text: import pytest
  
  import deal
  
  from .helpers import run_sync
  
  
  def test_safe():
      func = deal.safe(lambda x: 1 / x)
      func(2)
      with pytest.raises(deal.RaisesContractError):
          func(0)
  
  
  def test_decorating_async_function():
      @deal.safe
      async def func(x):
          return 10 / x
  
      assert run_sync(func(2)) == 5
      with pytest.raises(deal.RaisesContractError):
          run_sync(func(0))
  