✅(summary) add minimal test suite for health endpoint

Based on cameldev's work, introduce basic tests to ensure the
health endpoint responds correctly.

bin/pytest-summary

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+source "$(dirname "${BASH_SOURCE[0]}")/_config.sh"
+
+_dc_run \
+    app-summary-dev \
+    python -m pytest "$@"

src/summary/pyproject.toml

@@ -21,8 +21,16 @@ dependencies = [
 [project.optional-dependencies]
 dev = [
     "ruff==0.14.4",
+    "pytest==9.0.2",
+    "responses>=0.25.8",
 ]
 
+[tool.pytest.ini_options]
+markers = [
+    "api: Test the API",
+]
+testpaths = ["tests"]
+
 [build-system]
 requires = ["setuptools>=61.0"]
 build-backend = "setuptools.build_meta"
@@ -49,6 +57,7 @@ select = [
     "T20", # flake8-print
     "W",  # pycodestyle warning
 ]
+ignore= ["PLR2004"]
 
 [tool.ruff.lint.per-file-ignores]
 "tests/*" = [

src/summary/tests/__init__.py

@@ -0,0 +1 @@
+"""Tests for the summary service."""

src/summary/tests/api/__init__.py

@@ -0,0 +1 @@
+"""Tests for the API summary service."""

src/summary/tests/api/test_api_health.py

@@ -0,0 +1,21 @@
+"""Integration tests for the health check endpoints."""
+
+
+class TestHeartbeat:
+    """Tests for the /__heartbeat__ endpoint."""
+
+    def test_returns_200(self, client):
+        """The heartbeat endpoint responds with 200 OK without a token."""
+        response = client.get("/__heartbeat__")
+
+        assert response.status_code == 200
+
+
+class TestLBHeartbeat:
+    """Tests for the /__lbheartbeat__ endpoint."""
+
+    def test_returns_200(self, client):
+        """The load-balancer heartbeat endpoint responds with 200 OK without a token."""
+        response = client.get("/__lbheartbeat__")
+
+        assert response.status_code == 200

src/summary/tests/conftest.py

@@ -0,0 +1,12 @@
+"""Integration test configuration. Provides shared fixtures."""
+
+import pytest
+from fastapi.testclient import TestClient
+
+from summary.main import app
+
+
+@pytest.fixture()
+def client():
+    """Provide a FastAPI TestClient for integration tests."""
+    return TestClient(app)