assertNull( item1.getBlocked() );
assertNull( item1.getBlocked() );
// reblock with item2, so that we can retract item3
kcontext.blockMatch( item3 );
assertNull( item2.getBlockers() );
assertEquals( 1, item2.getBlocked().size() );
assertEquals(1, item3.getBlockers().size());
assertNull(item3.getBlocked());
assertSame( item2, ((LogicalDependency)item2.getBlocked().getFirst()).getJustifier() );