ci: add deployment workflow and automated tests

tests/conftest.py

@@ -0,0 +1,26 @@
+from collections.abc import Iterator
+
+import pytest
+from fastapi.testclient import TestClient
+
+from dependencies import get_session
+from main import app
+from tests.fakes import FakeSession
+
+
+@pytest.fixture
+def fake_session() -> FakeSession:
+    return FakeSession()
+
+
+@pytest.fixture
+def client(fake_session: FakeSession) -> Iterator[TestClient]:
+    def override_get_session() -> Iterator[FakeSession]:
+        yield fake_session
+
+    app.dependency_overrides[get_session] = override_get_session
+
+    with TestClient(app) as test_client:
+        yield test_client
+
+    app.dependency_overrides.clear()