code: def setUp(self):
      np.random.seed(42)
      self.fake_data = pd.DataFrame(
          np.random.random((1000, 4)), columns=["A", "B", "C", "D"]
      )
      self.estimator = PC(self.fake_data)
  
imports: import unittest
  import networkx
  import numpy
  import pandas
  from joblib.externals.loky import get_reusable_executor
  from pgmpy.estimators import PC
  from pgmpy.independencies import Independencies
  from pgmpy.models import BayesianNetwork
  from pgmpy.sampling import BayesianModelSampling
  from pgmpy.utils import get_example_model
label_desc: Use image node_id 1 for calling the TestPCFakeCITest obj's underlying member method code with example usage: obj.setUp() without return types