The wonderful Ginger O Rama produces an excellent blog on all things ethical in the cosmetics industry. She recently posted about an idea that was given to her by another blogger http://blushingbiddies.com/ who suggested if you want to find brands that sell in Mainland China, look at chinese department and makeup stores websites and see what brands they stock! Chrome Translate is handy to find your way around the sites.
Sephora and Shanghai Pacific Department Store brands
By checking what brands they sell we can see what brands to avoid even if they claim to be cruelty free.
Remember of course Hong Kong is not included as they have a separate law in tune with the deal made with the UK to hand it back to China.
We can see in those links, and others, many obvious 'avoid like the plague' brands but there are also brands which like to say they are cruelty free but very much are not - Benefit. Stila, Anna Sui, Bliss, Amazing Cosmetics.
Other big companies such as Boots sell in Mainland China ( putting aside the fact Boots is a pharmaceutical company and thus does other kinds of animal testing) it's always said it's own brand cosmetics are cruelty free. But those brands are sold in Mainland China stores.
Another site to check is Skin Store China, http://www.skinstorechina.com/Product/BrandList.aspx
So yeah, another avenue to try to get to the truth of it