Fix #2698: Implement MCP SSE server connection for tools

Co-Authored-By: Joe Moura <joao@crewai.com>

tests/tools/test_mcp_connector.py

@@ -0,0 +1,93 @@
+import json
+import unittest
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+from crewai.tools import BaseTool, Tool
+from crewai.tools.mcp_connector import MCPToolConnector
+
+
+class TestMCPToolConnector(unittest.TestCase):
+    def setUp(self):
+        self.mock_tool = MagicMock(spec=BaseTool)
+        self.mock_tool.name = "test_tool"
+        self.mock_tool.description = "A test tool"
+        self.mock_tool.args_schema = MagicMock()
+        self.mock_tool.args_schema.model_json_schema.return_value = {
+            "properties": {"input": {"type": "string"}}
+        }
+        self.mock_tool.run.return_value = "Tool result"
+        
+        self.connector = MCPToolConnector(tools=[self.mock_tool])
+
+    @patch("crewai.cli.authentication.utils.TokenManager.get_access_token")
+    @patch("crewai.tools.mcp_connector.SSEClient")
+    def test_connect_success(self, mock_sse_client, mock_get_token):
+        mock_get_token.return_value = "test-token"
+        mock_sse = MagicMock()
+        mock_sse_client.return_value = mock_sse
+        
+        self.connector.connect()
+        
+        mock_get_token.assert_called_once()
+        mock_sse_client.assert_called_once_with(
+            base_url="https://app.crewai.com",
+            endpoint="/api/v1/tools/events",
+            headers={
+                "Authorization": "Bearer test-token",
+                "Accept": "text/event-stream",
+                "Cache-Control": "no-cache",
+                "X-Requested-With": "XMLHttpRequest",
+            },
+            timeout=30
+        )
+        mock_sse.connect.assert_called_once()
+
+    @patch("crewai.cli.authentication.utils.TokenManager.get_access_token")
+    def test_connect_no_token(self, mock_get_token):
+        mock_get_token.return_value = None
+        
+        with pytest.raises(ValueError, match="Authentication token not found"):
+            self.connector.connect()
+
+    @patch("crewai.cli.authentication.utils.TokenManager.get_access_token")
+    @patch("crewai.tools.mcp_connector.SSEClient")
+    def test_listen(self, mock_sse_client, mock_get_token):
+        mock_get_token.return_value = "test-token"
+        mock_sse = MagicMock()
+        mock_sse_client.return_value = mock_sse
+        
+        self.connector._sse_client = mock_sse
+        self.connector.listen()
+        
+        mock_sse.listen.assert_called_once()
+        handlers = mock_sse.listen.call_args[0][0]
+        assert "tool_request" in handlers
+        assert "connection_closed" in handlers
+
+    @patch("crewai.cli.authentication.utils.TokenManager.get_access_token")
+    @patch("crewai.tools.mcp_connector.SSEClient")
+    def test_handle_tool_request(self, mock_sse_client, mock_get_token):
+        mock_get_token.return_value = "test-token"
+        
+        test_data = {
+            "tool_name": "test_tool",
+            "arguments": {"input": "test input"},
+            "request_id": "123"
+        }
+        
+        self.connector._handle_tool_request(test_data)
+        
+        self.mock_tool.run.assert_called_once_with(input="test input")
+
+    def test_handle_tool_request_not_found(self):
+        test_data = {
+            "tool_name": "non_existent_tool",
+            "arguments": {"input": "test input"},
+            "request_id": "123"
+        }
+        
+        self.connector._handle_tool_request(test_data)
+        
+        self.mock_tool.run.assert_not_called()