code: def test_dtypes(self, dtype):
      # make sure that all input precisions are accepted and internally
      # converted to 64bit
      x = random(30).astype(dtype)
      assert_allclose(np.fft.ifft(np.fft.fft(x)), x, atol=1e-6)
      assert_allclose(np.fft.irfft(np.fft.rfft(x)), x, atol=1e-6)
  
imports: import numpy
  import pytest
  from numpy.random import random
  from numpy.testing import assert_array_equal, assert_raises, assert_allclose, IS_WASM
  import threading
  import queue
label_desc: Use image node_id 18 for calling the TestFFT1D obj's underlying member method code with example usage: obj.test_dtypes(dtype) without return types