code: def test_getitem_idx(self):
      x = cupy.arange(24).reshape((2, 3, 4)).astype("i")
      y = cupy.empty_like(x)
      y = cupy.ElementwiseKernel(
          "raw T x",
          "int32 y",
          "ptrdiff_t idx[] = {i / 12, i / 4 % 3, i % 4}; y = x[idx]",
          "test_carray_getitem_idx",
      )(x, y)
      testing.assert_array_equal(y, x)
  
file_path: cupy/tests/cupy_tests/core_tests/test_carray.py
imports: import unittest
  import cupy
  from cupy import testing
label_desc: Use image node_id 5 for calling the TestCArray obj's underlying member method code with example usage: obj.test_getitem_idx() without return types