code: def test_send_file(self) -> None:
      task = RuntimeTask("send-file-task")
      task.send_file("./test.txt")
      assert len(task._task_steps) == 1
      assert (
          task._task_steps[0].type
          == RuntimeTask._TaskStep.TYPE_SEND_FILE
      )
  
file_path: lazycluster/tests/test_runtime_task.py
imports: import pytest
  from lazycluster import RuntimeTask
label_desc: Use image node_id 5 for calling the TestRuntimeTask obj's underlying member method code with example usage: obj.test_send_file() without return types