public function testIsAnimated()
 {
     $encoder = new Encoder();
     $this->assertFalse($encoder->isAnimated());
     $encoder->addFrame(Mockery::mock('Intervention\\Gif\\Frame'));
     $this->assertFalse($encoder->isAnimated());
     $encoder->addFrame(Mockery::mock('Intervention\\Gif\\Frame'));
     $this->assertTrue($encoder->isAnimated());
 }