MAGETWO-82003: Ensure database is cleared/Magento reinstalled when TESTS_CLEANUP is enabled magento#11499

 - Merge Pull Request magento#11499 from joshuaswarren/magento2:Integration-Test-Fix
 - Merged commits:
   1. bd95e4e

Author: Oleksii Korshenko

dev/tests/integration/framework/Magento/TestFramework/Application.php

@@ -438,7 +438,7 @@ public function cleanup()
      * @return void
      * @throws \Magento\Framework\Exception\LocalizedException
      */
-    public function install()
+    public function install($cleanup)
     {
         $dirs = \Magento\Framework\App\Bootstrap::INIT_PARAM_FILESYSTEM_DIR_PATHS;
         $this->_ensureDirExists($this->installDir);
@@ -453,8 +453,9 @@ public function install()
         $installParams = $this->getInstallCliParams();
 
         // performance optimization: restore DB from last good dump to make installation on top of it (much faster)
+        // do not restore from the database if the cleanup option is set to ensure we have a clean DB to test on
         $db = $this->getDbInstance();
-        if ($db->isDbDumpExists()) {
+        if ($db->isDbDumpExists() && !$cleanup) {
             $db->restoreFromDbDump();
         }
 

dev/tests/integration/framework/bootstrap.php

@@ -74,7 +74,7 @@
         $application->cleanup();
     }
     if (!$application->isInstalled()) {
-        $application->install();
+        $application->install($settings->getAsBoolean('TESTS_CLEANUP'));
     }
     $application->initialize([]);