code: def test_init_view(self):
      data = np.zeros(10)
      B = DataBuffer(data=data)
  
      V = DataBufferView(B, 1)
      assert V.size == 1
  
      V = DataBufferView(B, slice(0, 5))
      assert V.size == 5
  
      V = DataBufferView(B, slice(5, 0))
      assert V.size == 5
  
      V = DataBufferView(B, Ellipsis)
      assert V.size == 10
  
      self.assertRaises(TypeError, DataBufferView, B, [])
      self.assertRaises(ValueError, DataBufferView, B, slice(0, 10, 2))
  
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 1 for calling the DataBufferViewTest obj's underlying member method code with example usage: obj.test_init_view() without return types