code: def test_repr(self):
      transform = CropHeight(min_pixels=2, max_pixels=10)
      repr_str = transform.__repr__()
      self.assertEqual(
          repr_str, "CropHeight(min_pixels = 2, " "max_pixels = 10)"
      )
  
imports: import copy
  import unittest
  import numpy
  from parameterized import parameterized
  from mmocr.datasets.transforms import CropHeight, ImageContentJitter, PadToWidth, PyramidRescale, RescaleToHeight, ReversePixels, TextRecogGeneralAug
label_desc: Use image node_id 4 for calling the TestCropHeight obj's underlying member method code with example usage: obj.test_repr() without return types