Add tests for OpaClient

Author: tpoliaw

tests/unit_tests/service/test_authorization.py

@@ -0,0 +1,48 @@
+from unittest.mock import MagicMock, patch
+
+import pytest
+from pydantic import HttpUrl
+
+from blueapi.config import OpaConfig
+from blueapi.service.authorization import (
+    OpaClient,
+)
+
+# Reusable client patch decorator
+patch_client_session = patch(
+    "blueapi.service.authorization.ClientSession",
+    name="mock_client_session",
+    spec=True,
+)
+
+
+@pytest.fixture(scope="module")
+def opa_config() -> OpaConfig:
+    return OpaConfig(
+        root=HttpUrl("http://auth.example.com"),
+    )
+
+
+@patch_client_session
+async def test_session_closed(session: MagicMock, opa_config: OpaConfig):
+    async with OpaClient.for_config("p45", opa_config):
+        pass
+    session().close.assert_called_once()
+
+
+@patch_client_session
+async def test_opa_client_for_config(session: MagicMock, opa_config: OpaConfig):
+    async with OpaClient.for_config("p45", opa_config) as opa:
+        assert opa is not None
+        session.assert_called_once_with(base_url="http://auth.example.com/")
+
+
+@pytest.mark.parametrize("instrument", [None, "p99"])
+async def test_opa_client_without_config(instrument: str | None):
+    async with OpaClient.for_config(instrument, None) as opa:
+        assert opa is None
+
+
+async def test_opa_fails_without_instrument(opa_config: OpaConfig):
+    with pytest.raises(ValueError, match="Instrument name is required"):
+        OpaClient.for_config(None, opa_config)