chore: use if TYPE_CHECKING: blocks (#2866)

test/test_environment.py

@@ -1,13 +1,18 @@
+from __future__ import annotations
+
 import os
 import subprocess
 import sys
 import textwrap
-from pathlib import Path
 
 import pytest
 
 from . import test_projects, utils
 
+TYPE_CHECKING = False
+if TYPE_CHECKING:
+    from pathlib import Path
+
 project_with_environment_asserts = test_projects.new_c_project(
     setup_py_add=textwrap.dedent(
         r"""