test_select_gen: passthru environment variables

black and jinja2 may only be available via VIRTUAL_ENV or PYTHONPATH

Author: pbsds

tests/test_select_gen.py

@@ -1,5 +1,6 @@
 import subprocess
 import sys
+import os
 from pathlib import Path
 
 from .conftest import needs_py39
@@ -9,9 +10,11 @@
 
 @needs_py39
 def test_select_gen() -> None:
+    env = os.environ.copy()
+    env["CHECK_JINJA"] = "1"
     result = subprocess.run(
         [sys.executable, "scripts/generate_select.py"],
-        env={"CHECK_JINJA": "1"},
+        env=env,
         check=True,
         cwd=root_path,
         capture_output=True,