Add stop calls to avoid problems if more tests are added.

module/VuFind/tests/integration-tests/src/VuFindTest/Mink/AdvancedSearchTest.php

@@ -103,5 +103,7 @@ class AdvancedSearchTest extends \VuFindTest\Unit\MinkTestCase
         $this->assertEquals('Title', $page->findById('search_type0_1')->getValue());
         $this->assertEquals('1883',  $page->findById('search_lookfor0_2')->getValue());
         $this->assertEquals('year',  $page->findById('search_type0_2')->getValue());
+
+        $session->stop();
     }
 }

module/VuFind/tests/integration-tests/src/VuFindTest/Mink/BasicTest.php

@@ -50,5 +50,6 @@ class BasicTest extends \VuFindTest\Unit\MinkTestCase
         $session->visit($this->getVuFindUrl());
         $this->assertEquals(200, $session->getStatusCode());
         $this->assertTrue(false !== strstr($session->getPage()->getContent(), 'VuFind'));
+        $session->stop();
     }
 }