It'd be very helpful for projects that use ObjC++ to be able to test equality 
using the |-[id<NSObject> isEqual:]| method. Currently, to do this, one does:

  EXPECT_TRUE([obj isEqual:foo]);

That produces less helpful output than

  EXPECT_NSEQ(obj, foo);

Because the latter could also print mismatch information using the 
|-description| method.

CL here: http://codereview.appspot.com/1743056