Add compat for old pytest in type hints

CHANGELOG.md

@@ -10,6 +10,7 @@
 
 * Improve test coverage by running an HTTP server to fake the Patroni API (#55
   by @dlax).
+* Work around old pytest versions in type annotations in the test suite.
 * Declare compatibility with click version 7.1 (or higher).
 
 ## check_patroni 1.0.0 - 2023-08-28

setup.py

@@ -45,7 +45,8 @@ setup(
     ],
     extras_require={
         "test": [
-            "pytest",
+            "importlib_metadata; python_version < '3.8'",
+            "pytest >= 6.0.2",
         ],
     },
     entry_points={

tests/conftest.py

@@ -1,6 +1,12 @@
+import sys
 from pathlib import Path
 from threading import Thread
-from typing import Any, Iterator
+from typing import Any, Iterator, Tuple
+
+if sys.version_info >= (3, 8):
+    from importlib.metadata import version as metadata_version
+else:
+    from importlib_metadata import version as metadata_version
 
 import pytest
 from click.testing import CliRunner
@@ -8,6 +14,17 @@ from click.testing import CliRunner
 from . import PatroniAPI
 
 
+def numversion(pkgname: str) -> Tuple[int, ...]:
+    version = metadata_version(pkgname)
+    return tuple(int(v) for v in version.split(".", 3))
+
+
+if numversion("pytest") >= (6, 2):
+    TempPathFactory = pytest.TempPathFactory
+else:
+    from _pytest.tmpdir import TempPathFactory
+
+
 @pytest.fixture(
     params=[False, True],
     ids=lambda v: "new-replica-state" if v else "old-replica-state",
@@ -23,7 +40,7 @@ def datadir() -> Path:
 
 @pytest.fixture(scope="session")
 def patroni_api(
-    tmp_path_factory: pytest.TempPathFactory, datadir: Path
+    tmp_path_factory: TempPathFactory, datadir: Path
 ) -> Iterator[PatroniAPI]:
     """A fake HTTP server for the Patroni API serving files from a temporary
     directory.