code: def test_gini_coefficient(array_data):
      a, x = array_data
      result = gini_coeffiient(a, x)
      assert isinstance(result, float), "Output should be a float."
      assert (
          0 <= result <= 1
      ), "Gini coefficient should be in the range [0, 1]."
  
imports: import pytest
  import numpy
  from quantus.functions.complexity_func import entropy, gini_coeffiient, discrete_entropy
label_desc: Use image node_id 3 for calling a global function with example usage: test_gini_coefficient(array_data) without return types