public function testGetTtl()
 {
     $page = $this->getMock('Sonata\\PageBundle\\Model\\PageInterface');
     $block = new Block();
     $block->setPage($page);
     $this->assertFalse($block->hasChildren());
     $child1 = $this->getMock('Sonata\\PageBundle\\Model\\BlockInterface');
     $child1->expects($this->once())->method('getTtl')->will($this->returnValue(100));
     $child2 = $this->getMock('Sonata\\PageBundle\\Model\\BlockInterface');
     $child2->expects($this->once())->method('getTtl')->will($this->returnValue(50));
     $child3 = $this->getMock('Sonata\\PageBundle\\Model\\BlockInterface');
     $child3->expects($this->once())->method('getTtl')->will($this->returnValue(65));
     $block->addChildren($child1);
     $block->addChildren($child2);
     $block->addChildren($child3);
     $this->assertEquals(50, $block->getTtl());
     $this->assertTrue($block->hasChildren());
 }