code: def test_update(self):
      x = np.linspace(0, 1, 10)
      t = np.linspace(0, 1, 5)
      x_grid, t_grid = np.meshgrid(x, t)
      y_data = np.sin(2 * np.pi * (x_grid + t_grid))
  
      line_block = amp.blocks.Line(x_grid, y_data)
      line_block._update(frame=1)
  
      npt.assert_equal(line_block.line.get_xdata(), x)
      npt.assert_equal(line_block.line.get_ydata(), y_data[1, :])
  
imports: from matplotlib.testing import setup
  import numpy
  import numpy.testing
  import matplotlib.pyplot
  import matplotlib
  import packaging.version
  import pytest
  import animatplot
  from tests.tools import animation_compare
  from animatplot.blocks import Block, Title
label_desc: Use image node_id 2 for calling the TestLineBlock obj's underlying member method code with example usage: obj.test_update() without return types