class_docstr: Integration tests for classical shadows class
docstr: Test ClassicalShadow.expval can handle different inputs
code: def test_expval_input_types(self, shadow, H):
      """Test ClassicalShadow.expval can handle different inputs"""
      assert qml.math.allclose(shadow.expval(H, k=2), 1.0, atol=1e-1)
  
imports: import pytest
  import numpy
  import pennylane
  import pennylane.numpy
  from pennylane.shadows import ClassicalShadow, median_of_means, pauli_expval
label_desc: Use image node_id 2 for calling the TestIntegrationShadows obj's underlying member method code with example usage: obj.test_expval_input_types(shadow, H) without return types