fix api integration quality baseline

tests/api/test_entities.py

@@ -1,10 +1,46 @@
+from collections.abc import Sequence
+
 from fastapi.testclient import TestClient
+
+from app.ha.models import HaEntitySummary
+from app.ha.reader import HaReader
 from app.main import app
 
-client = TestClient(app)
+
+class FakeHaReader(HaReader):
+    def __init__(self) -> None:
+        pass
+
+    def read_entities(self) -> Sequence[HaEntitySummary]:
+        return [HaEntitySummary(entity_id="sensor.temperature", domain="sensor")]
 
 
 def test_openapi_docs_are_available() -> None:
-    response = client.get("/docs")
+    with TestClient(app) as client:
+        response = client.get("/docs")
     assert response.status_code == 200
     assert "SillyHome Next API" in response.text
+
+
+def test_entities_returns_reader_data() -> None:
+    with TestClient(app) as client:
+        app.state.ha_reader = FakeHaReader()
+        response = client.get("/v1/entities")
+    assert response.status_code == 200
+    assert response.json() == [
+        {
+            "entity_id": "sensor.temperature",
+            "domain": "sensor",
+            "state_class": None,
+            "device_class": None,
+            "unit_of_measurement": None,
+        }
+    ]
+
+
+def test_entities_returns_503_without_home_assistant_config() -> None:
+    with TestClient(app) as client:
+        if hasattr(app.state, "ha_reader"):
+            delattr(app.state, "ha_reader")
+        response = client.get("/v1/entities")
+    assert response.status_code == 503