experimental[patch]: Fix import test (#24672)

Import test was misconfigured, the glob wasn't returning any file paths

libs/experimental/tests/unit_tests/test_imports.py

@@ -1,15 +1,46 @@
-import glob
 import importlib
 from pathlib import Path
 
+PKG_ROOT = Path(__file__).parent.parent.parent
+PKG_CODE = PKG_ROOT / "langchain_experimental"
+
 
 def test_importable_all() -> None:
-    for path in glob.glob("../experimental/langchain_experimental/*"):
-        relative_path = Path(path).parts[-1]
+    """Test that all modules in langchain_experimental are importable."""
+    failures = []
+    found_at_least_one = False
+    for path in PKG_CODE.rglob("*.py"):
+        relative_path = str(Path(path).relative_to(PKG_CODE)).replace("/", ".")
         if relative_path.endswith(".typed"):
             continue
-        module_name = relative_path.split(".")[0]
-        module = importlib.import_module("langchain_experimental." + module_name)
+        if relative_path.endswith("/__init__.py"):
+            # Then strip __init__.py
+            s = "/__init__.py"
+            module_name = relative_path[: -len(s)]
+        else:  # just strip .py
+            module_name = relative_path[:-3]
+
+        if not module_name:
+            continue
+        try:
+            module = importlib.import_module("langchain_experimental." + module_name)
+        except ImportError:
+            failures.append("langchain_experimental." + module_name)
+            continue
+
         all_ = getattr(module, "__all__", [])
         for cls_ in all_:
-            getattr(module, cls_)
+            try:
+                getattr(module, cls_)
+            except AttributeError:
+                failures.append(f"{module_name}.{cls_}")
+
+        found_at_least_one = True
+
+    if failures:
+        raise AssertionError(
+            "The following modules or classes could not be imported: "
+            + ", ".join(failures)
+        )
+
+    assert found_at_least_one is True