def METHOD_NAME():
    code_gen = CythonCodeWrapper(CCodeGen())
    routine = make_routine('test', Eq(z, x + y + z))
    source = get_string(code_gen.dump_pyx, [routine])
    expected = (
        "cdef extern from 'file.h':\n"
        '    void test(double x, double y, double *z)\n'
        '\n'
        'def test_c(double x, double y, double z):\n'
        '\n'
        '    test(x, y, &z)\n'
        '    return z')
    assert source == expected