code: def test_setitem_field_no_storage(self):
      dtype = np.dtype(
          [
              ("position", np.float32, 3),
              ("texcoord", np.float32, 2),
              ("color", np.float32, 4),
          ]
      )
      data = np.zeros(10, dtype=dtype)
      B = DataBuffer(data)
      self.assertRaises(
          ValueError, B.__setitem__, "position", (1, 2, 3)
      )
  
imports: import unittest
  import numpy
  from vispy.testing import run_tests_if_main
  from vispy.gloo.buffer import Buffer, DataBuffer, DataBufferView, VertexBuffer, IndexBuffer
label_desc: Use image node_id 16 for calling the DataBufferTest obj's underlying member method code with example usage: obj.test_setitem_field_no_storage() without return types