code: def test_conv3x3(self):
      conv = conv3x3(3, 6)
      self.assertEqual(conv.in_channels, 3)
      self.assertEqual(conv.out_channels, 6)
      self.assertEqual(conv.kernel_size, (3, 3))
  
file_path: mmocr/tests/test_models/test_textrecog/test_layers/test_conv_layer.py
imports: from unittest import TestCase
  import torch
  from mmocr.models.textrecog.layers.conv_layer import BasicBlock, Bottleneck, conv1x1, conv3x3
label_desc: Use image node_id 1 for calling the TestUtils obj's underlying member method code with example usage: obj.test_conv3x3() without return types