Filter test result collection with the cron job code defined in the config fixture. Set the schedule for every minute so that the job is scheduled regardless of the time when you run the test.

Author: evktalo

dev/tests/integration/testsuite/Magento/Cron/Observer/ProcessCronQueueObserverTest.php

@@ -27,14 +27,15 @@ protected function setUp()
     }
 
     /**
-     * @magentoConfigFixture current_store crontab/default/jobs/catalog_product_alert/schedule/cron_expr 8 * * * *
+     * @magentoConfigFixture current_store crontab/default/jobs/catalog_product_alert/schedule/cron_expr * * * * *
      */
     public function testDispatchScheduled()
     {
         $collection = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create(
             'Magento\Cron\Model\ResourceModel\Schedule\Collection'
         );
         $collection->addFieldToFilter('status', \Magento\Cron\Model\Schedule::STATUS_PENDING);
+        $collection->addFieldToFilter('job_code', 'catalog_product_alert');
         $this->assertGreaterThan(0, $collection->count(), 'Cron has failed to schedule tasks for itself for future.');
     }