infra: Fix test filesystem paths incompatible with windows (#14388)

- **Description:** This PR fixes test failures on Windows caused by path
handling differences and unescaped special characters in regex. The
failing tests are:
```
FAILED tests/unit_tests/storage/test_filesystem.py::test_yield_keys - AssertionError: assert ['key1', 'subdir\\key2'] == ['key1', 'subdir/key2']
FAILED tests/unit_tests/test_imports.py::test_importable_all - ModuleNotFoundError: No module named 'langchain_community.langchain_community\\adapters'
FAILED tests/unit_tests/tools/file_management/test_utils.py::test_get_validated_relative_path_errs_on_absolute - re.error: incomplete escape \U at position 53
FAILED tests/unit_tests/tools/file_management/test_utils.py::test_get_validated_relative_path_errs_on_parent_dir - re.error: incomplete escape \U at position 69
FAILED tests/unit_tests/tools/file_management/test_utils.py::test_get_validated_relative_path_errs_for_symlink_outside_root - re.error: incomplete escape \U at position 64
```

- **Issue:** fixes
https://github.com/langchain-ai/langchain/issues/11775 (partially)
- **Dependencies:** none

libs/community/tests/unit_tests/test_imports.py

@@ -1,10 +1,11 @@
 import glob
 import importlib
+from pathlib import Path
 
 
 def test_importable_all() -> None:
     for path in glob.glob("../community/langchain_community/*"):
-        relative_path = path.split("/")[-1]
+        relative_path = Path(path).parts[-1]
         if relative_path.endswith(".typed"):
             continue
         module_name = relative_path.split(".")[0]

libs/community/tests/unit_tests/tools/file_management/test_utils.py

@@ -1,6 +1,6 @@
 """Test the File Management utils."""
 
-
+import re
 from pathlib import Path
 from tempfile import TemporaryDirectory
 
@@ -16,8 +16,8 @@ def test_get_validated_relative_path_errs_on_absolute() -> None:
     """Safely resolve a path."""
     root = Path(__file__).parent
     user_path = "/bin/bash"
-    matches = f"Path {user_path} is outside of the allowed directory {root}"
-    with pytest.raises(FileValidationError, match=matches):
+    match = re.escape(f"Path {user_path} is outside of the allowed directory {root}")
+    with pytest.raises(FileValidationError, match=match):
         get_validated_relative_path(root, user_path)
 
 
@@ -25,8 +25,8 @@ def test_get_validated_relative_path_errs_on_parent_dir() -> None:
     """Safely resolve a path."""
     root = Path(__file__).parent
     user_path = "data/sub/../../../sibling"
-    matches = f"Path {user_path} is outside of the allowed directory {root}"
-    with pytest.raises(FileValidationError, match=matches):
+    match = re.escape(f"Path {user_path} is outside of the allowed directory {root}")
+    with pytest.raises(FileValidationError, match=match):
         get_validated_relative_path(root, user_path)
 
 
@@ -49,10 +49,10 @@ def test_get_validated_relative_path_errs_for_symlink_outside_root() -> None:
         symlink_path = root / user_path
         symlink_path.symlink_to(outside_path)
 
-        matches = (
+        match = re.escape(
             f"Path {user_path} is outside of the allowed directory {root.resolve()}"
         )
-        with pytest.raises(FileValidationError, match=matches):
+        with pytest.raises(FileValidationError, match=match):
             get_validated_relative_path(root, user_path)
 
         symlink_path.unlink()

libs/core/tests/unit_tests/test_imports.py

@@ -1,10 +1,11 @@
 import glob
 import importlib
+from pathlib import Path
 
 
 def test_importable_all() -> None:
     for path in glob.glob("../core/langchain_core/*"):
-        relative_path = path.split("/")[-1]
+        relative_path = Path(path).parts[-1]
         if relative_path.endswith(".typed"):
             continue
         module_name = relative_path.split(".")[0]

libs/experimental/tests/unit_tests/test_imports.py

@@ -1,10 +1,11 @@
 import glob
 import importlib
+from pathlib import Path
 
 
 def test_importable_all() -> None:
     for path in glob.glob("../experimental/langchain_experimental/*"):
-        relative_path = path.split("/")[-1]
+        relative_path = Path(path).parts[-1]
         if relative_path.endswith(".typed"):
             continue
         module_name = relative_path.split(".")[0]

libs/langchain/tests/unit_tests/storage/test_filesystem.py

@@ -1,3 +1,4 @@
+import os
 import tempfile
 from typing import Generator
 
@@ -74,5 +75,5 @@ def test_yield_keys(file_store: LocalFileStore) -> None:
     keys = list(file_store.yield_keys())
 
     # Assert that the yielded keys match the expected keys
-    expected_keys = ["key1", "subdir/key2"]
+    expected_keys = ["key1", os.path.join("subdir", "key2")]
     assert keys == expected_keys

libs/langchain/tests/unit_tests/test_imports.py

@@ -1,10 +1,11 @@
 import glob
 import importlib
+from pathlib import Path
 
 
 def test_importable_all() -> None:
     for path in glob.glob("../langchain/langchain/*"):
-        relative_path = path.split("/")[-1]
+        relative_path = Path(path).parts[-1]
         if relative_path.endswith(".typed"):
             continue
         module_name = relative_path.split(".")[0]