[MNT] Fix race condition in OpenMLSplit tests during parallel execution #1641

tests/test_tasks/test_split.py

@@ -1,13 +1,15 @@
 # License: BSD 3-Clause
 from __future__ import annotations
 
+import contextlib
 import inspect
 import os
 import shutil
 import tempfile
 from pathlib import Path
 
 import numpy as np
+import pytest
 
 from openml import OpenMLSplit
 from openml.testing import TestBase
@@ -18,8 +20,11 @@ class OpenMLSplitTest(TestBase):
     # than 5 seconds + rebuilding the test would potentially be costly
 
     def setUp(self):
+        super().setUp()
+        self._temp_dir = tempfile.TemporaryDirectory()
         __file__ = inspect.getfile(OpenMLSplitTest)
         self.directory = os.path.dirname(__file__)
+        # This is for dataset
         source_arff = (
             Path(self.directory).parent
             / "files"
@@ -30,23 +35,16 @@ def setUp(self):
             / "1882"
             / "datasplits.arff"
         )
-        # Use a unique temp directory for each test to avoid race conditions
-        # when running tests in parallel (see issue #1641)
-        self._temp_dir = tempfile.TemporaryDirectory()
         self.arff_filepath = Path(self._temp_dir.name) / "datasplits.arff"
         shutil.copy(source_arff, self.arff_filepath)
         self.pd_filename = self.arff_filepath.with_suffix(".pkl.py3")
 
     def tearDown(self):
-        # Clean up the entire temp directory
-        try:
-            self._temp_dir.cleanup()
-        except (OSError, FileNotFoundError):
-            pass
+        self._temp_dir.cleanup()
 
     def test_eq(self):
         split = OpenMLSplit._from_arff_file(self.arff_filepath)
-        assert split == split
+        assert split == split  # noqa: PLR0124
 
         split2 = OpenMLSplit._from_arff_file(self.arff_filepath)
         split2.name = "a"
@@ -88,17 +86,7 @@ def test_get_split(self):
         train_split, test_split = split.get(fold=5, repeat=2)
         assert train_split.shape[0] == 808
         assert test_split.shape[0] == 90
-        self.assertRaisesRegex(
-            ValueError,
-            "Repeat 10 not known",
-            split.get,
-            10,
-            2,
-        )
-        self.assertRaisesRegex(
-            ValueError,
-            "Fold 10 not known",
-            split.get,
-            2,
-            10,
-        )
+        with pytest.raises(ValueError, match="Repeat 10 not known"):
+            split.get(10, 2)
+        with pytest.raises(ValueError, match="Fold 10 not known"):
+            split.get(2, 10)