[RNMobile] File Block VI-a: Implementing unit tests

[etoledom]

Description

Two simple snapshot tests for the File block:

• Placeholder state
• File rendered state

How has this been tested?

• CI test-unit:native must be ✅

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR.

[github-actions]

Size Change: 0 B

Total Size: 1.2 MB

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[jd-alexander]

Thanks for these tests @etoledom. Looking good! Will we be covering any other cases such as the try/cancel states?

[etoledom]

Will we be covering any other cases such as the try/cancel states?

For the error state it's not strait forward, since we need access to the deeply nested MediaUploadProgress component. But I will give it a try after merging this and updating the error handling PR accordingly 👍

Thanks for the review!