code: def test_given_constant_data_when_perform_approx_kernel_based_test_then_returns_expected_result():
      assert (
          approx_kernel_based(
              np.zeros(100), np.random.normal(0, 1, 100)
          )
          == 1.0
      )
      assert (
          approx_kernel_based(
              np.zeros(100),
              np.random.normal(0, 1, 100),
              np.random.normal(0, 1, 100),
          )
          == 1.0
      )
      assert not np.isnan(
          approx_kernel_based(
              np.random.normal(0, 1, 100),
              np.random.normal(0, 1, 100),
              np.zeros(100),
          )
      )
  
imports: import random
  import numpy
  import pytest
  from flaky import flaky
  from dowhy.gcm.independence_test import approx_kernel_based, kernel_based
label_desc: Use image node_id 19 for calling a global function with example usage: test_given_constant_data_when_perform_approx_kernel_based_test_then_returns_expected_result() without return types