feature: setup unit testing

[rros]

Type of change(s)

• Bug fix
• Feature / enhancement
• Infrastructure / tooling (CI, build, deps, tests)
• Documentation

What changed and why

This PR adds unit testing libraries for normal tests and android tests. It also adds a test utility function for expected failures for unit tests which are known to fail due to a known bug. This way tests for known issues can be added without breaking the build.

Closes the following issue(s)

Doesn't close a specific issue, but the lack of unit tests is mentioned in several places: #37, #89

Checklist

• I read the contribution guidelines.
• I manually tested my changes on device/emulator (if applicable).
• I updated the "Unreleased" section in CHANGELOG.md (if applicable).
• I have self-reviewed my pull request (no typos, formatting errors, etc.).
• I understand every change in this pull request.