text: import pytest
  
  import deal
  
  
  def test_chained_contract_decorator():
  
      @deal.chain(
          deal.pre(lambda x: x != 1),
          deal.pre(lambda x: x != 2),
      )
      def func(x):
          return x * 4
  
      func(3)
      func(0)
      with pytest.raises(deal.PreContractError):
          func(1)
      with pytest.raises(deal.PreContractError):
          func(2)
  