code: def test_project_density_matrix_spectrum(rho):
      """Test the function _project_density_matrix_spectrum behaves as expected for trivial case"""
      new_lambdas = _project_density_matrix_spectrum(rho)
      assert qml.math.allclose(new_lambdas, [1.0])
  
file_path: pennylane/tests/shadow/test_shadow_entropies.py
imports: import pytest
  import pennylane
  import pennylane.numpy
  from pennylane.shadows import ClassicalShadow
  from pennylane.shadows.classical_shadow import _project_density_matrix_spectrum
label_desc: Use image node_id 3 for calling a global function with example usage: test_project_density_matrix_spectrum(rho) without return types