Bug 47766

In the test we are doing stuff like: check(53, 71, 0, 0, 0, 0, [e.body]); check(53, 71, 0, 10, 0, 10, [e.p3, e.body]); check(53, 71, 10, 0, 10, 0, [e.d1, e.h1, e.body]); check(53, 71, 10, 10, 10, 10, [e.p3, e.d1, e.h1, e.body]); Now that we support specifying the four direction to expansion separately, we can enrich these tests. It would turn to: check(53, 71, 0, 0, 0, 0, [e.body]); check(53, 71, 10, 0, 0, 0, [result]); check(53, 71, 0, 10, 0, 0, [result]); check(53, 71, 0, 0, 10, 0, [result]); check(53, 71, 0, 0, 0, 10, [result]); check(53, 71, 10, 10, 0, 0, [result]); check(53, 71, 10, 10, 0, 10, [result]); etc... Combinations are up to us.