Add comment about where the sapling empty merkle roots come from
@@ -158,6 +158,7 @@ mod tests {
use super::*;
+ // From https://github.com/zcash/librustzcash/blob/master/zcash_primitives/src/merkle_tree.rs#L512
const HEX_EMPTY_ROOTS: [&str; 33] = [
"0100000000000000000000000000000000000000000000000000000000000000",
"817de36ab2d57feb077634bca77819c8e0bd298c04f6fed0e6a83cc1356ca155",
