code: def test_numbersymbol_c_code():
      routine = make_routine("test", pi**Catalan)
      code_gen = C89CodeGen()
      source = get_string(code_gen.dump_c, [routine])
      expected = (
          '#include "file.h"\n'
          "#include <math.h>\n"
          "double test() {\n"
          "   double test_result;\n"
          "   double const Catalan = %s;\n"
          "   test_result = pow(M_PI, Catalan);\n"
          "   return test_result;\n"
          "}\n"
      ) % Catalan.evalf(17)
      assert source == expected
  
imports: from io import StringIO
  from sympy.core import symbols, Eq, pi, Catalan, Lambda, Dummy
  from sympy.core.relational import Equality
  from sympy.core.symbol import Symbol
  from sympy.functions.special.error_functions import erf
  from sympy.integrals.integrals import Integral
  from sympy.matrices import Matrix, MatrixSymbol
  from sympy.utilities.codegen import codegen, make_routine, CCodeGen, C89CodeGen, C99CodeGen, InputArgument, CodeGenError, FCodeGen, CodeGenArgumentListError, OutputArgument, InOutArgument
  from sympy.testing.pytest import raises
  from sympy.utilities.lambdify import implemented_function
label_desc: Use image node_id 8 for calling a global function with example usage: test_numbersymbol_c_code() without return types