public void eq_valida_actual4()
 {
     var calculo = new Calculo("0", "0", "3");
     calculo.setCaixas("0", "0", "3");
     calculo.setCaixasCor("normal", "normal", "normal");
     calculo.botaoCalcular_Click(null, EventArgs.Empty);
     Assert.AreEqual("vazio", calculo.getEqValidaActual());
 }
 public void eq_valida_actual()
 {
     var calculo = new Calculo("-5", "-2", "-1");
     calculo.setCaixas("-5", "-2", "-1");
     calculo.setCaixasCor("normal", "normal", "normal");
     calculo.botaoCalcular_Click(null, EventArgs.Empty);
     Assert.AreEqual("-5x*x+-2*x+-1", calculo.getEqValidaActual());
 }