Add missing await and add test for Service future creation (#42)

* Add missing `await`

* Add test for service future creation

src/anycastd/core/_run.py

@@ -22,4 +22,4 @@ async def run_services(services: Iterable[Service]) -> None:
     Args:
         services: The services to run.
     """
-    asyncio.gather(*(service.run() for service in services))
+    await asyncio.gather(*(service.run() for service in services))

tests/test_run.py

@@ -0,0 +1,16 @@
+import pytest
+from anycastd.core._run import run_services
+from anycastd.core._service import Service
+
+
+@pytest.fixture
+def mock_services(mocker):
+    """A set of mock services."""
+    return [mocker.AsyncMock(Service) for _ in range(3)]
+
+
+@pytest.mark.asyncio
+async def test_future_created_for_each_service(mock_services):
+    """A future is created for each service."""
+    await run_services(mock_services)
+    assert all(mock_service.run.called for mock_service in mock_services)