feat: add worker HTTP client

tests/test_services.py

@@ -1,6 +1,7 @@
 from src.backend.config import settings
 
 import pytest
+from unittest.mock import AsyncMock, MagicMock, patch
 
 
 def test_settings_loads_api_key():
@@ -109,3 +110,80 @@ def test_envelope_fail():
     result = fail("NOT_FOUND", "Resource not found")
     assert result["success"] is False
     assert result["error"]["code"] == "NOT_FOUND"
+
+
+@pytest.mark.asyncio
+async def test_worker_client_process():
+    from src.backend.services.worker_client import WorkerClient
+
+    mock_response = MagicMock()
+    mock_response.status_code = 200
+    mock_response.json.return_value = {
+        "success": True,
+        "result": "The answer is 42.",
+        "session_id": "sess-123",
+    }
+
+    with patch("src.backend.services.worker_client.httpx.AsyncClient") as MockClient:
+        mock_client_instance = AsyncMock()
+        mock_client_instance.post.return_value = mock_response
+        mock_client_instance.__aenter__ = AsyncMock(return_value=mock_client_instance)
+        mock_client_instance.__aexit__ = AsyncMock(return_value=False)
+        MockClient.return_value = mock_client_instance
+
+        client = WorkerClient()
+        result = await client.process(
+            prompt="What is the answer?",
+            system_prompt="You know everything.",
+            model="claude-sonnet-4-6",
+        )
+
+        assert result["success"] is True
+        assert result["result"] == "The answer is 42."
+
+
+@pytest.mark.asyncio
+async def test_worker_client_summarize():
+    from src.backend.services.worker_client import WorkerClient
+
+    mock_response = MagicMock()
+    mock_response.status_code = 200
+    mock_response.json.return_value = {
+        "success": True,
+        "summary": "[2026-05-25] Discussed the meaning of life.",
+    }
+
+    with patch("src.backend.services.worker_client.httpx.AsyncClient") as MockClient:
+        mock_client_instance = AsyncMock()
+        mock_client_instance.post.return_value = mock_response
+        mock_client_instance.__aenter__ = AsyncMock(return_value=mock_client_instance)
+        mock_client_instance.__aexit__ = AsyncMock(return_value=False)
+        MockClient.return_value = mock_client_instance
+
+        client = WorkerClient()
+        result = await client.summarize(
+            exchanges=[{"prompt": "What?", "result": "42."}],
+            mode="incremental",
+        )
+
+        assert result["success"] is True
+        assert "Discussed" in result["summary"]
+
+
+@pytest.mark.asyncio
+async def test_worker_client_health():
+    from src.backend.services.worker_client import WorkerClient
+
+    mock_response = AsyncMock()
+    mock_response.status_code = 200
+
+    with patch("src.backend.services.worker_client.httpx.AsyncClient") as MockClient:
+        mock_client_instance = AsyncMock()
+        mock_client_instance.get.return_value = mock_response
+        mock_client_instance.__aenter__ = AsyncMock(return_value=mock_client_instance)
+        mock_client_instance.__aexit__ = AsyncMock(return_value=False)
+        MockClient.return_value = mock_client_instance
+
+        client = WorkerClient()
+        is_healthy = await client.health()
+        assert is_healthy is True