code: def test_is_filled_2d():
      # verify that the is_filled attribute is exposed by the following series
      x, y = symbols("x, y")
  
      expr = cos(x**2 + y**2)
      ranges = (x, -2, 2), (y, -2, 2)
  
      s = ContourSeries(expr, *ranges)
      assert s.is_filled
      s = ContourSeries(expr, *ranges, is_filled=True)
      assert s.is_filled
      s = ContourSeries(expr, *ranges, is_filled=False)
      assert not s.is_filled
  
imports: from sympy import latex, exp, symbols, I, pi, sin, cos, tan, log, sqrt, re, im, arg, frac, Sum, S, Abs, lambdify, Function, dsolve, Eq, floor, Tuple
  from sympy.external import import_module
  from sympy.plotting.series import LineOver1DRangeSeries, Parametric2DLineSeries, Parametric3DLineSeries, SurfaceOver2DRangeSeries, ContourSeries, ParametricSurfaceSeries, ImplicitSeries, _set_discretization_points, List2DSeries
  from sympy.testing.pytest import raises, warns, XFAIL, skip, ignore_warnings
label_desc: Use image node_id 11 for calling a global function with example usage: test_is_filled_2d() without return types