Hi Guys,

I am getting this error for test class coverage.
I have used the below method for sendEmail while trying to call method then getting error.
Apex code:

public class sendEmailAttachmentPR {
    public Pricing_Reconfirmation__c prId{get;set;}
    public String primaryContactId {get;set;}
    public String AccountId{get;set;}
    public String sendToemail{get;set;}
    public string subject{get;set;}
    public string fileName{get;set;}
    public string contentType{get;set;}
    public string parentId{get;set;}
    public string attachmentId{get;set;}
    public blob bodyBlob{get;set;}
    public string messageBody{get;set;}
    public string contactId{get;set;}
    
    
    
    public sendEmailAttachmentPR(){
        
        prId = [Select Id,Name,Account__r.Id,Primary_Contact__r.id from Pricing_Reconfirmation__c where id =: ApexPages.currentPage().getParameters().get('id')];
        system.debug('Pricing Reconfirmation Id'+prId);
        primaryContactId = prId.Primary_Contact__r.id;
        AccountId = prId.Account__r.Id;
        system.debug('Primary Contact Id ====>'+primaryContactId);
        system.debug('Account Id ===> '+AccountId);
        
        Contact con = [SELECT ID,Name,Email,Phone from Contact where Id =:primaryContactId];
        sendToemail = con.email;
        contactId = con.Id;
        system.debug('Email Id  =======>'+sendToemail);
        User currentUser = [SELECT Id FROM User Where Id = :UserInfo.getUserId()];
        
        try{
        Attachment  attachFile = [SELECT Id,Name,parentId,LastmodifiedDate,ContentType,body FROM Attachment where parentId=:prId.Id ORDER BY LastmodifiedDate Desc LIMIT 1];
        system.debug('Attachment File Id '+attachFile.id);
        attachmentId = attachFile.Id;
          subject = 'Price Re-Confirmation Doc';
        fileName = attachFile.Name;
        contentType = attachFile.ContentType;
        parentId = attachFile.ParentId;
        bodyBlob = attachFile.body; 
        }
        catch (Exception e){
            ApexPages.Message msg=new ApexPages.Message(ApexPages.Severity.Error,'No attachment available for this record. Please reprice and generate the file.' );
            ApexPages.addMessage(msg);
        }
       
    }
    
    
    public pagereference sendEmailAttchament(){
        
        if(sendToemail !='' && sendToemail!= null){
             Messaging.EmailFileAttachment emailAttach = new Messaging.EmailFileAttachment();
            emailAttach.setContentType(contentType);
            system.debug('ContentType ====> '+contentType);
            emailAttach.setFileName(fileName);
            system.debug('FIle Name ===>'+fileName);
            emailAttach.setInline(false);
            emailAttach.Body = bodyBlob;
            system.debug('Body ====> '+bodyBlob);
        
        
            Messaging.SingleEmailMessage semail = new Messaging.SingleEmailMessage();
            semail.setEntityAttachments(new Id[]{attachmentId});
            semail.setSubject(subject);
            String[] sendTo = new String[]{sendToemail};
                semail.setToAddresses(sendTo);
            semail.setPlainTextBody(messageBody);
            Messaging.sendEmail(new Messaging.SingleEmailMessage[]{semail});
            system.debug('Mail sent successfully ');
            ApexPages.Message msg=new ApexPages.Message(ApexPages.Severity.CONFIRM,'Email Sent Successfully' );
            ApexPages.addMessage(msg);
            
            
        }
        else {
            ApexPages.Message msg1 = new ApexPages.Message(ApexPages.Severity.Error,'No Contact Email Id Available' );
            ApexPages.addMessage(msg1);
        }
            
        return null;
    }

}

Test Class:
@isTest
public class sendEmailAttachmentPRTest {
    
    
    public static string sendToEmail;
    public static String messageBody;
    public static string subject;
    public static string attachmentId;
    public static Blob bodyBlob;
    public static string fileName;
    public static string contentType;
    
    static testMethod void priceReconfirmationTest(){
     
        Account customer = new Account
            (
                Name = 'Test Customer Account ' + '1',
                ParentId = null,
                AccountCategory__c = 'Academia and Research',
                BillingCountryCode = 'SE',
                CustomerName2__c = 'ARBOR MEDICAL CORPORATION LT',
                CustomerName3__c = 'Test Customer Name 3',
                CustomerName4__c = 'Test Customer Name 4',
                SAPCRMAccountID__c = '1002126370 - SAPCRM',
                BEKeyword__c = 'ARBOR MEBE',
                BusinessEntityFirstPart__c = '605022299',
                CustomerType__c = 'Bill-To',
                Inactive__c = false,
                BillingStreet = 'BALTU PR.145',
                BillingPostalCode = '47125',
                BillingCity = 'KAUNAS',
                BillingCountry = 'sweden',
                Local_ID__c = 'Local_ID__c',
                TaxType__c = '432'
            );
        insert customer;
        
      
        
        Contact cont = new Contact();
        cont.FirstName = 'Sahshikant';
        cont.LastName = 'Pandey';
        cont.Email = 'Test@gmail.com';
        cont.Phone = '+91 7878787878';
        cont.AccountId = customer.Id;
        insert cont;
        
      
        Pricing_Reconfirmation__c pr = new Pricing_Reconfirmation__c();
        pr.Name= 'Test Price Reconfirmation';
        pr.Account__c = customer.Id;
        pr.Primary_Contact__c = cont.Id;
        insert pr;
        
        
        bodyBlob= Blob.valueOf('Unit Test Attachment Body');
        Attachment attach = new Attachment();
        attach.Name='Test attachment';
        attach.ContentType ='application/msword';
        attach.CreatedDate=system.today();
        attach.LastModifiedDate = system.today();
        attach.ParentId = pr.Id;
        attach.Body = bodyBlob;
        insert attach;
        
        List<Attachment> attachments = [SELECT Id,Name,body,LastModifiedDate FROM Attachment where parentId=:pr.Id ORDER BY LastmodifiedDate Desc LIMIT 1];
        
        ApexPages.currentPage().getParameters().put('id', pr.Id);
        messageBody = 'Test Body';
        sendToEmail = cont.Email;
        subject = 'Test Subject';
        attachmentId = attach.Id;
           fileName = attach.Name;
        contentType =attach.ContentType;
        sendEmailAttachmentPR semailpr = New sendEmailAttachmentPR();
        semailpr= new sendEmailAttachmentPR();
        semailpr.sendEmailAttchament();
          
    }
}

Could anyone help me out here to cover the test class method?
Thanks in advance!
Shashikant