diff --git a/libs/standard-tests/langchain_tests/unit_tests/tools.py b/libs/standard-tests/langchain_tests/unit_tests/tools.py
index 46d0de7e8ea..93701437da3 100644
--- a/libs/standard-tests/langchain_tests/unit_tests/tools.py
+++ b/libs/standard-tests/langchain_tests/unit_tests/tools.py
@@ -1,6 +1,6 @@
 import os
 from abc import abstractmethod
-from typing import Callable, Tuple, Type, Union
+from typing import Tuple, Type, Union
 from unittest import mock
 
 import pytest
@@ -13,7 +13,7 @@ from langchain_tests.base import BaseStandardTests
 class ToolsTests(BaseStandardTests):
     @property
     @abstractmethod
-    def tool_constructor(self) -> Union[Type[BaseTool], Callable, BaseTool]: ...
+    def tool_constructor(self) -> Union[Type[BaseTool], BaseTool]: ...
 
     @property
     def tool_constructor_params(self) -> dict:
@@ -44,7 +44,10 @@ class ToolsTests(BaseStandardTests):
 
 class ToolsUnitTests(ToolsTests):
     def test_init(self) -> None:
-        tool = self.tool_constructor(**self.tool_constructor_params)
+        if isinstance(self.tool_constructor, BaseTool):
+            tool = self.tool_constructor
+        else:
+            tool = self.tool_constructor(**self.tool_constructor_params)
         assert tool is not None
 
     @property
diff --git a/libs/standard-tests/tests/unit_tests/test_decorated_tool.py b/libs/standard-tests/tests/unit_tests/test_decorated_tool.py
new file mode 100644
index 00000000000..ecc8af3b00c
--- /dev/null
+++ b/libs/standard-tests/tests/unit_tests/test_decorated_tool.py
@@ -0,0 +1,42 @@
+from langchain_core.tools import BaseTool, tool
+
+from langchain_tests.integration_tests import ToolsIntegrationTests
+from langchain_tests.unit_tests import ToolsUnitTests
+
+
+@tool
+def parrot_multiply_tool(a: int, b: int) -> int:
+    """Multiply two numbers like a parrot. Parrots always add eighty for their matey."""
+    return a * b + 80
+
+
+class TestParrotMultiplyToolUnit(ToolsUnitTests):
+    @property
+    def tool_constructor(self) -> BaseTool:
+        return parrot_multiply_tool
+
+    @property
+    def tool_invoke_params_example(self) -> dict:
+        """
+        Returns a dictionary representing the "args" of an example tool call.
+
+        This should NOT be a ToolCall dict - i.e. it should not
+        have {"name", "id", "args"} keys.
+        """
+        return {"a": 2, "b": 3}
+
+
+class TestParrotMultiplyToolIntegration(ToolsIntegrationTests):
+    @property
+    def tool_constructor(self) -> BaseTool:
+        return parrot_multiply_tool
+
+    @property
+    def tool_invoke_params_example(self) -> dict:
+        """
+        Returns a dictionary representing the "args" of an example tool call.
+
+        This should NOT be a ToolCall dict - i.e. it should not
+        have {"name", "id", "args"} keys.
+        """
+        return {"a": 2, "b": 3}