code: def test_op_combine_input_var():
      from .. import combine
  
      x = C.input_variable(shape=(2))
      func = combine([x])
      value = [[1, 2]]
      res = func.eval({x: value})
  
      assert np.allclose(res, [[1, 2]])
  
file_path: CNTK/bindings/python/cntk/ops/tests/combine_test.py
imports: from __future__ import division
  import numpy
  import pytest
  import cntk
  from .ops_test_utils import AA, precision, PRECISION_TO_TYPE, compare_lists_of_np_arrays, cntk_device
  from cntk.internal.utils import eval
  from cntk.internal import sanitize_dtype_cntk
  from ..None import plus, minus
  from cntk.losses import cross_entropy_with_softmax
  from cntk.metrics import classification_error
label_desc: Use image node_id 2 for calling a global function with example usage: test_op_combine_input_var() without return types