tests: FocusedInputHolder (Android)

[kirillzyusko]

📜 Description

Added tests to FocusedInputHolder. Refactored code, reduced duplications, aligned to JS-based namings.

💡 Motivation and Context

I decided to fully cover a new functionality with unit tests. The ViewHierarchyTraversal was already covered, so I decided to cover other classes. The next one FocusedInputHolder. This is a very simple class, so it contains two unit tests:

• check that weak references implemented correctly;
• check that focus actually calls expected methods.

Along with that I did some refactoring: reduced code fragmentation, reduced code duplication, aligned API to look similar to RN JS API (and hide internals).

📢 Changelog

iOS

• use focus instead of requestFocus;
• FocusedInputHolder.shared.requestFocus() -> FocusedInputHolder.shared.focus();

Android

• added FocusedInputHolderTests
• added focus extension to avoid code duplication;
• use focus extension instead of requestFocus/requestFocusFromJS;
• FocusedInputHolder.requestFocus() -> FocusedInputHolder.focus();
• FocusedInputHolder works with plain EditText (i. e. no react-specific code);
• added get to FocusedInputHolder;

🤔 How Has This Been Tested?

Tested via CI.

📝 Checklist

• [x] CI successfully passed
• [x] I added new mocks and corresponding unit-tests if library API was changed

[github-actions[bot]]

📊 Package size report

Current size	Target Size	Difference
134695 bytes	134361 bytes	334 bytes 📈