runner: express SetupState.teardown_all() in terms of teardown_exact() and remove it

Makes it easier to understand with fewer methods.

src/_pytest/runner.py

@@ -105,7 +105,7 @@ def pytest_sessionstart(session: "Session") -> None:
 
 
 def pytest_sessionfinish(session: "Session") -> None:
-    session._setupstate.teardown_all()
+    session._setupstate.teardown_exact(None)
 
 
 def pytest_runtest_protocol(item: Item, nextitem: Optional[Item]) -> bool:
@@ -177,7 +177,7 @@ def pytest_runtest_call(item: Item) -> None:
 
 def pytest_runtest_teardown(item: Item, nextitem: Optional[Item]) -> None:
     _update_current_test_var(item, "teardown")
-    item.session._setupstate.teardown_exact(item, nextitem)
+    item.session._setupstate.teardown_exact(nextitem)
     _update_current_test_var(item, None)
 
 
@@ -455,7 +455,7 @@ class SetupState:
         for colitem in self._finalizers:
             assert colitem in self.stack
 
-    def teardown_exact(self, item: Item, nextitem: Optional[Item]) -> None:
+    def teardown_exact(self, nextitem: Optional[Item]) -> None:
         needed_collectors = nextitem and nextitem.listchain() or []
         exc = None
         while self.stack:
@@ -470,11 +470,8 @@ class SetupState:
                     exc = e
         if exc:
             raise exc
-
-    def teardown_all(self) -> None:
-        while self.stack:
-            self._pop_and_teardown()
-        assert not self._finalizers
+        if nextitem is None:
+            assert not self._finalizers
 
 
 def collect_one_node(collector: Collector) -> CollectReport:

testing/python/fixtures.py

@@ -856,7 +856,7 @@ class TestRequestBasic:
         teardownlist = parent.obj.teardownlist
         ss = item.session._setupstate
         assert not teardownlist
-        ss.teardown_exact(item, None)
+        ss.teardown_exact(None)
         print(ss.stack)
         assert teardownlist == [1]
 

testing/test_runner.py

@@ -34,9 +34,10 @@ class TestSetupState:
     def test_teardown_exact_stack_empty(self, pytester: Pytester) -> None:
         item = pytester.getitem("def test_func(): pass")
         ss = runner.SetupState()
-        ss.teardown_exact(item, None)
-        ss.teardown_exact(item, None)
-        ss.teardown_exact(item, None)
+        ss.prepare(item)
+        ss.teardown_exact(None)
+        ss.teardown_exact(None)
+        ss.teardown_exact(None)
 
     def test_setup_fails_and_failure_is_cached(self, pytester: Pytester) -> None:
         item = pytester.getitem(
@@ -69,7 +70,7 @@ class TestSetupState:
         ss.addfinalizer(fin2, item)
         ss.addfinalizer(fin3, item)
         with pytest.raises(Exception) as err:
-            ss.teardown_exact(item, None)
+            ss.teardown_exact(None)
         assert err.value.args == ("oops",)
         assert r == ["fin3", "fin1"]
 
@@ -88,7 +89,7 @@ class TestSetupState:
         ss.addfinalizer(fin1, item)
         ss.addfinalizer(fin2, item)
         with pytest.raises(Exception) as err:
-            ss.teardown_exact(item, None)
+            ss.teardown_exact(None)
         assert err.value.args == ("oops2",)
 
     def test_teardown_multiple_scopes_one_fails(self, pytester: Pytester) -> None:
@@ -106,7 +107,7 @@ class TestSetupState:
         ss.addfinalizer(fin_func, item)
         ss.prepare(item)
         with pytest.raises(Exception, match="oops1"):
-            ss.teardown_exact(item, None)
+            ss.teardown_exact(None)
         assert module_teardown