Creating a Test Class for 2 Classes [duplicate]

Question

In order for Territory Assignment rules to fire on Account creation and Update, I have got 2 Classes working (with Triggers), however I am struggling to create a Test class for these, any help would be greatly appreciated.

Class that calls the queueable callout:

public class RunTerritoryRulesCallout {

    public static void RunTerritoryRulesCallout(List<Account> AccsToUpdate){

        //run ETM assignment rules
        Map<ID, Account> AcctMap = new Map<ID, Account>(AccsToUpdate);
        Set<String> AccIDs = new Set<String>((List<String>) New List<ID>(AcctMap.keyset()));


        if(!System.isQueueable()){              
            RunTerritoryRules Job = new RunTerritoryRules();
                Job.accntIds = AccIDs;                
                    System.debug('Queuing ETM assignments');
                System.enqueueJob(job);
        }       
}   
}

The callout class:

public class RunTerritoryRules implements Queueable, Database.AllowsCallouts  {
public Set<String> accntIds = null;
private String sessionId = null;    
public void execute(QueueableContext context) {
sessionId = Page.GetSessionId.getContent().toString();     
    List<String> lstAccString = new List<String>();
    if(accntIds != null){
        for(String accId:accntIds){
            lstAccString.add(accountTag.replace('{ACCID}', accId)); 
        }
    } 
    requestTemplate = requestTemplate.replace('{ACCLISTS}', String.join(lstAccString, ' ')) ;
    requestTemplate = requestTemplate.replace('{SESSID}', sessionId) ;        
    HttpRequest request = new HttpRequest();
request.setEndpoint(System.URL.getSalesforceBaseUrl().toExternalForm()+
            '/services/Soap/u/41.0/'+UserInfo.getOrganizationId());
    request.setMethod('POST');
    request.setHeader('Content-Type', 'text/xml;charset=UTF-8');
request.setHeader('SOAPAction', '""');
    request.setBody(requestTemplate);
String s = String.valueOf(new Http().send(request).getBodyDocument());
    System.debug(s);
}
String accountTag = '<urn:sObjects> '+
                        '<urn1:type>Account</urn1:type>  '+
                '<urn1:Id>{ACCID}</urn1:Id>   '+
                    '</urn:sObjects> ' ;    
String requestTemplate = '<soapenv:Envelope '+
            'xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"'+
            ' xmlns:urn="urn:partner.soap.sforce.com"'+
            ' xmlns:urn1="urn:sobject.partner.soap.sforce.com">'+
                            '<soapenv:Header> '+
                              '<urn:AssignmentRuleHeader> '+ 
                                 '<urn:useDefaultRule>true</urn:useDefaultRule> '+
                                 '<urn:assignmentRuleId></urn:assignmentRuleId> '+
                              '</urn:AssignmentRuleHeader>  '+
                              '<urn:SessionHeader> '+
                    '<urn:sessionId>{SESSID}</urn:sessionId> '+
                              '</urn:SessionHeader> '+
                           '</soapenv:Header> '+
                           '<soapenv:Body> '+
                  '<urn:update> '+
                   ' {ACCLISTS}'+ 
                              '</urn:update> '+
                           '</soapenv:Body> '+
                        '</soapenv:Envelope>';}