docstr: Test all the planner flags on a small array
          
code: def test_planner_flags(self):
      """Test all the planner flags on a small array"""
      in_shape = self.input_shapes["small_1d"]
      out_shape = self.output_shapes["small_1d"]
  
      axes = (0,)
      a, b = self.create_test_arrays(in_shape, out_shape)
  
      for each_flag in pyfftw.pyfftw._flag_dict:
          if each_flag == "FFTW_WISDOM_ONLY":
              continue
          fft, ifft = self.run_validate_fft(
              a, b, axes, flags=(each_flag,)
          )
  
          self.assertTrue(each_flag in fft.flags)
          self.assertTrue(each_flag in ifft.flags)
  
      # also, test no flags (which should still work)
      fft, ifft = self.run_validate_fft(a, b, axes, flags=())
  
imports: from pyfftw import FFTW, byte_align, empty_aligned, forget_wisdom
  import pyfftw
  import numpy
  from timeit import Timer
  import time
  import unittest
  from .test_pyfftw_base import FFTWBaseTest, run_test_suites, miss, np_fft
label_desc: Use image node_id 9 for calling the Complex64FFTW1DTest obj's underlying member method code with example usage: obj.test_planner_flags() without return types