Updated tests to build with latest rust-nightly

rustc 0.13.0-nightly (63c4f22f2 2014-11-05 22:31:44 +0000)

Now the Eq-trait for [u8, ..64] seems to be removed (or moved somewhere else).

The workaround is to change:
assert!(x == y);
to
assert!(x.as_slice() == y.as_slice());