@Test
public void testGeadHeadRevisionSimple() throws Exception {
SimpleNodeScenario scenario = new SimpleNodeScenario(mongoConnection);
String revisionId = scenario.create();
GetHeadRevisionCommandMongo command = new GetHeadRevisionCommandMongo(mongoConnection);
String revisionId2 = command.execute();
assertTrue(revisionId.equals(revisionId2));
scenario.delete_A();
String revisionId3 = command.execute();
assertFalse(revisionId3.equals(revisionId2));
}}