test: output test_clumpstep_summary_stats results to temp dir

tests/step/test_clump_step.py

@@ -1,6 +1,8 @@
 """Test clump step."""
 from __future__ import annotations
 
+import tempfile
+from pathlib import Path
 from typing import TYPE_CHECKING
 
 from otg.clump import ClumpStep
@@ -12,13 +14,13 @@
 class TestClumpStep:
     """Test clump step."""
 
-    def test_clumpstep_summary_stats(
-        self: TestClumpStep,
-        session: Session,
-    ) -> None:
-        """Test clump step on summary statistics."""
-        ClumpStep(
-            session=session,
-            input_path="tests/data_samples/GCST005523_chr18.parquet",
-            clumped_study_locus_path="GCST005523_chr18_clumped",
-        )
+    def test_clumpstep_summary_stats(self, session: Session) -> None:
+        """Test clump step on summary statistics writes results to a temporary directory."""
+        with tempfile.TemporaryDirectory() as temp_dir:
+            clumped_study_locus_path = Path(temp_dir, "GCST005523_chr18_clumped")
+            ClumpStep(
+                session=session,
+                input_path="tests/data_samples/GCST005523_chr18.parquet",
+                clumped_study_locus_path=str(clumped_study_locus_path),
+            )
+            assert Path(clumped_study_locus_path).exists(), "Output directory exists."