chore: Testing infrastructure

[TheRealAgentK]

#91 #92 - Testing infrastructures

Description 📝

Fixes #91 and #92 and provides testing infrastructures for unit and AndroidTests and some initial tests.

Type of change

• New feature (non-breaking change which adds functionality)

Updates

👉 Added testing and mocking libraries
👉 Setup testing infrastructure for unit codes (run in code) and AndroidTests (run on device/emulator)
👉 Added some initial tests

Note: AndroidTests' successes often depend on the device and non-standard setups or the "wrong" developer option set can cause tests to fail. The only way to run them reliably is most often than not on a clean emulator image.

Author to check 👓

• Project and all contained modules build
• Tested on appropriate devices/emulators and SDK versions
• [] Reviewed by another developer
• Appropriate documentation written (code comments, internal docs)

Reviewer to check ✔️

• Change has been tested on a device/emulator
• Code is written to standards
• Appropriate tests have been written (code comments, internal docs)

[miquelbeltran]

Setup and tests look good to me!