### Question:
SharedPreferencesUserStorage implements UserStorage { @Override public void clearTimestamp() { mSharedPreferences.edit() .remove(mResources.getString(R.string.prefs_key_created_utc)) .apply(); } @Inject  SharedPreferencesUserStorage(SharedPreferences sharedPreferences, Resources resources); @Override int getNumberToRequest(); void setSeenTimestamp(long createdAtUtc); @Override void clearTimestamp(); @Override String getSortType(); @Override String getSubreddits(); @Override Set<String> getSubredditCollection(); @Override String getRefreshInterval(); @Override long getTimestamp(); @Override boolean messagesEnabled(); @Override boolean downloadFullSizedImages(); @Override boolean openOnPhoneDismissesAfterAction();  }### Answer:
@Test public void clearTimestamp_shouldRemoveTimestamp() { mStorage.clearTimestamp(); verify(mEditor).remove(PREFS_KEY_CREATED_UTC); }