code: def setUp(self) -> None:
      img_path = "tests/data/WIDERFace/WIDER_train/0--Parade/0_Parade_marchingband_1_5.jpg"  # noqa: E501
      dummy_img = np.zeros((683, 1024, 3), dtype=np.uint8)
      cv2.imwrite(img_path, dummy_img)
  
file_path: mmdetection/tests/test_datasets/test_wider_face.py
imports: import unittest
  import cv2
  import numpy
  from mmdet.datasets import WIDERFaceDataset
label_desc: Use image node_id 1 for calling the TestWIDERFaceDataset obj's underlying member method code with example usage: obj.setUp() without return types