tests: Run each test in separate config/cache dirs

Run each CLI command in a separate config/cache dir, to avoid leaks
between tests. Moreover, this way we are able to check the contents of
the config/cache dirs for a single CLI run.

tests/test_cli.py

@@ -129,18 +129,31 @@ def run_cli(
  if os.environ.get("DUMMY_CONVERSION", False):
  args = ("--unsafe-dummy-conversion", *args)
 
- # TODO: Replace this with `contextlib.chdir()` [1], which was added in
- # Python 3.11.
- #
- # [1]: # https://docs.python.org/3/library/contextlib.html#contextlib.chdir
- try:
- if tmp_path is not None:
- cwd = os.getcwd()
- os.chdir(tmp_path)
- result = CliRunner().invoke(cli_main, args)
- finally:
- if tmp_path is not None:
- os.chdir(cwd)
+ with tempfile.TemporaryDirectory() as tmp_dir:
+ # Run each test in a separate config/cache directory.
+ tmp_dir = Path(tmp_dir)
+ config_dir = tmp_dir / "config"
+ cache_dir = tmp_dir / "cache"
+ args = (
+ "--config-dir",
+ str(config_dir),
+ "--cache-dir",
+ str(cache_dir),
+ *args,
+ )
+
+ # TODO: Replace this with `contextlib.chdir()` [1], which was added in
+ # Python 3.11.
+ #
+ # [1]: # https://docs.python.org/3/library/contextlib.html#contextlib.chdir
+ try:
+ if tmp_path is not None:
+ cwd = os.getcwd()
+ os.chdir(tmp_path)
+ result = CliRunner().invoke(cli_main, args)
+ finally:
+ if tmp_path is not None:
+ os.chdir(cwd)
 
  return CLIResult.reclass_click_result(result, args)