Support pytest 7 by fixing broken imports (GH-2705)

The tmp_path related changes are not necessary to make pytest 7 work,
but it feels more complete this way.

tests/optional.py

@@ -21,7 +21,12 @@
 from typing import FrozenSet, List, Set, TYPE_CHECKING
 
 import pytest
-from _pytest.store import StoreKey
+
+try:
+    from pytest import StashKey
+except ImportError:
+    # pytest < 7
+    from _pytest.store import StoreKey as StashKey
 
 log = logging.getLogger(__name__)
 
@@ -33,8 +38,8 @@
     from _pytest.nodes import Node
 
 
-ALL_POSSIBLE_OPTIONAL_MARKERS = StoreKey[FrozenSet[str]]()
-ENABLED_OPTIONAL_MARKERS = StoreKey[FrozenSet[str]]()
+ALL_POSSIBLE_OPTIONAL_MARKERS = StashKey[FrozenSet[str]]()
+ENABLED_OPTIONAL_MARKERS = StashKey[FrozenSet[str]]()
 
 
 def pytest_addoption(parser: "Parser") -> None:

tests/test_ipynb.py

@@ -1,3 +1,4 @@
+import pathlib
 import re
 
 from click.testing import CliRunner
@@ -12,7 +13,6 @@
 import pytest
 from black import Mode
 from _pytest.monkeypatch import MonkeyPatch
-from py.path import local
 from tests.util import DATA_DIR
 
 pytestmark = pytest.mark.jupyter
@@ -371,52 +371,52 @@ def test_ipynb_diff_with_no_change() -> None:
 
 
 def test_cache_isnt_written_if_no_jupyter_deps_single(
-    monkeypatch: MonkeyPatch, tmpdir: local
+    monkeypatch: MonkeyPatch, tmp_path: pathlib.Path
 ) -> None:
     # Check that the cache isn't written to if Jupyter dependencies aren't installed.
     jupyter_dependencies_are_installed.cache_clear()
     nb = DATA_DIR / "notebook_trailing_newline.ipynb"
-    tmp_nb = tmpdir / "notebook.ipynb"
+    tmp_nb = tmp_path / "notebook.ipynb"
     with open(nb) as src, open(tmp_nb, "w") as dst:
         dst.write(src.read())
     monkeypatch.setattr(
         "black.jupyter_dependencies_are_installed", lambda verbose, quiet: False
     )
-    result = runner.invoke(main, [str(tmpdir / "notebook.ipynb")])
+    result = runner.invoke(main, [str(tmp_path / "notebook.ipynb")])
     assert "No Python files are present to be formatted. Nothing to do" in result.output
     jupyter_dependencies_are_installed.cache_clear()
     monkeypatch.setattr(
         "black.jupyter_dependencies_are_installed", lambda verbose, quiet: True
     )
-    result = runner.invoke(main, [str(tmpdir / "notebook.ipynb")])
+    result = runner.invoke(main, [str(tmp_path / "notebook.ipynb")])
     assert "reformatted" in result.output
 
 
 def test_cache_isnt_written_if_no_jupyter_deps_dir(
-    monkeypatch: MonkeyPatch, tmpdir: local
+    monkeypatch: MonkeyPatch, tmp_path: pathlib.Path
 ) -> None:
     # Check that the cache isn't written to if Jupyter dependencies aren't installed.
     jupyter_dependencies_are_installed.cache_clear()
     nb = DATA_DIR / "notebook_trailing_newline.ipynb"
-    tmp_nb = tmpdir / "notebook.ipynb"
+    tmp_nb = tmp_path / "notebook.ipynb"
     with open(nb) as src, open(tmp_nb, "w") as dst:
         dst.write(src.read())
     monkeypatch.setattr(
         "black.files.jupyter_dependencies_are_installed", lambda verbose, quiet: False
     )
-    result = runner.invoke(main, [str(tmpdir)])
+    result = runner.invoke(main, [str(tmp_path)])
     assert "No Python files are present to be formatted. Nothing to do" in result.output
     jupyter_dependencies_are_installed.cache_clear()
     monkeypatch.setattr(
         "black.files.jupyter_dependencies_are_installed", lambda verbose, quiet: True
     )
-    result = runner.invoke(main, [str(tmpdir)])
+    result = runner.invoke(main, [str(tmp_path)])
     assert "reformatted" in result.output
 
 
-def test_ipynb_flag(tmpdir: local) -> None:
+def test_ipynb_flag(tmp_path: pathlib.Path) -> None:
     nb = DATA_DIR / "notebook_trailing_newline.ipynb"
-    tmp_nb = tmpdir / "notebook.a_file_extension_which_is_definitely_not_ipynb"
+    tmp_nb = tmp_path / "notebook.a_file_extension_which_is_definitely_not_ipynb"
     with open(nb) as src, open(tmp_nb, "w") as dst:
         dst.write(src.read())
     result = runner.invoke(

tests/test_no_ipynb.py

@@ -1,10 +1,10 @@
 import pytest
 import os
+import pathlib
 
 from tests.util import THIS_DIR
 from black import main, jupyter_dependencies_are_installed
 from click.testing import CliRunner
-from _pytest.tmpdir import tmpdir
 
 pytestmark = pytest.mark.no_jupyter
 
@@ -22,14 +22,14 @@ def test_ipynb_diff_with_no_change_single() -> None:
     assert expected_output in result.output
 
 
-def test_ipynb_diff_with_no_change_dir(tmpdir: tmpdir) -> None:
+def test_ipynb_diff_with_no_change_dir(tmp_path: pathlib.Path) -> None:
     jupyter_dependencies_are_installed.cache_clear()
     runner = CliRunner()
     nb = os.path.join("tests", "data", "notebook_trailing_newline.ipynb")
-    tmp_nb = tmpdir / "notebook.ipynb"
+    tmp_nb = tmp_path / "notebook.ipynb"
     with open(nb) as src, open(tmp_nb, "w") as dst:
         dst.write(src.read())
-    result = runner.invoke(main, [str(tmpdir)])
+    result = runner.invoke(main, [str(tmp_path)])
     expected_output = (
         "Skipping .ipynb files as Jupyter dependencies are not installed.\n"
         "You can fix this by running ``pip install black[jupyter]``\n"