fixed pytests

Author: TingwenZhang

tests/conftest.py

@@ -17,3 +17,13 @@ def user_filesystem(tmp_path):
         json.dump(home_config_data, f)
 
     yield tmp_path
+
+
+@pytest.fixture
+def datafile():
+    """Fixture to dynamically load any test file."""
+
+    def _load(filename):
+        return "tests/testdata/" + filename
+
+    return _load

tests/test_version.py

@@ -1,6 +1,6 @@
 """Unit tests for __version__.py."""
 
-import diffpy.structure  # noqa
+import diffpy.structure
 
 
 def test_package_version():