Firebase Image Uploader and Gallery:

Project Architecture:

• I have used Kotlin as the development language and MVVM as an architecture so that there won't be any tight coupling between components and we can test the code easily
• Firebase is used as the backend
• Hilt is used for Dependency Injection to inject all the required modules
• The app is designed as a single Activity architecture
• A Repository class which act as a bridge between View model and Firebase Data Source
• FirebaseSource class to communicate with Firebase and provide results to Repository class
• A Resource class is used to wrap API response and to handle the response with LiveData
• Data Binding is used to bind data to Recyclerview
• Glide is used for loading images and optimizing memory
• Memory leaks are handled properly
• KTX library is used for avoiding lots of boiler plate codes
• A 3rd party library is used for crop and rotate feature - https://github.com/ArthurHub/Android-Image-Cropper

Testing Architecture:

• Unit test cases are developed using JUnit
• Instrumentation test cases are added for testing Room Database
• UI Automation test cases are added using Espresso and Page Object Model
• We are using Intent stub for testing gallery upload and camera upload features
• Counting Idling resource is used to wait for asyn operation when running Espresso tests

More Testing Strategy:

• Need to add more unit test cases to test LiveData observers and Viewmodel using Mocking framework (Mockito, Mockk)
• Need to write more Espresso test cases to verify recycler view images after they are uploaded
• Need to add some Espresso UI test cases for testing network related scenarios using UI Automator