public function testMimeType()
 {
     $object = new MemoryDrawing();
     $this->assertInstanceOf('PhpOffice\\PhpPowerpoint\\Shape\\MemoryDrawing', $object->setMimeType());
     $this->assertEquals(MemoryDrawing::MIMETYPE_DEFAULT, $object->getMimeType());
     $this->assertInstanceOf('PhpOffice\\PhpPowerpoint\\Shape\\MemoryDrawing', $object->setMimeType(MemoryDrawing::MIMETYPE_JPEG));
     $this->assertEquals(MemoryDrawing::MIMETYPE_JPEG, $object->getMimeType());
 }