code: def test_multiple_replacements(self):
      actual = Title(
          "timestep {num}, max density {n}", num=[1, 2], n=[500, 10]
      ).titles
      expected = [
          "timestep {num}, max density {n}".format(num=1, n=500),
          "timestep {num}, max density {n}".format(num=2, n=10),
      ]
      assert actual == expected
  
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 5 for calling the TestTitleBlock obj's underlying member method code with example usage: obj.test_multiple_replacements() without return types