Utilizing Mongounit's trait to allow for mongo datasources in addition to mysql datasources.

mixed_resource_testcase.php

<?php

use \Zumba\PHPUnit\Extensions\Mongo\TestTrait as MongoTest;

class DatabaseTestCase extends \PHPUnit_Extensions_Database_TestCase {
  use MongoTest {
    MongoTest::setUp as mongoSetUp;
    MongoTest::tearDown as mongoTearDown;
  }
  
  public function setUp() {
    $this->mongoSetUp();
    parent::setUp();
  }

  public function tearDown() {
    $this->mongoTearDown();
    parent::tearDown();
  }

  public function getMongoConnection() {
    // Implement mongo connection here...
  }

  public function getMongoDataSet() {
    // Implement setting up fixture data here...
  }

}