message: Fix `PendingSignatures` test.
diff: @@ -179,7 +179,9 @@ mod tests {
  let sig_a2 = FinalitySignature::random_for_block(block_hash, 0);
  let sig_b = FinalitySignature::random_for_block(block_hash_other, 0);
  assert!(pending_sigs.add(Signature::External(Box::new(sig_a1.clone()))));
  + assert!(pending_sigs.mark_bonded(sig_a1.public_key.clone(), block_hash));
  assert!(pending_sigs.add(Signature::External(Box::new(sig_a2.clone()))));
  + assert!(pending_sigs.mark_bonded(sig_a2.public_key.clone(), block_hash));
  assert!(pending_sigs.add(Signature::External(Box::new(sig_b))));
  let collected_sigs: BTreeMap<PublicKey, FinalitySignature> = pending_sigs
  .collect_pending(&block_hash)
  