Error:Failed asserting that two strings are equal

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PHP

Am installing xmlps software. Installation is done. When I try test, using this ./unittest.sh command.
Am getting a mentioned below error.
*****************************************************************************
root@gains [/home/quotequadsco/pkp/xmlps]# ./unittest.sh
PHPUnit 3.7.29 by Sebastian Bergmann.

Configuration read from /home/quotequadsco/pkp/xmlps/phpunit.xml

.................F

Time: 3.86 seconds, Memory: 42.25Mb

There was 1 failure:

1) ApiTest\Controller\ApiControllerTest::testSubmitAction
Failed asserting that two strings are identical.
--- Expected
+++ Actual
@@ @@
-error
+success

/home/quotequadsco/pkp/xmlps/module/Api/test/ApiTest/Controller/JobControllerTest.php:63

FAILURES!
Tests: 18, Assertions: 56, Failures: 1.

*****************************************************************************

JobControllerTest.php

<?php

namespace ApiTest\Controller;

use Api\Entity\Job;
use Xmlps\UnitTest\ControllerTest;

class ApiControllerTest extends ControllerTest
{
    protected $document;
    protected $job;
    protected $user;

    protected $testFile = '/tmp/UNITTEST_document.txt';

    protected $citationStyles;

    /**
     * Set up the controller test
     *
     * @return void
     */
    public function setUp()
    {
        parent::setUp();

        $this->citationStyles = $this->sm->get('CitationstyleConversion\Model\Citationstyles');

        $this->resetTestData();
    }

    /**
     * Test if the submit action canot be accessed by guests
     *
     * @return void
     */
    public function testSubmitActionCannotBeAccessedLoggedOut()
    {
        $this->dispatch($this->buildQuery('submit', array(), false));
        $this->assertResponseStatusCode(403);
    }

    /**
     * Test if a job can be submitted
     *
     * @return void
     */
    public function testSubmitAction()
    {
        $styleMap = $this->citationStyles->getStyleMap();
        $keys = array_keys($styleMap);

        $data = array(
            'fileName' => 'Testfile.txt',
            'fileContent' => base64_encode('Test Content'),
            'citationStyleHash' => $keys[0],
        );

        $this->dispatch($this->buildQuery('submit', $data));
        $this->assertResponseStatusCode(200);
        $response = json_decode($this->getResponse()->getContent());
        $this->assertTrue(is_object($response));
        $this->assertSame($response->status, 'success');
        $this->assertNotEmpty($response->id);
    }

How to fix this error. I searched a lot but dint get anything.