feat: Exposed autoused fixture names as global variable for tests (#13171)

Signed-off-by: Élie Goudout <[email protected]>

Author: eliegoudout

AUTHORS

@@ -141,6 +141,7 @@ Eduardo Schettino
 Edward Haigh
 Eero Vaher
 Eli Boyarski
+Élie Goudout
 Elizaveta Shashkova
 Éloi Rivard
 Emil Hjelm

changelog/13180.feature.rst

@@ -0,0 +1,5 @@
+Exposed autoused fixture names as global variables for tests.
+
+Two caveats:
+- It is still not possible to directly use, for example, `autoused_int_fixture += 1` without a prior `global autoused_int_fixture` statement in test definition.
+- This feature makes the test work on an augmented copy of its `.__globals__` dict. So if the test actually modifies `globals()` (which looks like a terrible idea and is probably discouraged somewhere in pytest docs), it may cause issues.

src/_pytest/python.py

@@ -150,6 +150,10 @@ def pytest_pyfunc_call(pyfuncitem: Function) -> object | None:
         async_fail(pyfuncitem.nodeid)
     funcargs = pyfuncitem.funcargs
     testargs = {arg: funcargs[arg] for arg in pyfuncitem._fixtureinfo.argnames}
+    autoused = {arg: funcargs[arg] for arg in funcargs if arg not in testargs}
+    testfunction = types.FunctionType(
+        testfunction.__code__, testfunction.__globals__ | autoused
+    )
     result = testfunction(**testargs)
     if hasattr(result, "__await__") or hasattr(result, "__aiter__"):
         async_fail(pyfuncitem.nodeid)