code: def test_entropy(array_data):
      a, x = array_data
      result = entropy(a, x)
      assert isinstance(result, float), "Output should be a float."
  
imports: import pytest
  import numpy
  from quantus.functions.complexity_func import entropy, gini_coeffiient, discrete_entropy
label_desc: Use image node_id 2 for calling a global function with example usage: test_entropy(array_data) without return types