Test suite executed from CI pipeline (#433)

* Test strategy & test cases

* Unit tests

* Integration tests

tests/unit/test_gateway/test_endpoint_constant.py

@@ -0,0 +1,55 @@
+"""
+Tests for Gateway Constant Endpoint
+"""
+
+import pytest
+from unittest.mock import MagicMock, AsyncMock
+from aiohttp import web
+
+from trustgraph.gateway.endpoint.constant_endpoint import ConstantEndpoint
+
+
+class TestConstantEndpoint:
+    """Test cases for ConstantEndpoint class"""
+
+    def test_constant_endpoint_initialization(self):
+        """Test ConstantEndpoint initialization"""
+        mock_auth = MagicMock()
+        mock_dispatcher = MagicMock()
+        
+        endpoint = ConstantEndpoint(
+            endpoint_path="/api/test",
+            auth=mock_auth,
+            dispatcher=mock_dispatcher
+        )
+        
+        assert endpoint.path == "/api/test"
+        assert endpoint.auth == mock_auth
+        assert endpoint.dispatcher == mock_dispatcher
+        assert endpoint.operation == "service"
+
+    @pytest.mark.asyncio
+    async def test_constant_endpoint_start_method(self):
+        """Test ConstantEndpoint start method (should be no-op)"""
+        mock_auth = MagicMock()
+        mock_dispatcher = MagicMock()
+        
+        endpoint = ConstantEndpoint("/api/test", mock_auth, mock_dispatcher)
+        
+        # start() should complete without error
+        await endpoint.start()
+
+    def test_add_routes_registers_post_handler(self):
+        """Test add_routes method registers POST route"""
+        mock_auth = MagicMock()
+        mock_dispatcher = MagicMock()
+        mock_app = MagicMock()
+        
+        endpoint = ConstantEndpoint("/api/test", mock_auth, mock_dispatcher)
+        endpoint.add_routes(mock_app)
+        
+        # Verify add_routes was called with POST route
+        mock_app.add_routes.assert_called_once()
+        # The call should include web.post with the path and handler
+        call_args = mock_app.add_routes.call_args[0][0]
+        assert len(call_args) == 1  # One route added