test: Introduce AdkWebServerTest

[vorburger]

@Poggecci how about this?

This does NOT (yet) cover the #302 problem (if that even is a real problem; TBC) but just tests the ADK Dev Web API - which seems useful in its own right.

I may follow-up on this by adding test coverage for the actual HTML UI, but let's first review this, and I'll do that (or not) in a future separate PR.

[gemini-code-assist]

Summary of Changes

Hello @vorburger, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new set of integration tests for the ADK Dev Web API. The primary purpose is to ensure the core API endpoints function correctly by simulating HTTP requests and validating their responses. These tests specifically target the API functionality and do not cover the HTML UI, laying a foundation for robust API behavior.

Highlights

• New Test File: A new test file AdkWebServerTest.java has been added to the project's test suite.
• API Endpoint Testing: This PR introduces integration tests for various ADK Dev Web API endpoints, including /list-apps, /apps/{appName}/users/{userId}/sessions, and specific session operations (create, get, delete, list).
• Technology Used: The tests leverage Spring Boot's @SpringBootTest and MockMvc to simulate HTTP requests and verify API responses, ensuring the web layer behaves as expected.

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[gemini-code-assist]

Code Review

This pull request introduces integration tests for the AdkWebServer using MockMvc. The tests cover basic CRUD operations for sessions. My main feedback is regarding test isolation. Several tests create resources without cleaning them up, which can lead to flaky and unreliable tests. I've provided specific suggestions to fix these issues by ensuring each test cleans up after itself. This will make the test suite more robust.

[Poggecci]

Thank you for adding this! Less likely we'll have silent web server breakages now. Super valuable since we can't automatically test this internally