message: test: Replace hashlib.new with named constructor
diff: @@ -64,13 +64,15 @@ FILTER_TYPE_BASIC = 0
  WITNESS_SCALE_FACTOR = 4
  -# Serialization/deserialization tools
  +
  def sha256(s):
  - return hashlib.new('sha256', s).digest()
  + return hashlib.sha256(s).digest()
  +
  def hash256(s):
  return sha256(sha256(s))
  +
  def ser_compact_size(l):
  r = b""
  if l < 253:
  