code: def test_input_layer():
      layer = InputLayer([1, 2, 3])
      input_indexes = list(layer.input_indexes)
      assert input_indexes == [
          (0, 0, 0),
          (0, 0, 1),
          (0, 0, 2),
          (0, 1, 0),
          (0, 1, 1),
          (0, 1, 2),
      ]
  
imports: import numpy
  import pytest
  from omlt.neuralnet.layer import ConvLayer2D, DenseLayer, IndexMapper, InputLayer, PoolingLayer2D
label_desc: Use image node_id 1 for calling a global function with example usage: test_input_layer() without return types