### Question:
StringSetPreference extends AbsPreference<Set<String>> { @Override public Set<String> get() { return getPreferences().getStringSet(getKey(), getDefaultValue()); } StringSetPreference(SharedPreferences preferences, String key);  StringSetPreference(SharedPreferences preferences, String key, Set<String> defaultValue); @Override Set<String> get(); @SuppressLint("CommitPrefEdits") @Override void set(Set<String> value);  }### Answer:
@Test public void getValue() { Set<String> expected = new LinkedHashSet<>(); expected.add("Test1"); expected.add("Test2"); expected.add("Test3"); String key = "testKey2"; preferences.edit().putStringSet(key, expected).commit(); StringSetPreference preference = new StringSetPreference(preferences, key); Set<String> result = preference.get(); assertThat(result).isEqualTo(expected); }