diff --git a/bin/pytest-summary b/bin/pytest-summary
new file mode 100755
index 00000000..29e32101
--- /dev/null
+++ b/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 "$@"
diff --git a/src/summary/pyproject.toml b/src/summary/pyproject.toml
index bc300add..eb23f943 100644
--- a/src/summary/pyproject.toml
+++ b/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/*" = [
diff --git a/src/summary/tests/__init__.py b/src/summary/tests/__init__.py
new file mode 100644
index 00000000..224e5ad5
--- /dev/null
+++ b/src/summary/tests/__init__.py
@@ -0,0 +1 @@
+"""Tests for the summary service."""
diff --git a/src/summary/tests/api/__init__.py b/src/summary/tests/api/__init__.py
new file mode 100644
index 00000000..bce0b500
--- /dev/null
+++ b/src/summary/tests/api/__init__.py
@@ -0,0 +1 @@
+"""Tests for the API summary service."""
diff --git a/src/summary/tests/api/test_api_health.py b/src/summary/tests/api/test_api_health.py
new file mode 100644
index 00000000..0460b1d8
--- /dev/null
+++ b/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
diff --git a/src/summary/tests/conftest.py b/src/summary/tests/conftest.py
new file mode 100644
index 00000000..cbce00b9
--- /dev/null
+++ b/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)