added missing exports

thanks @javiercasares

Author: pfefferle

.env.default

@@ -39,11 +39,11 @@ export WPT_PHP_EXECUTABLE=${WPT_PHP_EXECUTABLE-php}
 
 # (Optionally) define the PHPUnit command execution call.
 # Use if `php phpunit.phar` can't be called directly for some reason.
-WPT_PHPUNIT_CMD=
+export WPT_PHPUNIT_CMD=
 
 # (Optionally) define the command execution to remove the test directory
 # Use if `rm -r` can't be called directly for some reason.
-WPT_RM_TEST_DIR_CMD=
+export WPT_RM_TEST_DIR_CMD=
 
 # SSH connection string (can also be an alias).
 # Leave empty if tests are meant to run in the same environment.