code: def test_ellipse():
      p = (
          ggplot(data, aes("x", "y"))
          + geom_point()
          + stat_ellipse(type="t")
          + stat_ellipse(type="norm", color="red")
          + stat_ellipse(type="euclid", color="blue")
      )
  
      assert p == "ellipse"
  
imports: import numpy
  import numpy.testing
  import pandas
  from plotnine import aes, geom_point, ggplot, stat_ellipse
  from plotnine.stats.stat_ellipse import cov_trob
label_desc: Use image node_id 1 for calling a global function with example usage: test_ellipse() without return types