Use nodeid instead of name to identify test

This fixes a race condition caused by multiple tests with the same
name in different files using the same cache directory

Author: PGijsbers

tests/conftest.py

@@ -291,7 +291,7 @@ def with_test_cache(test_files_directory, request):
             f"Cannot find test cache dir, expected it to be {test_files_directory!s}!",
         )
     _root_cache_directory = openml.config._root_cache_directory
-    tmp_cache = test_files_directory / request.node.name
+    tmp_cache = test_files_directory / request.node.nodeid.replace("/", ".").replace("::", ".")
     openml.config.set_root_cache_directory(tmp_cache)
     yield
     openml.config.set_root_cache_directory(_root_cache_directory)
@@ -308,4 +308,4 @@ def workdir(tmp_path):
     original_cwd = Path.cwd()
     os.chdir(tmp_path)
     yield tmp_path
-    os.chdir(original_cwd)
+    os.chdir(original_cwd)