### Question:
UpdateSymRef extends AbstractGeoGigOp<Optional<Ref>> { public UpdateSymRef setName(String name) { this.name = name; return this; }  UpdateSymRef setName(String name); UpdateSymRef setNewValue(String newValue); UpdateSymRef setOldValue(String oldValue); UpdateSymRef setDelete(boolean delete); UpdateSymRef setReason(String reason);  }### Answer:
@Test public void testNoValue() { exception.expect(IllegalStateException.class); geogig.command(UpdateSymRef.class).setName(Ref.HEAD).call(); }