content: import random
  import unittest
  from unittest.mock import patch
  
  from pyecharts import options as opts
  from pyecharts.charts import HeatMap
  from pyecharts.faker import Faker
  
  
  class TestHeatmapChart(unittest.TestCase):
      @patch("pyecharts.render.engine.write_utf8_html_file")
      def test_heatmap_base(self, fake_writer):
          value = [[i, j, random.randint(0, 50)] for i in range(24) for j in range(7)]
          c = (
              HeatMap()
              .add_xaxis(Faker.clock)
              .add_yaxis("series0", Faker.week, value)
              .set_global_opts(visualmap_opts=opts.VisualMapOpts())
          )
          c.render()
          _, content = fake_writer.call_args[0]
          self.assertEqual(c.theme, "white")
          self.assertEqual(c.renderer, "canvas")
  