public function testRotate() { $imageProcessor = $this->getMockBuilder('Magento\\Framework\\Image')->disableOriginalConstructor()->getMock(); $imageProcessor->expects($this->once())->method('rotate')->with(90)->will($this->returnValue(true)); $this->image->setImageProcessor($imageProcessor); $result = $this->image->rotate(90); $this->assertSame($this->image, $result); }