code: def test_text(self):
      # TODO test that the right type of object is produced?
      title_block = Title("timestep {num}", num=[1, 2])
  
      ax = plt.gca()
      assert ax.get_title() == "timestep 1"
      title_block._update(1)
      assert ax.get_title() == "timestep 2"
      plt.close("all")
  
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 8 for calling the TestTitleBlock obj's underlying member method code with example usage: obj.test_text() without return types