Sinodefence.com has improved a lot but there are mistakes and gaffes around.
Look at this in the J-10 page:
Oct 1986 J-10 project started
1998 Maiden flight successful
1999 Six prototypes produced
20 Dec 1999 Design completed. The six prototypes were transferred to Yanliang-based CFTE for flight test
2000 Q1 Intensive flight test began
2002 Q3 Flight test was relocated to a newly built airbase in the Gebi Desert
2003 Q1 Radar test conducted onboard a Y-8 radar testbed in Shandong Province
2003 Q3 First successful aerial refuelling simulation
2003 Q4 First successful PL-12 MRAAM test fire
2004 Q1 Development completed with the design certificated issued
"Gebi" desert? It's called Gobi desert.
Frankly I have never seen Yanliang to have any J-10s at all. There was never any picture of a J-10 seen in Yanliang. Even though it's possible J-10s could have been tested there, its strange no such pictures eixst and yet there are plenty of pics of J-10s being tested in Chengdu. Pics of Yanliang has shown just about every other prototypes---H-6M, H-6H, various Y-8s, the J-11 with WS-10A engine, the JH-7A, various J-7s and J-8IIs, but never once was there a picture of the J-10. The Google map photo of this base showed pretty much all these aircraft, plus the KJ-2000 and KJ-200 but never a single J-10.
All the early pics of the J-10s were around CAC's private airbase. Even all the extensive testing between 2001 and 2002 were around Chengdu. The pictures of 100X numbered J-10s were all around in Chengdu. The background is easily recognizable as Chengdu is rich and green while Yanliang tends to be desert arid brown.
In 2003 Q1, the radar being tested on the Y-8 radar testbed is that for the J-11 not for the J-10. The picture of the Y-7 testbed with what appaers to be the KLJ-3 radar is an old picture and may have been taken prior to 2001. The prototypes in the 1002-1009 number being tested in Chengdu circa 2001-2002 all had radar as they were sighted and photographed with PL-11 missiles which are semi-active radar guided and requires illumination from the jet fighter's radar.
In March 30 2003, the J-10 was officially accepted into the PLAAF. Various J-10s were spotted in the FTTC base which is in the north and near the Gobi desert, but part of Beijing MR, and in the Wuhu base, home of the 3rd Division. Both bases are also HQs for respective Su-30MKK regiments. It's likely the J-10s are being tested against Su-30MKKs in both locations.
The famous picture of J-10 02 with the PL-12 and other armaments goes hand in hand as part of a larger event that produced other famous pictures of Su-30MKK No. 16 and 19 with the armaments fully displayed in the ground, including R-77s, R-73s, R-27s, Kh-29Ts, Kh-59s, various KAB bombs, blah blah blah. All these pictures are also in the sinodefence.com website. No. 16and 19 MKKs belong to the 3rd Division in Wuhu, which is apparently where all the pictures are taken, and that includes that of J-10 02.