fix: py3.8 compatibility

tests/resources/__init__.py

@@ -0,0 +1,16 @@
+import importlib.resources
+import sys
+
+
+def get_resource(path: str):
+    """
+    A wrapper for `importlib.resources.files()` since it's not available in Python 3.8.
+    """
+    if sys.version_info >= (3, 9, 0):
+        with importlib.resources.as_file(
+            importlib.resources.files(__name__).joinpath(path)
+        ) as resource_path:
+            return resource_path
+
+    with importlib.resources.path(__name__, path) as resource_path:
+        return resource_path