### Question:
DeviceManagerImpl implements DeviceManager { @Override public String getTimeStamp() { return ButtonUtil.formatDate(date.get()); } @VisibleForTesting  DeviceManagerImpl(Context context); @WorkerThread @Nullable @Override String getAdvertisingId(); @Override Map<String, String> getSignals(); @Override String getTimeStamp(); @Override boolean isOldInstallation(); @Override String getUserAgent();  }### Answer:
@Test public void getTimeStamp_verifyCorrectDateConversion() { final long currentTime = 1523560676528L; deviceManager.date = new Getter<Date>() { @Override public Date get() { return new Date(currentTime); } }; assertEquals(deviceManager.getTimeStamp(), ButtonUtil.formatDate(new Date(currentTime))); }