Fix build for no tables_prefix on travis change.

core/Db.php

@@ -338,7 +338,7 @@ class Db
             $tables = array($tables);
         }
 
-        return self::query("DROP TABLE " . implode(',', $tables));
+        return self::query("DROP TABLE `" . implode('`,`', $tables) . "`");
     }
 
     /**

tests/PHPUnit/IntegrationTestCase.php

@@ -1002,7 +1002,7 @@ abstract class IntegrationTestCase extends PHPUnit_Framework_TestCase
                 $rowsSql[] = "(" . implode(',', $values) . ")";
             }
 
-            $sql = "INSERT INTO $table VALUES " . implode(',', $rowsSql);
+            $sql = "INSERT INTO `$table` VALUES " . implode(',', $rowsSql);
             Db::query($sql, $bind);
         }
     }
@@ -1013,7 +1013,7 @@ abstract class IntegrationTestCase extends PHPUnit_Framework_TestCase
     public static function deleteArchiveTables()
     {
         foreach (ArchiveTableCreator::getTablesArchivesInstalled() as $table) {
-            Db::query("DROP TABLE IF EXISTS $table");
+            Db::query("DROP TABLE IF EXISTS `$table`");
         }
 
         ArchiveTableCreator::refreshTableList($forceReload = true);