Test class Invocable Method calling @future class to send email with VF attachment

Invoked from process builder with 100% coverage
public class ProcessHandler {
    public class NPS{
        @InvocableVariable(required=true)
        public Id npsid;
        @InvocableVariable(required=true)
        public String mname;
        @InvocableVariable(required=true)
        public String oname;
        @InvocableVariable(required=true)
        public String subject;
        @InvocableVariable(required=true)
        public String client;
        @InvocableVariable(required=true)
        public String md;
        @InvocableVariable(required=true)
        public String body;
    }
    @InvocableMethod
   public static void invokeapexcallout(NPS[] nps) {
     Futureapexcallout.apexcallout(nps[0].mname, nps[0].oname, nps[0].npsid, nps[0].subject, nps[0].client,nps[0].md,nps[0].body);
    }
}

@Future Method with only 26% coverage
public class Futureapexcallout{
  @future(Callout=true)
  public static void apexcallout(string mname,string oname,Id NPSId, String subject, String client, string md, string body){
        pageReference pdfPage = Page.NPS_Survey;
        pdfPage.getParameters().put('id',NPSID);
        if(Test.isRunningTest()){
        blob b = blob.valueOf('Unit.Test');
        }else{
        blob b = pdfpage.getContentaspdf(); 
        Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage();
        Messaging.EmailFileAttachment efa1 = new Messaging.EmailFileAttachment();
        efa1.setFileName('NPS.pdf');
        efa1.setBody(b);
        String addresses;
        email.setSubject(subject);
        email.setToAddresses(new List<String> {mname});
        email.setCCAddresses(new List<String> {oname});
        email.setPlainTextBody(body);
        email.setFileAttachments(new Messaging.EmailFileAttachment[] {efa1});
        Messaging.SendEmailResult [] r = Messaging.sendEmail(new Messaging.SingleEmailMessage[] {email});
    }
}
}

Test Class, probably really badly written :)
@isTest
private class testProcessHandler
{
private static testMethod void testProcessHandler() {
    test.startTest();
        User u2 = new User(Alias = 'nUr32', Email='newuser@testorg32.com', 
        EmailEncodingKey='UTF-8', LastName='Testing12', LanguageLocaleKey='en_US', 
        LocaleSidKey='en_US', ProfileId = '00e90000001yvFD' , 
        TimeZoneSidKey='America/Los_Angeles', UserName='newuser32@testorg.com',External_Use__c='SRK1132AA',Operating_Country__c='Global',Region__c='Global' ,Team__c='Client Services - Global');
        insert u2;
        Account a = new Account(Name = 'Test A',
        BillingCountry = 'UK',
        Ownership_Type__c = 'Private',
        Phone = '07826533392',
        Industry = 'Property development & management',
        Type = 'Customer Direct');
        insert a;
        Contact c = new Contact (FirstName='Test', LastName='Test', AccountId = a.Id,
        Phone = '07826533392');
        insert c;    
        Net_Promoter__c n = new Net_Promoter__c (Account__c=a.Id,
        Assigned_To__c=u2.id,
        Client_Visiting__c=c.id,
        Activity_Date__c = datetime.newInstance(2017, 9, 15, 12, 30, 0),
        End_Time__c=datetime.newInstance(2017, 9, 15, 14, 30, 0),
        Site_Location__c='Test'                                                                                   
        );
        insert n;
        n.Survey_Status__c='Complete';
        n.Score_Updated__c=TRUE;
        update n;
        List<ProcessHandler.NPS> Params = new List<ProcessHandler.NPS>();
        ProcessHandler.NPS p = new ProcessHandler.NPS();
        p.npsid = n.id;
        p.mname = n.MD_Name__c;
        p.oname = n.Ops_Director__c;
        p.subject = n.subject__c;
        p.client = n.client_visiting__r.FirstName;      
        p.md = n.MD_Email__c;
        p.body = n.Body__c; 
        Params.add(p);
        ProcessHandler.Invokeapexcallout(params);
        Futureapexcallout.apexcallout(n.MD_Name__c, n.Ops_Director__c, n.id, n.subject__c,n.client_visiting__r.FirstName, n.MD_Name__c, N.Body__c );
        Integer invocations = Limits.getEmailInvocations();
        pageReference pdfPage = Page.NPS_Survey;
        pdfPage.getParameters().put('id',n.id);
        if(Test.isRunningTest()){
        blob b = blob.valueOf('Unit.Test');
        }else{
        blob b = pdfpage.getContentaspdf(); 
        Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage();
        Messaging.EmailFileAttachment efa1 = new Messaging.EmailFileAttachment();
        efa1.setFileName('NPS.pdf');
        String addresses;
        email.setSubject(n.subject__c);
        email.setToAddresses(new List<String> {n.MD_Name__c});
        email.setCCAddresses(new List<String> {n.Ops_Director__c});
        email.setPlainTextBody(N.Body__c);
        email.setFileAttachments(new Messaging.EmailFileAttachment[] {efa1});
        Messaging.SendEmailResult [] r = Messaging.sendEmail(new Messaging.SingleEmailMessage[] {email});
        test.stopTest();
        system.assertEquals(p.npsid, n.id);       
        system.assertEquals(1, invocations, '1 email should be sent');
}           
}
}