chore: Update unit test case

Author: anubhav756

packages/toolbox-core/tests/test_client.py

@@ -378,15 +378,23 @@ async def test_bind_callable_param_success(self, tool_name, client):
         assert "argA" in res
 
     @pytest.mark.asyncio
-    async def test_bind_param_fail(self, tool_name, client):
-        """Tests 'bind_param' with a bound parameter that doesn't exist."""
+    async def test_bind_param_fail_on_rebind(self, tool_name, client):
+        """
+        Tests that 'bind_parameters' fails when attempting to re-bind a
+        parameter that has already been bound.
+        """
         tool = await client.load_tool(tool_name)
 
         assert len(tool.__signature__.parameters) == 2
         assert "argA" in tool.__signature__.parameters
 
-        with pytest.raises(Exception):
-            tool = tool.bind_parameters({"argC": lambda: 5})
+        bound_tool_once = tool.bind_parameters({"argA": 5})
+        assert "argA" not in bound_tool_once.__signature__.parameters
+        assert "argB" in bound_tool_once.__signature__.parameters
+
+        expected_error_msg = "cannot re-bind parameter: parameter 'argA' is already bound"
+        with pytest.raises(ValueError, match=expected_error_msg):
+            bound_tool_once.bind_parameters({"argA": 10})
 
     @pytest.mark.asyncio
     async def test_bind_param_static_value_success(self, tool_name, client):