code: def test_str(self):
      # Check something comes back from string representation
      img_klass = self.image_class
      # Assumes all possible images support int16
      # See https://github.com/nipy/nibabel/issues/58
      arr = np.arange(5, dtype=np.int16)
      img = img_klass(arr, np.eye(4))
      assert len(str(img)) > 0
      # Shape may be promoted to higher dimension, but may not reorder or
      # change size
      assert img.shape[:1] == (5,)
      assert np.prod(img.shape) == 5
      img = img_klass(np.zeros((2, 3, 4), dtype=np.int16), np.eye(4))
      assert len(str(img)) > 0
  
imports: from io import BytesIO
  import numpy
  import pytest
  from numpy.testing import assert_array_almost_equal
  from ..None import load
  from ..imageclasses import spatial_axes_first
  from ..spatialimages import HeaderDataError, SpatialHeader, SpatialImage
  from ..testing import bytesio_round_trip, expires, memmap_after_ufunc
  from ..tmpdirs import InTemporaryDirectory
label_desc: Use image node_id 9 for calling the TestSpatialImage obj's underlying member method code with example usage: obj.test_str() without return types