public function testShouldSetAndGetFormat()
{
$resource = $this->getMockBuilder('Imanee\\ImageResource\\GDResource')->setMethods(['setFormat', 'getFormat'])->getMock();
$resource->expects($this->once())->method('setFormat')->with('jpeg');
$resource->expects($this->once())->method('getFormat')->will($this->returnValue('jpeg'));
$this->model->setResource($resource);
$this->model->setFormat('jpeg');
$this->assertEquals('jpeg', $this->model->getFormat());
}