### Question:
PropertyStoreCommonsConfig extends AbstractPropertyStore { @Override public boolean existProperty(String name) { Util.assertHasLength(name); return conf().containsKey(name); } PropertyStoreCommonsConfig();  PropertyStoreCommonsConfig(Configuration configuration); @Override boolean existProperty(String name); @Override void deleteProperty(String name); Set<String> listPropertyNames(); @Override void createProperty(Property<T> value); @Override Property<?> readProperty(String name); @Override Map<String, Property<?>> readAllProperties(); @Override void clear(); Configuration getConfiguration(); void setConfiguration(Configuration configuration);  }### Answer:
@Test(expected = IllegalStateException.class) public void initializationKO() { PropertyStoreCommonsConfig psConf = new PropertyStoreCommonsConfig(); psConf.existProperty("toto"); }