This is a internet hoax and a Photoshop job. Pay no attention to this. Besides, if China were to be conducting flight tests of it's "J-15" or first ever indigenous stealth fighter air craft, Chinese Air Force officials would clear the area to prevent the possibility to even take such photos.
Also not to mention the photo is quite blurry and very low quality and maybe I'm wrong but the size of the two air crafts seem a bit out of proportion compared to the background and building...
Another thing I would like to mention, I also doubt that if China were to conduct secret flights of it's "J-15" or as some call it "J-XX" that they would conduct the flights in broad day light, the photo shows a crystal clear day. IMHO, such an important and covert flight practice would be taken at night time.
That is my brief analysis, it strongly appears to be a hoax.