Fix how we get the cwd for tests

Author: addshore

tests/bootstrap.php

@@ -4,7 +4,7 @@
 	die( 'Not an entry point' );
 }
 
-$pwd = exec( 'pwd' );
+$pwd = getcwd();
 chdir( __DIR__ . '/..' );
 passthru( 'composer update' );
 chdir( $pwd );