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Nitesh TrivediNitesh Trivedi 

can any one help me to write the test class of below code

public class IncludeDocumentController {
    //public blob attach{get;set;}
    public integer displayOrder{get;set;}
    public Additional_Document__c addattach{get;set;}
    public string recordId{get;set;}
    public string quoteNum{get;set;}
    public Quote quotes{get;set;}
    public list<Quote> listquote{get;set;}
    public Attachment myfile;
    ApexPages.StandardController sc;
   
    //includedocment controller
    public IncludeDocumentController(ApexPages.StandardController sc){
        this.sc = sc;
        listquote=new list<Quote>();
        recordId=ApexPages.CurrentPage().getparameters().get('id');
        for(Quote q:[select id,QuoteNumber from Quote where id=:recordId]){
            quoteNum=q.QuoteNumber;
        }
    }
    //get attched file
    Public Attachment getmyfile()
    {
        myfile = new Attachment();
        return myfile;
    }
    
    // method to save file and redirect to quote page
    public pageReference save(){
        Attachment a = new Attachment(parentId = recordId, name=myfile.name, body = myfile.body);
        /*addattach=new Additional_Document__c();
        addattach.Name=myfile.name;
        addattach.External_Id__c=a.id;
        if(displayOrder!=null){
        addattach.Display_Order__c=displayOrder;
        }
        addattach.Quote__c=recordId;*/
        try {
            insert a;
            addattach=new Additional_Document__c();
            addattach.Name=myfile.name;
            addattach.External_Id__c=a.id;
            if(displayOrder!=null){
            addattach.Display_Order__c=displayOrder;
            }
            addattach.Quote__c=recordId;
            insert addattach;
        }
        catch (DMLException e) {
            ApexPages.addMessage(new ApexPages.message(ApexPages.severity.ERROR,'Error uploading attachment'));
        }
        pageReference pr = new PageReference('/' + recordId );
        pr.setRedirect(true);
        if(myfile!=null){
        return pr;  
        }else{
               ApexPages.addMessage(new ApexPages.message(ApexPages.severity.ERROR,'Please Attach File'));
        }
        return null;
    }
    
   //cancel method to redirect to quote page
    public pageReference cancel(){
        pageReference pr = new PageReference('/' + recordId );
        pr.setRedirect(true);
        return pr;
    }
   /* //importline page import button method
     public pageReference importLine(){
        pageReference pr = new PageReference('/' + recordId );
        pr.setRedirect(true);
        return pr;

     }*/
}
SwethaSwetha (Salesforce Developers) 
HI Nitesh,
The below articles give a good insight into how to begin writing test class and how coverage can be improved

https://salesforce.stackexchange.com/questions/244788/how-do-i-write-an-apex-unit-test
https://salesforce.stackexchange.com/questions/244794/how-do-i-increase-my-code-coverage-or-why-cant-i-cover-these-lines 

Examples: https://developer.salesforce.com/forums/?id=9060G000000XiuOQAS 
https://salesforce.stackexchange.com/questions/138569/unit-test-for-attachment-upload-vf-page

Hope this helps you. Please mark this answer as best so that others facing the same issue will find this information useful. Thank you