Hi,

I have two classes A and B. While writing the test class am able to get the code coverage of Class A. But I was stucked at Class B.
Please help on this. Am getting the error as List Has No Row to Assign for SObject at line numer 5 in class B.

Class A:

public with sharing class A {
    
    public string rid {get; set;}
    public Opportunity o {get;set;}
    public Account a {get; set;}
    public Contact c {get;set;}
    private ApexPages.StandardController standardController;
    public A(ApexPages.StandardController standardController)
    {
        rid = ApexPages.CurrentPage().getparameters().get('id');
        this.standardController = standardController; 
        try{
            o=[Select id,Name,AccountId,Nationality__c,Purpose_of_Loan__c,Sanction_Amount__c,Application_Creation_Date__c,Original_Face__c,Loan_Tenor_in_Month__c,Other_Loan_Purpose__c from Opportunity where id= :rid];
            a=[Select Id,Loan_Amount__c, Sector__c from Account where id = :o.AccountId];
            c=[Select Id,FirstName,LastName,Birthdate,Borrower_Type__c,Name_of_Firm_Company_Establishment_In__c,Gender__c,Age1__c,PAN_ID__c,Residence_Type__c, Phone, Annual_Income_Gross__c,Organisation__c,MailingStreet, MailingCity,MailingState, MailingCountry,MailingPostalCode,Marital_Status__c,Email,MobilePhone From Contact where AccountId = :a.Id]; 
        }catch(Exception e){
            o = new Opportunity();
            a = new Account();
            c = new Contact();
        }    
    }
    
    public PageReference method(){
        B b1 = new B(); // instantiate Class
        b1.B(rid);                               
        return null;
    }   
}


Class B:

Public class B{
    
    public void B(string rid){ 
        
        Opportunity o=[Select id,Name,AccountId,Nationality__c,Purpose_of_Loan__c,Sanction_Amount__c,Application_Creation_Date__c,Original_Face__c,Loan_Tenor_in_Month__c,Other_Loan_Purpose__c from Opportunity where id= :rid];
        system.debug('print me account id'+o.AccountId);
        Account a=[Select Id,Loan_Amount__c, Sector__c from Account where id = :o.AccountId];
        system.debug('Print me account id'+a.id);
        List<Contact> c=[Select Id,FirstName,LastName,Birthdate,Borrower_Type__c,Name_of_Firm_Company_Establishment_In__c,Gender__c,Age1__c,PAN_ID__c,Residence_Type__c, Phone, Annual_Income_Gross__c,Organisation__c,MailingStreet, MailingCity,MailingState, MailingCountry,MailingPostalCode,Marital_Status__c,Email,MobilePhone From Contact where AccountId = :a.Id]; 
        system.debug('Contact' + c);
   .
   .
.
.
.
.
.

}
}

Test Class:

@isTest
Public class AB_Test{

    Public static testMethod void testcase(){
        
     
        Opportunity opp = new Opportunity();
        opp.Name = 'Test';
        opp.StageName = 'Rejected';
        opp.Collateral_Type__c = 'Other';
        
        insert opp;
        
       String rid = opp.id;
       system.debug('-----'+rid);
        
        
        ApexPages.Standardcontroller sc = new ApexPages.Standardcontroller(opp);
        A hc = new A(sc);
        hc.method();
        
      B hc1 = new B();
      hc1.B(rid);
     
        
        
    }
}

Please help on this... Thanks in advance..