public void Domain_Conta_Validar_SaldoNegativo_DeveLancarExcessao() { //Arrange _conta = ContaObjectMother.GetContSaldoNegativoComMock(_cliente.Object); _conta.Limite = -100; //Action Action act = () => _conta.Validar(); //Verify act.Should().Throw <ContaSaldoMenorQueZeroException>(); }