public NebulaCheck.IGen <Test> IfTheReplayIsInAnInvalidFormat_ItThrows() => from gen in DomainGen.Gen() from func in Gen.Function <object, bool>(Gen.Boolean()) from replay in Gen.Constant("0") select Property.ForThese(() => { var property = gen.ForAll(func); Action test = () => property.Check(replay: replay); test.Should() .Throw <GalaxyCheck.Exceptions.GenErrorException>() .WithMessage("Error decoding replay string:*"); });