test: increased cb test coverage

test/unit/api/v1/endpoints/test_logs_endpoint.py

@@ -0,0 +1,63 @@
+from unittest.mock import patch
+
+import pytest
+from fastapi import FastAPI
+from fastapi.testclient import TestClient
+from starlette.responses import StreamingResponse
+
+from control_backend.api.v1.endpoints import logs
+
+
+@pytest.fixture
+def client():
+    """TestClient with logs router included."""
+    app = FastAPI()
+    app.include_router(logs.router)
+    return TestClient(app)
+
+
+@pytest.mark.asyncio
+async def test_log_stream_endpoint_lines(client):
+    """Call /logs/stream with a mocked ZMQ socket to cover all lines."""
+
+    # Dummy socket to mock ZMQ behavior
+    class DummySocket:
+        def __init__(self):
+            self.subscribed = []
+            self.connected = False
+            self.recv_count = 0
+
+        def subscribe(self, topic):
+            self.subscribed.append(topic)
+
+        def connect(self, addr):
+            self.connected = True
+
+        async def recv_multipart(self):
+            # Return one message, then stop generator
+            if self.recv_count == 0:
+                self.recv_count += 1
+                return (b"INFO", b"test message")
+            else:
+                raise StopAsyncIteration
+
+    dummy_socket = DummySocket()
+
+    # Patch Context.instance().socket() to return dummy socket
+    with patch("control_backend.api.v1.endpoints.logs.Context.instance") as mock_context:
+        mock_context.return_value.socket.return_value = dummy_socket
+
+        # Call the endpoint directly
+        response = await logs.log_stream()
+        assert isinstance(response, StreamingResponse)
+
+        # Fetch one chunk from the generator
+        gen = response.body_iterator
+        chunk = await gen.__anext__()
+        if isinstance(chunk, bytes):
+            chunk = chunk.decode("utf-8")
+        assert "data:" in chunk
+
+        # Optional: assert subscribe/connect were called
+        assert dummy_socket.subscribed  # at least some log levels subscribed
+        assert dummy_socket.connected  # connect was called