Hello, I'm trying to deploy an apex class to production but I can't because it gives me 72% of coverage code.
This is my apex class;
Does anyone know how to test this apex class? I really will appreciate any help

public with sharing class FacturaPDFController {

    private final Factura__c fct;
    public cFactura cfct{get; set;}
    public OT__c ots{get; set;}
    public xOT otts {get; set;}
    public Integer total{get; set;}
    public List<cOT> cOTList{get;set;}
    public List<cLdd> cLddList{get;set;}

    public FacturaPDFController(ApexPages.StandardController controller) {
        this.fct =  [Select Id, Pre_Factura__r.ST_Exentas__c, Pre_Factura__r.Descuento__c, Pre_Factura__r.ST_Gravadas_IVA10__c,                         Pre_Factura__r.Total_a_Pagar__c, Pre_Factura__r.IVA_10__c From Factura__c  Where Id = :controller.getId()];
        this.cfct = new cFactura(this.fct);
        total = Integer.valueOf( this.fct.Pre_Factura__r.Total_a_Pagar__c );



        //OT personalizado
        this.ots= [Select Cant_1__c,Cant_2__c,Cant_3__c,Cant_4__c,Cant_5__c, Texto_1_fact__c,Texto_2_fact__c,Texto_3_fact__c,
        Texto_4_fact__c,Texto_5_fact__c, Precio_Unit_1__c, Precio_Unit_2__c, Precio_Unit_3__c, Precio_Unit_4__c, Precio_Unit_5__c,
        Total_Ex_1__c, Total_Ex_2__c, Total_Ex_3__c, Total_Ex_4__c, Total_Ex_5__c,
        Total_Gra_1__c, Total_Gra_2__c, Total_Gra_3__c, Total_Gra_4__c, Total_Gra_5__c        
        from OT__c  where Pre_Factura__c = :this.fct.Pre_Factura__r.id];
        this.otts=new xOT(this.ots);
        
        
        
        //OT List
        this.cOTList = new List<cOT>();
        for(OT__c o : [Select Id, Codigo_2__c, Cantidad_2__c, Descripcion_2__c, Sub_Total__c, Exentas_2__c, Gravadas_IVA_10_2__c
        from OT__c  where Pre_Factura__c = :this.fct.Pre_Factura__r.id LIMIT 10]){
            cOTList.add(new cOT(o));
        }

        //LDD List
        this.cLddList = new List<cLdd>();
        for(Linea_de_detalle__c l : [Select Q__c, P_Unit_Linea__c, Total_Exentas__c, Total_Gravadas_IVA_10__c, Producto__r.Codigo__c,                   Producto__r.Descripcion__c from Linea_de_detalle__c Where OT__r.Pre_Factura__c = :this.fct.Pre_Factura__r.id LIMIT 10]){
            cLddList.add(new cLdd(l));
        }
    }



    public String getNumberToWords(){
        return NumberToSpanishWords.toSpanishWords( total );
    }


    public class cFactura{
        public Factura__c fct{get; set;}
        public String ST_Exentas{get;set;}
        public String ST_Gravadas_IVA10{get;set;}
        public String Total_a_Pagar{get;set;}
        public String IVA_10{get;set;}
        public String Descuento{get;set;}

        public cFactura(Factura__c f){
            this.fct = f;
            this.ST_Exentas = NumberToSpanishWords.convertToEU(f.Pre_Factura__r.ST_Exentas__c);
            this.ST_Gravadas_IVA10 = NumberToSpanishWords.convertToEU(f.Pre_Factura__r.ST_Gravadas_IVA10__c);
            this.Total_a_Pagar = NumberToSpanishWords.convertToEU(f.Pre_Factura__r.Total_a_Pagar__c);
            this.IVA_10 = NumberToSpanishWords.convertToEU(f.Pre_Factura__r.IVA_10__c);
            this.Descuento = NumberToSpanishWords.convertToEU(f.Pre_Factura__r.Descuento__c);
        }
    }
    
    
    public class xOT{ //valores que se usa para la OT personalizada
        public OT__c ots{get; set;}
        public string cantper1 {get; set;}
        public string cantper2 {get; set;}
        public string cantper3 {get; set;}
        public string cantper4 {get; set;}
        public string cantper5 {get; set;}
        public string precio1 {get; set;}
        public string precio2 {get; set;}
        public string precio3 {get; set;}
        public string precio4 {get; set;}
        public string precio5 {get; set;}
        public string totalexenta1 {get; set;}
        public string totalexenta2 {get; set;}
        public string totalexenta3 {get; set;}
        public string totalexenta4 {get; set;}
        public string totalexenta5 {get; set;}
        public string totalgravada1 {get; set;}
        public string totalgravada2 {get; set;}
        public string totalgravada3 {get; set;}
        public string totalgravada4 {get; set;}
        public string totalgravada5 {get; set;}
        
        
        public xOT(OT__c ot2) {
            this.ots=ot2;
            this.cantper1= NumberToSpanishWords.convertToEU(ot2.Cant_1__c);            
            this.cantper2= NumberToSpanishWords.convertToEU(ot2.Cant_2__c);
            this.cantper3= NumberToSpanishWords.convertToEU(ot2.Cant_3__c);
            this.cantper4= NumberToSpanishWords.convertToEU(ot2.Cant_4__c);
            this.cantper5= NumberToSpanishWords.convertToEU(ot2.Cant_5__c);
            this.precio1=NumberToSpanishWords.convertToEU(ot2.Precio_Unit_1__c);
            this.precio2=NumberToSpanishWords.convertToEU(ot2.Precio_Unit_2__c);
            this.precio3=NumberToSpanishWords.convertToEU(ot2.Precio_Unit_3__c);
            this.precio4=NumberToSpanishWords.convertToEU(ot2.Precio_Unit_4__c);
            this.precio5=NumberToSpanishWords.convertToEU(ot2.Precio_Unit_5__c);
            this.totalexenta1=NumberToSpanishWords.convertToEU(ot2.Total_Ex_1__c);
            this.totalexenta2=NumberToSpanishWords.convertToEU(ot2.Total_Ex_2__c);
            this.totalexenta3=NumberToSpanishWords.convertToEU(ot2.Total_Ex_3__c);
            this.totalexenta4=NumberToSpanishWords.convertToEU(ot2.Total_Ex_4__c);
            this.totalexenta5=NumberToSpanishWords.convertToEU(ot2.Total_Ex_5__c);
            this.totalgravada1=NumberToSpanishWords.convertToEU(ot2.Total_Gra_1__c);
            this.totalgravada2=NumberToSpanishWords.convertToEU(ot2.Total_Gra_2__c);
            this.totalgravada3=NumberToSpanishWords.convertToEU(ot2.Total_Gra_3__c);
            this.totalgravada4=NumberToSpanishWords.convertToEU(ot2.Total_Gra_4__c);
            this.totalgravada5=NumberToSpanishWords.convertToEU(ot2.Total_Gra_5__c);
     }
     
    }       
            
    public class cOT{ //valores que se usa para cuando la Pre_Factura tiene mas de una OT
        public OT__c OT{get; set;}
        public String Sub_Total{get;set;}
        public String Exentas_2{get;set;}
        public String Gravadas_IVA_10_2{get;set;}

        public cOT(OT__c o){
            this.OT = o;
            this.Sub_Total = NumberToSpanishWords.convertToEU(o.Sub_Total__c);
            this.Exentas_2 = NumberToSpanishWords.convertToEU(o.Exentas_2__c);
            this.Gravadas_IVA_10_2 = NumberToSpanishWords.convertToEU(o.Gravadas_IVA_10_2__c);
            
        } 
    }

    public class cLdd{
        public Linea_de_detalle__c LDD{get; set;}
        public String P_Unit_Linea{get;set;}
        public String Total_Exentas{get;set;}
        public String Total_Gravadas_IVA_10{get;set;}

        public cLdd(Linea_de_detalle__c l){
            this.LDD = l;
            this.P_Unit_Linea = NumberToSpanishWords.convertToEU(l.P_Unit_Linea__c);
            this.Total_Exentas = NumberToSpanishWords.convertToEU(l.Total_Exentas__c);
            this.Total_Gravadas_IVA_10 = NumberToSpanishWords.convertToEU(l.Total_Gravadas_IVA_10__c);
        }
    }
}