Testing the Server

• Add a heartbeat to server.py
• Wrap the Flask application with a test client that provides an interface like httpx
• Run pytest test_heartbeat.py to run tests in test_heartbeat.py
• Rewrite using pytest fixtures in test_fixtures.py
  • Don't duplicate the expected value, since it might change
• Patch database connection function in test_db.py instead of creating a fixture
• Use the two approaches together in test_combined.py

Summary