add back user_filesystem fixture

Author: cadenmyers13

tests/conftest.py

@@ -1,12 +1,28 @@
 import importlib.resources
+import json
 import logging
 from functools import lru_cache
+from pathlib import Path
 
 import pytest
 
 logger = logging.getLogger(__name__)
 
 
+@pytest.fixture
+def user_filesystem(tmp_path):
+    base_dir = Path(tmp_path)
+    home_dir = base_dir / "home_dir"
+    home_dir.mkdir(parents=True, exist_ok=True)
+    cwd_dir = base_dir / "cwd_dir"
+    cwd_dir.mkdir(parents=True, exist_ok=True)
+
+    home_config_data = {"username": "home_username", "email": "[email protected]"}
+    with open(home_dir / "diffpyconfig.json", "w") as f:
+        json.dump(home_config_data, f)
+    yield tmp_path
+
+
 # diffpy.structure
 @lru_cache()
 def has_diffpy_structure():