code: def test_cast_with_symbolic_value(self):
      input_shape = [get_new_symbol(), 1]
      input_placeholders = {
          "x": mb.placeholder(shape=input_shape),
      }
  
      def build(x):
          shape = mb.shape(x=x)
          return mb.cast(x=shape, dtype="int32")
  
      with Function(input_placeholders) as ssa_func:
          output_vars = build(**ssa_func.inputs)
          assert is_compatible_symbolic_vector(
              output_vars.sym_val, [get_new_symbol(), 1]
          )
  
imports: import itertools
  import numpy
  import pytest
  import scipy
  from coremltools.converters.mil.mil import Builder
  from coremltools.converters.mil.mil import Function, get_new_symbol, types
  from coremltools.converters.mil.mil.ops.tests.iOS14 import backends
  from coremltools.converters.mil.mil.ops.tests.testing_utils import run_compare_builder
  from coremltools.converters.mil.mil.types.symbolic import is_compatible_symbolic_vector
  from coremltools.converters.mil.testing_reqs import compute_units
  from coremltools.converters.mil.testing_utils import ssa_fn
label_desc: Use image node_id 27 for calling the TestElementwiseUnary obj's underlying member method code with example usage: obj.test_cast_with_symbolic_value() and returns: mb