Revert "legacypath: only add `testdir` and `tmpdir` fixtures if corresponding plugins are registered"

This reverts commit e6eac28f0e.

This approach doesn't work when pytester is loaded thru a conftest
`pytest_plugins`.

Fixes #9280.

doc/en/reference/reference.rst

@@ -638,7 +638,7 @@ tmpdir
 
 :ref:`tmpdir and tmpdir_factory`
 
-.. autofunction:: _pytest.legacypath.LegacyTmpdirPlugin.tmpdir()
+.. autofunction:: _pytest.legacypath.tmpdir()
     :no-auto-options:
 
 

src/_pytest/legacypath.py

@@ -248,17 +248,15 @@ class Testdir:
 pytest.Testdir = Testdir  # type: ignore[attr-defined]
 
 
-class LegacyTestdirPlugin:
+@pytest.fixture
-    @staticmethod
+def testdir(pytester: pytest.Pytester) -> Testdir:
-    @pytest.fixture
+    """
-    def testdir(pytester: pytest.Pytester) -> Testdir:
+    Identical to :fixture:`pytester`, and provides an instance whose methods return
-        """
+    legacy ``LEGACY_PATH`` objects instead when applicable.
-        Identical to :fixture:`pytester`, and provides an instance whose methods return
-        legacy ``LEGACY_PATH`` objects instead when applicable.
 
-        New code should avoid using :fixture:`testdir` in favor of :fixture:`pytester`.
+    New code should avoid using :fixture:`testdir` in favor of :fixture:`pytester`.
-        """
+    """
-        return Testdir(pytester, _ispytest=True)
+    return Testdir(pytester, _ispytest=True)
 
 
 @final
@@ -287,31 +285,29 @@ class TempdirFactory:
 pytest.TempdirFactory = TempdirFactory  # type: ignore[attr-defined]
 
 
-class LegacyTmpdirPlugin:
+@pytest.fixture(scope="session")
-    @staticmethod
+def tmpdir_factory(request: pytest.FixtureRequest) -> TempdirFactory:
-    @pytest.fixture(scope="session")
+    """Return a :class:`pytest.TempdirFactory` instance for the test session."""
-    def tmpdir_factory(request: pytest.FixtureRequest) -> TempdirFactory:
+    # Set dynamically by pytest_configure().
-        """Return a :class:`pytest.TempdirFactory` instance for the test session."""
+    return request.config._tmpdirhandler  # type: ignore
-        # Set dynamically by pytest_configure().
-        return request.config._tmpdirhandler  # type: ignore
 
-    @staticmethod
-    @pytest.fixture
-    def tmpdir(tmp_path: Path) -> LEGACY_PATH:
-        """Return a temporary directory path object which is unique to each test
-        function invocation, created as a sub directory of the base temporary
-        directory.
 
-        By default, a new base temporary directory is created each test session,
+@pytest.fixture
-        and old bases are removed after 3 sessions, to aid in debugging. If
+def tmpdir(tmp_path: Path) -> LEGACY_PATH:
-        ``--basetemp`` is used then it is cleared each session. See :ref:`base
+    """Return a temporary directory path object which is unique to each test
-        temporary directory`.
+    function invocation, created as a sub directory of the base temporary
+    directory.
 
-        The returned object is a `legacy_path`_ object.
+    By default, a new base temporary directory is created each test session,
+    and old bases are removed after 3 sessions, to aid in debugging. If
+    ``--basetemp`` is used then it is cleared each session. See :ref:`base
+    temporary directory`.
 
-        .. _legacy_path: https://py.readthedocs.io/en/latest/path.html
+    The returned object is a `legacy_path`_ object.
-        """
+
-        return legacy_path(tmp_path)
+    .. _legacy_path: https://py.readthedocs.io/en/latest/path.html
+    """
+    return legacy_path(tmp_path)
 
 
 def Cache_makedir(self: pytest.Cache, name: str) -> LEGACY_PATH:
@@ -404,25 +400,19 @@ def pytest_configure(config: pytest.Config) -> None:
     mp = pytest.MonkeyPatch()
     config.add_cleanup(mp.undo)
 
-    if config.pluginmanager.has_plugin("pytester"):
+    # Create TmpdirFactory and attach it to the config object.
-        config.pluginmanager.register(LegacyTestdirPlugin, "legacypath-pytester")
+    #
-
+    # This is to comply with existing plugins which expect the handler to be
-    if config.pluginmanager.has_plugin("tmpdir"):
+    # available at pytest_configure time, but ideally should be moved entirely
-        # Create TmpdirFactory and attach it to the config object.
+    # to the tmpdir_factory session fixture.
-        #
+    try:
-        # This is to comply with existing plugins which expect the handler to be
+        tmp_path_factory = config._tmp_path_factory  # type: ignore[attr-defined]
-        # available at pytest_configure time, but ideally should be moved entirely
+    except AttributeError:
-        # to the tmpdir_factory session fixture.
+        # tmpdir plugin is blocked.
-        try:
+        pass
-            tmp_path_factory = config._tmp_path_factory  # type: ignore[attr-defined]
+    else:
-        except AttributeError:
+        _tmpdirhandler = TempdirFactory(tmp_path_factory, _ispytest=True)
-            # tmpdir plugin is blocked.
+        mp.setattr(config, "_tmpdirhandler", _tmpdirhandler, raising=False)
-            pass
-        else:
-            _tmpdirhandler = TempdirFactory(tmp_path_factory, _ispytest=True)
-            mp.setattr(config, "_tmpdirhandler", _tmpdirhandler, raising=False)
-
-        config.pluginmanager.register(LegacyTmpdirPlugin, "legacypath-tmpdir")
 
     # Add Cache.makedir().
     mp.setattr(pytest.Cache, "makedir", Cache_makedir, raising=False)