A simple Android app that contains a list with different numbers of cells on each row. It represents an implemented Music Player.
Three entities implement Music Player:
- User: Represents the user of the Music Player.
- Music: Represents the music that is used to play in the Music Player.
- Player: Implements the Music Player operations.
User has only one property named type that represents the type of the user, whether REGULAR or PREMIUM.
Music has three properties:
idthat assigns an ID to each music and is used for identification.statethat holds the playing state of the music, whether PLAYING or STOPPED.durationthat holds the music playback time in milliseconds.
Also, Music comprises play, pause, and stop functions of itself.
Player has one property: musicQueue that holds the Music Queue of the player. Also, Player comprises methods for managing the Player functionalities, e.g., getPlayingMusic() and addMusicToQueue().
There are three classes of Exceptions:
- IllegalOperationException: Is thrown when the user wants to do a not-allowed operation in MusicPlayer, e.g., pausing a previously paused music.
- IllegalQueueSizeException: Is thrown when the user wants to use a queue with a not-allowed size.
- NotPremiumUserException: Is thrown when a Regular User wants to use a Premium-Only feature.
Four classes test MusicPlayer functionalities by JUnit 5:
- PlayerRegularUserTest: Tests the features which are dependent on the type of user with a Regular User.
- PlayerPremiumUserTest: Tests the features which are dependent on the type of user with a Premium User.
- PlayerGeneralTest: It is a Test Suite that tests the general features of the player, independent from user type.
- PlayerTestSuite: Tests all these three Test classes, It covers functionalities of the Player entity.
A simple list presentation that has one cell on even index rows and two cells on odd index ones. The colors of cells are set randomly.