### Question:
InMemoryPersister implements ConfigPersister { @Override public String getId() { return ID; } InMemoryPersister(); @Override void saveConfiguration(final ComplexConfigDTO configDTO); @Override ComplexConfigDTO loadConfiguration(final ScopePath scopePath); @Override void updateConfiguration(final ComplexConfigDTO configDTO); @Override String getId(); @Override Collection<ScopePath> listScopes(final String scopeName, final Map<String, String> properties); @Override void delete(final ScopePath scopePath, final boolean deleteChildren); @Override void deleteAllOccurences(final String scopeName, final Map<String, String> properties); static final String ID; }### Answer:
@Test public void testGetId() { assertEquals(InMemoryPersister.ID, persister.getId()); }