code: def test_binary_function():
      x, y = symbols("x y")
      f = binary_function("f", x + y, backend="dummy")
      assert f._imp_() == str(x + y)
  
imports: import os
  import tempfile
  import shutil
  from io import StringIO
  from sympy.core import symbols, Eq
  from sympy.utilities.autowrap import autowrap, binary_function, CythonCodeWrapper, UfuncifyCodeWrapper, CodeWrapper
  from sympy.utilities.codegen import CCodeGen, C99CodeGen, CodeGenArgumentListError, make_routine
  from sympy.testing.pytest import raises
  from sympy.testing.tmpfiles import TmpFileManager
label_desc: Use image node_id 11 for calling a global function with example usage: test_binary_function() without return types