System.QueryException: List has no rows for assignment to SObject

public class MyAccountListCntrlr {


     // PROPERTIES
      public String subject { get; set; }
      public String body { get; set; }
      public string ccaddress{set;get;}
      public string bccaddress{set;get;}
  
     public List<ContactWrapperCls> acctList {get;set;}
     public List<String> selAccountNames{get;set;}
     public Boolean hasSelAcct {get;set;}
     public final Deal__c opp;
     public task t = new task();
     // CONSTRUCTOR
     public MyAccountListCntrlr(ApexPages.StandardController controller){
          acctList = new List<ContactWrapperCls>();
          selAccountNames= new List<String>();
          opp = [SELECT Name,id,Account__c FROM Deal__c
                   WHERE Id = :ApexPages.currentPage().getParameters().get('id')];
                   system.debug('opportunity@@@@@@@@@@'+opp);                  

        for(Contact a : [SELECT Name,id,Email,Account.Name,Account.Id FROM Contact where Account.id=:opp.Account__c ]){
               acctList.add(new ContactWrapperCls(a));
            Account acc=[Select Id,BillingStreet,BillingCity,Billingstate,BillingPostalcode,BillingCountry from Account where id=:opp.Account__c];
           
          } 

     }

     // METHODS
     public void displaySelectedAccountNumbers(){
          selAccountNames.clear();
          hasSelAcct = false;
          for(ContactWrapperCls cWrapper : acctList){
               if(cWrapper.isSelected){
                    hasSelAcct = true;
                    selAccountNames.add(cWrapper.cContact.Email);
               }
          }
     }
   
      public PageReference send() {
     
     // Define the email 
        Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage(); 
        
     // Reference the attachment page and pass in the OpportunityID
        PageReference pdf =  Page.Quotation;
        pdf.getParameters().put('id',(String)opp.id); 
        pdf.setRedirect(true);

     // Take the PDF content
            Blob b = pdf.getContent();
            Attachment myAttach = new Attachment();
            myAttach.ParentId = ApexPages.currentPage().getParameters().get('id');
            System.debug('Id: ' + ApexPages.currentPage().getParameters().get('id'));
            List<Attachment> at=[Select id from Attachment where parentId=:myAttach.ParentId];
            Integer c=at.size()+1;
            myAttach.name =opp.Name +''+ 'License Version' + c +'.pdf';
            myAttach.body = b;
            insert myAttach;
           

     // Create the email attachment
        Messaging.EmailFileAttachment efa = new Messaging.EmailFileAttachment();
        efa.setFileName(myAttach.name);
        efa.setBody(b);

        String[] ccAddresses = new String[] {ccaddress};
        String[] bccAddresses = new String[] {'emailtosalesforce@28wj1f7u1jx4d0rk7syg098pe8grkt8ir75tm5j0vhveterlrr.z-87epmai.z.le.sandbox.salesforce.com'};
        String addresses;
     /*   if (con[0].Email != null) {
       
            address = con[0].Email;
            // Loop through the whole list of contacts and their emails 
    
            for (Integer i = 1; i <con.size(); i++) {
                if (con[i].Email != null) {
                    address += ':' + con[i].Email;
                }
            }
        }*/
      //  addresses = con.Email;
        String[] toAddresses = selAccountNames;
        
       
        
    
     // Sets the paramaters of the email 
        email.setSubject( subject );
        email.setToAddresses( toAddresses );
            
    string UserId = UserInfo.getUserId();
    User user = [select email, IsActive from User where id = :UserId];
        

        
     //email.setCcAddresses(toAddresses);
     //email.setBccAddresses(bccaddress);
        email.setReplyTo(user.email);
        email.setBccSender(true);
        email.setHtmlBody(body);
        email.setSenderDisplayName('Salesforce');
        email.setFileAttachments(new Messaging.EmailFileAttachment[] {efa}); 
        
        // Sends the email 
        Messaging.SendEmailResult [] r = Messaging.sendEmail(new Messaging.SingleEmailMessage[] {email});

        t.subject ='Email:'+myAttach.name+ subject;
        t.status = 'Completed';
        t.description = body;
        t.type =  'Email';
        t.ActivityDate = System.today();
        t.Whatid=opp.id;

        insert t;
            
        //PageReference pr = new PageReference('/' + ApexPages.currentPage().getParameters().get('id') +'#'+ ApexPages.currentPage().getParameters().get('id') + '_RelatedNoteList_target');
        PageReference pr = new PageReference('/'+ ApexPages.currentPage().getParameters().get('id'));
      
        pr.setRedirect(true);
      
        System.debug('Inside back');
        return pr;
        return null;
       }

public class ContactWrapperCls {
     public Boolean isSelected {get;set;}
     public Contact cContact {get;set;}

     public ContactWrapperCls(Contact cContact){
          this.cContact = cContact;
     }
}
private static testMethod void myUnitTest() {
/*
  Account acc=new Account(Name='rose',BillingCity='bang',Billingstate='kat',BillingPostalcode='560000',BillingCountry='india');
        insert acc;
         system.debug('########555'+ acc);
        Deal__c opp=new Deal__c(Name='test12',Account__c=acc.id);
        insert opp;
        system.debug('########7765'+ opp);
     
    Contact con =  new Contact();
    con.FirstName = 'Anil';
    con.LastName = 'Dutt';
    con.Email = 'anil@swiftsetup.com';
    insert con;


    Deal__c oppNew =  new Deal__c();
    oppNew.Name = 'Test Opp';
    oppNew.Stage__c = 'Business Case';
   
    insert oppNew;
     Attachment myAttach1 = new Attachment();
        myAttach1.ParentId =opp.id;
        myAttach1.name = 'Quotation.pdf';
        myAttach1.body = blob.valueof('test');
          
        
        
        
        system.debug('Attahment1'+ myAttach1);
     
        AttachController atc = new AttachController(new ApexPages.StandardController(opp));
        system.debug('%%%%%'+atc);
        PageReference pageRef = Page.Quotation;
        pageRef.getParameters().put('id', String.valueOf(opp.Id));
        Test.setCurrentPage(pageRef);
       Blob b;
       Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage(); 
     
       task t=new task();
       
       


}
}*/
    Deal__c d=new Deal__c();
       d = [select Id from Deal__c limit 1];
     PageReference ParentPage = new PageReference('/' + d.Id);  
      PageReference pdf =  Page.Quotation;
       Test.setCurrentPageReference(pdf);
        
        Test.startTest();
         ApexPages.StandardController sc = new ApexPages.standardController(d);
         MyAccountListCntrlr mySendEmailController =new MyAccountListCntrlr(sc);
          PageReference testPage1 = new PageReference('/apex/Quotation' + '?id=' + d.Id);
        ApexPages.currentPage().getParameters().put('Id',d.Id);
        //mySendEmailController.setccaddress('arup.sarkar@nb.com');
        //String get_ccaddress = mySendEmailController.getCC();
        // PageReference findContacts = mySendEmailController.findContacts();        
        //List<selectOption> items = mySendEmailController.getItems();
        //String testContacts = mySendEmailController.getSelectedContacts();
         Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage(); 
      Messaging.SendEmailResult [] r = Messaging.sendEmail(new Messaging.SingleEmailMessage[] {email});
       // PageReference send_email_page = mySendEmailController.SendEmail();
        //System.assertEquals(send_email_page.getURL(), ParentPage.getURL());
        
        
        Test.stopTest();       
       }}

You are getting List has no rows for assignment to SObject on which line.Can you post the exact error message.

As you can see in code at first i want to get coverage on the mentioned below

 public String subject { get; set; }
      public String body { get; set; }
      public string ccaddress{set;get;}
      public string bccaddress{set;get;}
  
     public List<ContactWrapperCls> acctList {get;set;}
     public List<String> selAccountNames{get;set;}
     public Boolean hasSelAcct {get;set;}

Please help me on this.

As of now im not getting any test coverage. please help me how to start.