conftest: add uses_pexpect mark

Author: blueyed

testing/conftest.py

@@ -13,7 +13,7 @@ def pytest_collection_modifyitems(config, items):
     slow_items = []
     neutral_items = []
 
-    slow_fixturenames = ("testdir",)
+    spawn_names = {"spawn_pytest", "spawn"}
 
     for item in items:
         try:
@@ -23,7 +23,9 @@ 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):
+            if "testdir" in fixtures:
+                if spawn_names.intersection(item.function.__code__.co_names):
+                    item.add_marker(pytest.mark.uses_pexpect)
                 slow_items.append(item)
             else:
                 marker = item.get_closest_marker("slow")

tox.ini

@@ -175,6 +175,7 @@ markers =
     baz
     # conftest.py reorders tests moving slow ones to the end of the list
     slow
+    uses_pexpect
 
 [flake8]
 max-line-length = 120