End-to-end testing checks whether an entire application delivers the expected user experience under real-world conditions. Unlike unit and integration tests, it exercises the frontend, backend, and external services together without mocking them. section 11.2.1 section 11.6
A practical end-to-end test can:
- Start a running Streamlit application with AppTest. section 11.6
- Enter a realistic search term and trigger the user action. section 11.6
- Verify that results arrive and the interface renders the expected elements. section 11.6
- Run repeatedly after code changes, while recognizing that external services can add delay, limits, or cost. section 11.7
Movie search flow
A test creates an AppTest instance from frontend.py, runs the app, enters “Inception” in the sidebar, and clicks the search button. It then checks that session state contains results, at least one result exists, and an expander and title appear for each returned movie. The live TMDB API supplies the data, so no backend patching or mock data is used. section 11.6
