code: def test_circfunc():
      school = load_arviz_data("centered_eight").posterior["mu"].values
      a_a = _circfunc(school, 8, 4, skipna=False)
      assert np.allclose(a_a, _angle(school, 4, 8, np.pi))
  
imports: import numpy
  import pytest
  from numpy.testing import assert_array_almost_equal
  from scipy.special import logsumexp
  from scipy.stats import circstd
  from ...data import from_dict, load_arviz_data
  from ...stats.density_utils import histogram
  from ...stats.stats_utils import ELPDData, _angle, _circfunc, _circular_standard_deviation, _sqrt, get_log_likelihood
  from ...stats.stats_utils import logsumexp
  from ...stats.stats_utils import make_ufunc, not_valid, stats_variance_2d, wrap_xarray_ufunc
label_desc: Use image node_id 26 for calling a global function with example usage: test_circfunc() without return types