/**
  * @covers \ImageTransform\Transformation::__call
  * @covers \ImageTransform\Transformation::getStack
  */
 public function testSuccessfulDelegation()
 {
     $methodName = 'dummyCallback';
     $stubTransformation = $this->getMock('\\Object', array($methodName));
     Transformation::addTransformation($stubTransformation);
     $transformation = new Transformation();
     $this->assertEquals(0, count($transformation->getStack()));
     $transformation->dummyCallback();
     $this->assertEquals(1, count($transformation->getStack()));
     $transformation->dummyCallback();
     $this->assertEquals(2, count($transformation->getStack()));
     return $transformation;
 }