Prevent error when calling run_pants_with_workdir

tests/python/pants_test/pants_run_integration_test.py

@@ -12,6 +12,7 @@
 from contextlib import contextmanager
 from dataclasses import dataclass
 from operator import eq, ne
+from pathlib import Path
 from threading import Lock
 from typing import Any, List, Optional, Union
 
@@ -327,6 +328,8 @@ def run_pants_with_workdir_without_waiting(self, command, workdir, config=None,
         ini.write(fp)
       args.append('--pants-config-files=' + ini_file_name)
 
+    Path('pyproject.toml').touch()
+
     pants_script = [sys.executable, '-m', 'pants']
 
     # Permit usage of shell=True and string-based commands to allow e.g. `./pants | head`.