public function testCallbackOnAfterCreate()
 {
     $blueprint = new FixtureBlueprint('FixtureFactoryTest_DataObject');
     $this->_called = 0;
     $self = $this;
     $cb = function ($obj, $identifier, $data, $fixtures) use($self) {
         $self->_called = $self->_called + 1;
     };
     $blueprint->addCallback('afterCreate', $cb);
     $this->assertEquals(0, $this->_called);
     $obj1 = $blueprint->createObject('one');
     $this->assertEquals(1, $this->_called);
     $obj2 = $blueprint->createObject('two');
     $this->assertEquals(2, $this->_called);
     $this->_called = 0;
 }