### Question:
ModifyFeatureDefinitionLiveCommandImpl extends
        AbstractModifyLiveCommand<ModifyFeatureDefinitionLiveCommand, ModifyFeatureDefinitionLiveCommandAnswerBuilder> implements ModifyFeatureDefinitionLiveCommand { @Nonnull @Override public String toString() { return getClass().getSimpleName() + "[" + super.toString() + "]"; } private  ModifyFeatureDefinitionLiveCommandImpl(final ModifyFeatureDefinition command); @Nonnull static ModifyFeatureDefinitionLiveCommandImpl of(final Command<?> command); @Override String getFeatureId(); @Nonnull @Override FeatureDefinition getDefinition(); @Override Category getCategory(); @Override ModifyFeatureDefinitionLiveCommand setDittoHeaders(final DittoHeaders dittoHeaders); @Override boolean changesAuthorization(); @Nonnull @Override ModifyFeatureDefinitionLiveCommandAnswerBuilder answer(); @Nonnull @Override String toString();  }### Answer:
@Test public void toStringReturnsExpected() { assertThat(underTest.toString()) .contains(underTest.getClass().getSimpleName()) .contains("command=") .contains(twinCommand.toString()); }