feat: Add ToolCollection class for named tool access (#339)

This change allows accessing tools by name (tools["tool_name"]) in addition to
index (tools[0]), making it more intuitive and convenient to work with multiple
tools without needing to remember their position in the list

tests/tools/tool_collection_test.py

@@ -0,0 +1,172 @@
+import unittest
+from unittest.mock import MagicMock
+
+from crewai.tools import BaseTool
+from crewai_tools.adapters.tool_collection import ToolCollection
+
+
+class TestToolCollection(unittest.TestCase):
+    def setUp(self):
+
+        self.search_tool = self._create_mock_tool("search", "Search Tool")
+        self.calculator_tool = self._create_mock_tool("calculator", "Calculator Tool")
+        self.translator_tool = self._create_mock_tool("translator", "Translator Tool")
+
+        self.tools = ToolCollection([
+            self.search_tool,
+            self.calculator_tool,
+            self.translator_tool
+        ])
+
+    def _create_mock_tool(self, name, description):
+        mock_tool = MagicMock(spec=BaseTool)
+        mock_tool.name = name
+        mock_tool.description = description
+        return mock_tool
+
+    def test_initialization(self):
+        self.assertEqual(len(self.tools), 3)
+        self.assertEqual(self.tools[0].name, "search")
+        self.assertEqual(self.tools[1].name, "calculator")
+        self.assertEqual(self.tools[2].name, "translator")
+
+    def test_empty_initialization(self):
+        empty_collection = ToolCollection()
+        self.assertEqual(len(empty_collection), 0)
+        self.assertEqual(empty_collection._name_cache, {})
+
+    def test_initialization_with_none(self):
+        collection = ToolCollection(None)
+        self.assertEqual(len(collection), 0)
+        self.assertEqual(collection._name_cache, {})
+
+    def test_access_by_index(self):
+        self.assertEqual(self.tools[0], self.search_tool)
+        self.assertEqual(self.tools[1], self.calculator_tool)
+        self.assertEqual(self.tools[2], self.translator_tool)
+
+    def test_access_by_name(self):
+        self.assertEqual(self.tools["search"], self.search_tool)
+        self.assertEqual(self.tools["calculator"], self.calculator_tool)
+        self.assertEqual(self.tools["translator"], self.translator_tool)
+
+    def test_key_error_for_invalid_name(self):
+        with self.assertRaises(KeyError):
+            _ = self.tools["nonexistent"]
+
+    def test_index_error_for_invalid_index(self):
+        with self.assertRaises(IndexError):
+            _ = self.tools[10]
+
+    def test_negative_index(self):
+        self.assertEqual(self.tools[-1], self.translator_tool)
+        self.assertEqual(self.tools[-2], self.calculator_tool)
+        self.assertEqual(self.tools[-3], self.search_tool)
+
+    def test_append(self):
+        new_tool = self._create_mock_tool("new", "New Tool")
+        self.tools.append(new_tool)
+
+        self.assertEqual(len(self.tools), 4)
+        self.assertEqual(self.tools[3], new_tool)
+        self.assertEqual(self.tools["new"], new_tool)
+        self.assertIn("new", self.tools._name_cache)
+
+    def test_append_duplicate_name(self):
+        duplicate_tool = self._create_mock_tool("search", "Duplicate Search Tool")
+        self.tools.append(duplicate_tool)
+
+        self.assertEqual(len(self.tools), 4)
+        self.assertEqual(self.tools["search"], duplicate_tool)
+
+    def test_extend(self):
+        new_tools = [
+            self._create_mock_tool("tool4", "Tool 4"),
+            self._create_mock_tool("tool5", "Tool 5"),
+        ]
+        self.tools.extend(new_tools)
+
+        self.assertEqual(len(self.tools), 5)
+        self.assertEqual(self.tools["tool4"], new_tools[0])
+        self.assertEqual(self.tools["tool5"], new_tools[1])
+        self.assertIn("tool4", self.tools._name_cache)
+        self.assertIn("tool5", self.tools._name_cache)
+
+    def test_insert(self):
+        new_tool = self._create_mock_tool("inserted", "Inserted Tool")
+        self.tools.insert(1, new_tool)
+
+        self.assertEqual(len(self.tools), 4)
+        self.assertEqual(self.tools[1], new_tool)
+        self.assertEqual(self.tools["inserted"], new_tool)
+        self.assertIn("inserted", self.tools._name_cache)
+
+    def test_remove(self):
+        self.tools.remove(self.calculator_tool)
+
+        self.assertEqual(len(self.tools), 2)
+        with self.assertRaises(KeyError):
+            _ = self.tools["calculator"]
+        self.assertNotIn("calculator", self.tools._name_cache)
+
+    def test_remove_nonexistent_tool(self):
+        nonexistent_tool = self._create_mock_tool("nonexistent", "Nonexistent Tool")
+
+        with self.assertRaises(ValueError):
+            self.tools.remove(nonexistent_tool)
+
+    def test_pop(self):
+        popped = self.tools.pop(1)
+
+        self.assertEqual(popped, self.calculator_tool)
+        self.assertEqual(len(self.tools), 2)
+        with self.assertRaises(KeyError):
+            _ = self.tools["calculator"]
+        self.assertNotIn("calculator", self.tools._name_cache)
+
+    def test_pop_last(self):
+        popped = self.tools.pop()
+
+        self.assertEqual(popped, self.translator_tool)
+        self.assertEqual(len(self.tools), 2)
+        with self.assertRaises(KeyError):
+            _ = self.tools["translator"]
+        self.assertNotIn("translator", self.tools._name_cache)
+
+    def test_clear(self):
+        self.tools.clear()
+
+        self.assertEqual(len(self.tools), 0)
+        self.assertEqual(self.tools._name_cache, {})
+        with self.assertRaises(KeyError):
+            _ = self.tools["search"]
+
+    def test_iteration(self):
+        tools_list = list(self.tools)
+        self.assertEqual(tools_list, [self.search_tool, self.calculator_tool, self.translator_tool])
+
+    def test_contains(self):
+        self.assertIn(self.search_tool, self.tools)
+        self.assertIn(self.calculator_tool, self.tools)
+        self.assertIn(self.translator_tool, self.tools)
+
+        nonexistent_tool = self._create_mock_tool("nonexistent", "Nonexistent Tool")
+        self.assertNotIn(nonexistent_tool, self.tools)
+
+    def test_slicing(self):
+        slice_result = self.tools[1:3]
+        self.assertEqual(len(slice_result), 2)
+        self.assertEqual(slice_result[0], self.calculator_tool)
+        self.assertEqual(slice_result[1], self.translator_tool)
+
+        self.assertIsInstance(slice_result, list)
+        self.assertNotIsInstance(slice_result, ToolCollection)
+
+    def test_getitem_with_tool_name_as_int(self):
+        numeric_name_tool = self._create_mock_tool("123", "Numeric Name Tool")
+        self.tools.append(numeric_name_tool)
+
+        self.assertEqual(self.tools["123"], numeric_name_tool)
+
+        with self.assertRaises(IndexError):
+            _ = self.tools[123]