expat tests

Hello All,

In the README filet, its written that if check, a unit test framework
for C is installed, complete unit regression tests would be executed.

Before installing check, I used to get 48 tests executed and passed
without any failures and after installing check there is no difference,
I am getting the same result. 

Any insights about how to use check to execute expat tests? I have
installed check in the default location /usr/local/bin..

Thanks much for your help!

-Manish