make yielded tests participate in the autouse protocol

CHANGELOG

@@ -1,6 +1,7 @@
 Changes between 2.3.3 and 2.3.4.dev
 -----------------------------------
 
+- yielded tests will activate autouse-fixtures
 - NOTE: the pre-2.0 way of yielding tests is not compatible
   with autouse fixtures.  If you need generative tests, use
   @pytest.mark.parametrize or pytest_generate_tests, see the

_pytest/python.py

@@ -528,7 +528,7 @@ def hasinit(obj):
 
 def fillfixtures(function):
     """ fill missing funcargs for a test function. """
-    if getattr(function, "_args", None) is None:  # not a yielded function
+    if 1 or getattr(function, "_args", None) is None:  # not a yielded function
         try:
             request = function._request
         except AttributeError:
@@ -906,12 +906,15 @@ class Function(FunctionMixin, pytest.Item, FuncargnamesCompatAttr):
                 self.keywords[name] = val
 
         fm = self.session._fixturemanager
-        self._fixtureinfo = fi = fm.getfixtureinfo(self.parent,
-                                                   self.obj, self.cls)
+        isyield = self._isyieldedfunction()
+        self._fixtureinfo = fi = fm.getfixtureinfo(self.parent, self.obj,
+                                                   self.cls,
+                                                   funcargs=not isyield)
         self.fixturenames = fi.names_closure
-        if self._isyieldedfunction():
+        if isyield:
             assert not callspec, (
                 "yielded functions (deprecated) cannot have funcargs")
+            self.funcargs = {}
         else:
             if callspec is not None:
                 self.callspec = callspec
@@ -922,7 +925,6 @@ class Function(FunctionMixin, pytest.Item, FuncargnamesCompatAttr):
             else:
                 self.funcargs = {}
         self._request = req = FixtureRequest(self)
-            #req._discoverfactories()
 
     @property
     def function(self):
@@ -1398,13 +1400,13 @@ class FixtureManager:
 
         self._nodename2fixtureinfo = {}
 
-    def getfixtureinfo(self, node, func, cls):
+    def getfixtureinfo(self, node, func, cls, funcargs=True):
         key = (node, func.__name__)
         try:
             return self._nodename2fixtureinfo[key]
         except KeyError:
             pass
-        if not hasattr(node, "nofuncargs"):
+        if funcargs and not hasattr(node, "nofuncargs"):
             if cls is not None:
                 startindex = 1
             else:

testing/python/fixture.py

@@ -968,6 +968,24 @@ class TestAutouseManagement:
         reprec = testdir.inline_run("-s")
         reprec.assertoutcome(passed=1)
 
+    def test_autouse_honored_for_yield(self, testdir):
+        testdir.makepyfile("""
+            import pytest
+            @pytest.fixture(autouse=True)
+            def tst():
+                global x
+                x = 3
+            def test_gen():
+                def f(hello):
+                    assert x == abs(hello)
+                yield f, 3
+                yield f, -3
+        """)
+        reprec = testdir.inline_run()
+        reprec.assertoutcome(passed=2)
+
+
+
     def test_funcarg_and_setup(self, testdir):
         testdir.makepyfile("""
             import pytest