new_contents: import pytest
  from plenum.common.types import ConsistencyProof
  from collections import OrderedDict
  from plenum.common.messages.fields import NonNegativeNumberField, \
      LedgerIdField, MerkleRootField, IterableField
  
  EXPECTED_ORDERED_FIELDS = OrderedDict([
      ("ledgerId", LedgerIdField),
      ("seqNoStart", NonNegativeNumberField),
      ("seqNoEnd", NonNegativeNumberField),
      ("ppSeqNo", NonNegativeNumberField),
      ("oldMerkleRoot", MerkleRootField),
      ("newMerkleRoot", MerkleRootField),
      ("hashes", IterableField),
  ])
  
  
  def test_hash_expected_type():
      assert ConsistencyProof.typename == "CONSISTENCY_PROOF"
  
  
  def test_has_expected_fields():
      actual_field_names = OrderedDict(ConsistencyProof.schema).keys()
      assert actual_field_names == EXPECTED_ORDERED_FIELDS.keys()
  
  
  def test_has_expected_validators():
      schema = dict(ConsistencyProof.schema)
      for field, validator in EXPECTED_ORDERED_FIELDS.items():
          assert isinstance(schema[field], validator)
  
subject: add test for ConsistencyProof message