code: def test_glsl_type(self):
      data = np.zeros((10,), np.float32)
      B = VertexBuffer(data)
      C = B[1:]
      assert B.glsl_type == ("attribute", "float")
      assert C.glsl_type == ("attribute", "float")
  
      data = np.zeros((10, 2), np.float32)
      B = VertexBuffer(data)
      C = B[1:]
      assert B.glsl_type == ("attribute", "vec2")
      assert C.glsl_type == ("attribute", "vec2")
  
      data = np.zeros((10, 4), np.float32)
      B = VertexBuffer(data)
      C = B[1:]
      assert B.glsl_type == ("attribute", "vec4")
      assert C.glsl_type == ("attribute", "vec4")
  
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 3 for calling the VertexBufferTest obj's underlying member method code with example usage: obj.test_glsl_type() without return types