code: def test_cut_freq_axis():
      domain = Domain((6, 6), dx=[1.0])
      params = jnp.zeros((6, 6))
      field = FourierSeries(params, domain)
  
      cut_freq = field._cut_freq_axis[0]
      ref = jnp.asarray([0.0, 1.0471976, 2.0943952, 3.1415927])
      assert jnp.allclose(cut_freq, ref)
  
file_path: jaxdf/tests/test_fourierseries.py
imports: import jax.numpy
  import pytest
  from jax import jit
  from jaxdf.discretization import FourierSeries
  from jaxdf.geometry import Domain
label_desc: Use image node_id 3 for calling a global function with example usage: test_cut_freq_axis() without return types