-dev/pytest/issues/3086>`_: ``[pytest]`` section in **setup.cfg** files is no longer supported, use ``[tool:pytest]`` instead. ``setup.cfg`` files
   are meant for use with ``distutils``, and a section named ``pytest`` has notoriously been a source of conflicts and bugs.
 
   Note that for **pytest.ini** and **tox.ini** files the section remains ``[pytest]``.
@@ -1849,7 +1849,7 @@ Features
   exits the debugger. On python 3.2 and higher, use CTRL+D. (`#3299
   <https://github.com/pytest-dev/pytest/issues/3299>`_)
 
-- pytest not longer changes the log level of the root logger when the
+- pytest no longer changes the log level of the root logger when the
   ``log-level`` parameter has greater numeric value than that of the level of
   the root logger, which makes it play better with custom logging configuration
   in user code. (`#3307 <https://github.com/pytest-dev/pytest/issues/3307>`_)
diff --git a/testing/conftest.py b/testing/conftest.py
index ecc945279..4badf3016 100644
--- a/testing/conftest.py
+++ b/testing/conftest.py
@@ -11,9 +11,10 @@ def pytest_collection_modifyitems(config, items):
     """
     fast_items = []
     slow_items = []
+    slowest_items = []
     neutral_items = []
 
-    slow_fixturenames = ("testdir",)
+    spawn_names = {"spawn_pytest", "spawn"}
 
     for item in items:
         try:
@@ -23,15 +24,19 @@ def pytest_collection_modifyitems(config, items):
             # (https://github.com/pytest-dev/pytest/issues/5070)
             neutral_items.append(item)
         else:
-            if any(x for x in fixtures if x in slow_fixturenames):
-                slow_items.append(item)
+            if "testdir" in fixtures:
+                if spawn_names.intersection(item.function.__code__.co_names):
+                    item.add_marker(pytest.mark.uses_pexpect)
+                    slowest_items.append(item)
+                else:
+                    slow_items.append(item)
             else:
                 marker = item.get_closest_marker("slow")
                 if marker:
-                    slow_items.append(item)
+                    slowest_items.append(item)
                 else:
                     fast_items.append(item)
 
-    items[:] = fast_items + neutral_items + slow_items
+    items[:] = fast_items + neutral_items + slow_items + slowest_items
 
     yield
diff --git a/tox.ini b/tox.ini
index 1f024b2f5..a04f91ae5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -175,6 +175,8 @@ markers =
     baz
     # conftest.py reorders tests moving slow ones to the end of the list
     slow
+    # experimental mark for all tests using pexpect
+    uses_pexpect
 
 [flake8]
 max-line-length = 120