refactor: Use importlib.resources instead of __file__ to retrieve…

… sample Singer output files (#1877)

singer_sdk/helpers/_compat.py

@@ -11,4 +11,9 @@
     from importlib import metadata
     from typing import final  # noqa: ICN003
 
-__all__ = ["metadata", "final"]
+if sys.version_info < (3, 9):
+    import importlib_resources as resources
+else:
+    from importlib import resources
+
+__all__ = ["metadata", "final", "resources"]

singer_sdk/testing/target_test_streams/__init__.py

@@ -0,0 +1 @@
+"""Singer output samples, used for testing target behavior."""

singer_sdk/testing/templates.py

@@ -7,6 +7,9 @@
 import warnings
 from pathlib import Path
 
+from singer_sdk.helpers._compat import resources
+from singer_sdk.testing import target_test_streams
+
 if t.TYPE_CHECKING:
     from singer_sdk.streams import Stream
 
@@ -334,5 +337,4 @@ def singer_filepath(self) -> Path:
         Returns:
             The expected Path to this tests singer file.
         """
-        current_dir = Path(__file__).resolve().parent
-        return current_dir / "target_test_streams" / f"{self.name}.singer"
+        return resources.files(target_test_streams).joinpath(f"{self.name}.singer")  # type: ignore[no-any-return]  # noqa: E501