First of all what India is testing is not mid course interceptors,India currently had not tested or had not planned for mid course interceptors.
Only U.S,Russia and China posses that capacity,it is used to shoot down ICBM's
As claimed by many China is not the second nation to achive it,it was Russia,the missile is known as A-135.
I saw some Chinese making a comment that Russia is behind China and Russian's r incapable,and I think some Indian also claimed that Russia is decades ahead of China.
That Indian whoever was that made a completely wrong statement,China is not decades behind the Russian,they r generation's behind,but unfortunately some fanboys not understand it here.
About Indian ABM ,its exoatmospheric interceptor and India is the 4th nation to develop it after U.S, Russia and Israel.
It is used against IRBM's.
So far China is not known to have any Exo or endo atmospheric capability though they claim that some of their long range sam's likeHQ-19 and HQ-9.
And yes Chinese KT-3 missile can intercept any target at a height of more than 1000 kms(mid course).