public function testRemoveDefinition()
 {
     $tubePressDefinition = $this->mock('tubepress_internal_ioc_Definition');
     $symfonyDefinition = $this->mock('Symfony\\Component\\DependencyInjection\\Definition');
     $tubePressDefinition->shouldReceive('getUnderlyingSymfonyDefinition')->once()->andReturn($symfonyDefinition);
     $this->assertFalse($this->_sut->has('x'));
     $this->_sut->setDefinition('x', $tubePressDefinition);
     $this->assertTrue($this->_sut->has('x'));
     $this->_sut->removeDefinition('x');
     $this->assertFalse($this->_sut->has('x'));
 }