PersistenceMigrationsSample/app/src/androidTestRoom2/java/com/example/android/persistence/migrations/LocalUserDataSourceTest.java [37:91]:
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    private UsersDatabase mDatabase;
    private LocalUserDataSource mDataSource;

    @Before
    public void initDb() throws Exception {
        // using an in-memory database because the information stored here disappears when the
        // process is killed
        mDatabase = Room.inMemoryDatabaseBuilder(ApplicationProvider.getApplicationContext(),
                UsersDatabase.class).build();
        mDataSource = new LocalUserDataSource(mDatabase.userDao());
    }

    @After
    public void closeDb() throws Exception {
        mDatabase.close();
    }

    @Test
    public void insertAndGetUser() {
        // When inserting a new user in the data source
        mDataSource.insertOrUpdateUser(USER);

        //The user can be retrieved
        User dbUser = mDataSource.getUser();
        assertEquals(dbUser.getId(), USER.getId());
        assertEquals(dbUser.getUserName(), USER.getUserName());
        assertEquals(dbUser.getDate(), USER.getDate());
    }

    @Test
    public void updateAndGetUser() {
        // Given that we have a user in the data source
        mDataSource.insertOrUpdateUser(USER);

        // When we are updating the name of the user
        User updatedUser = new User(USER.getId(), "new username", USER.getDate());
        mDataSource.insertOrUpdateUser(updatedUser);

        //The retrieved user has the updated username
        User dbUser = mDataSource.getUser();
        assertEquals(dbUser.getId(), USER.getId());
        assertEquals(dbUser.getUserName(), "new username");
    }

    @Test
    public void deleteAndGetUser() {
        // Given that we have a user in the data source
        mDataSource.insertOrUpdateUser(USER);

        //When we are deleting all users
        mDataSource.deleteAllUsers();

        // The user is no longer in the data source
        User dbUser = mDataSource.getUser();
        assertNull(dbUser);
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PersistenceMigrationsSample/app/src/androidTestRoom3/java/com/example/android/persistence/migrations/LocalUserDataSourceTest.java [37:91]:
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    private UsersDatabase mDatabase;
    private LocalUserDataSource mDataSource;

    @Before
    public void initDb() throws Exception {
        // using an in-memory database because the information stored here disappears when the
        // process is killed
        mDatabase = Room.inMemoryDatabaseBuilder(ApplicationProvider.getApplicationContext(),
                UsersDatabase.class).build();
        mDataSource = new LocalUserDataSource(mDatabase.userDao());
    }

    @After
    public void closeDb() throws Exception {
        mDatabase.close();
    }

    @Test
    public void insertAndGetUser() {
        // When inserting a new user in the data source
        mDataSource.insertOrUpdateUser(USER);

        //The user can be retrieved
        User dbUser = mDataSource.getUser();
        assertEquals(dbUser.getId(), USER.getId());
        assertEquals(dbUser.getUserName(), USER.getUserName());
        assertEquals(dbUser.getDate(), USER.getDate());
    }

    @Test
    public void updateAndGetUser() {
        // Given that we have a user in the data source
        mDataSource.insertOrUpdateUser(USER);

        // When we are updating the name of the user
        User updatedUser = new User(USER.getId(), "new username", USER.getDate());
        mDataSource.insertOrUpdateUser(updatedUser);

        //The retrieved user has the updated username
        User dbUser = mDataSource.getUser();
        assertEquals(dbUser.getId(), USER.getId());
        assertEquals(dbUser.getUserName(), "new username");
    }

    @Test
    public void deleteAndGetUser() {
        // Given that we have a user in the data source
        mDataSource.insertOrUpdateUser(USER);

        //When we are deleting all users
        mDataSource.deleteAllUsers();

        // The user is no longer in the data source
        User dbUser = mDataSource.getUser();
        assertNull(dbUser);
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