Add comment around sha256d_flush test
@@ -40,6 +40,7 @@ mod tests {
use crate::sha256d_writer::Sha256dWriter;
#[test]
+ // Just checking that `flush()` succeeds without error.
fn sha256d_flush() {
let preimage = b"foo bar baz";
let mut sha_writer = Sha256dWriter::default();
