AppTest - add support for st.image and st.download_button

[mpalmer23]

Checklist

• [X] I have searched the existing issues for similar feature requests.
• [X] I added a descriptive title and summary to this issue.

Summary

Requesting st.image and st.download_button to be added to AppTest

Why?

Images and download buttons are key features of our streamlit app, and we'd like to use AppTest to write automated tests for these widgets.

How?

New properties within AppTest class for getting sequences of all st.image and st.download_button widgets.

Additional Context

No response

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[Asaurus1]

As a workaround, I think you should be able to do something like at.get("imgs") or at.get("download_button")

[mpalmer23]

As a workaround, I think you should be able to do something like at.get("imgs") or at.get("download_button")

Thanks for the suggestion. This works and helps us set up some basic checks.

Would still be good to eventually be able to use AppTest's more advanced interaction-simulation at some point.

[asmaier]

As a workaround, I think you should be able to do something like at.get("imgs") or at.get("download_button")

Is it possible to click the download button and receive the file from at.get("download_button") ?