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public with sharing class SFLoginCtrlr {
    public static HTTPResponse getResp(String loginCred){
        Map<String, Object> mapLoginCred = (Map<String, Object>)JSON.deserializeUnTyped(loginCred);
        String username = ''+mapLoginCred.get('username');
        String password = ''+mapLoginCred.get('password');
        HttpRequest req = new HttpRequest();
        req.setMethod('POST');
        req.setTimeout(60000);
        req.setEndpoint('https://www.salesforce.com/services/Soap/u/29.0');
        req.setHeader('Content-Type', 'text/xml;charset=UTF-8');
        req.setHeader('SOAPAction', '""');
        req.setBody('<Envelope xmlns="http://schemas.xmlsoap.org/soap/envelope/"><Header/><Body><login xmlns="urn:partner.soap.sforce.com"><username>' +username+ '</username><password>' + password + '</password></login></Body></Envelope>');
        HttpResponse res = new Http().send(req);
        return res;
    }
}

@isTest
global class ExampleCalloutMock implements HttpCalloutMock{
  global HttpResponse respond(HTTPRequest req){
    HttpResponse res = new HttpResponse();
    res.setStatus('OK');
    res.setStatusCode(200);
    res.setBody('SUCCESS');
    return res;
  }
}

@isTest
private class SFLoginCtrlrTest{
    static testMethod void SFLoginCtrlrTestMethod(){
        Test.startTest();

        Test.setMock(HttpCalloutMock.class, new ExampleCalloutMock());

        Map<String, String> logincred = new Map<String, String>();
        logincred.put('username', 'dummy@user.com');
        logincred.put('password', 'notapassword');

        SFLoginCtrlr.getResp(JSON.serialize(logincred));

        Test.stopTest();
    }
}