code: def __init__(self):
      self.v1name = ["a0", "a1", "a2"]
      self.v2name = ["b0", "b1"]
      self.d1 = np.array(
          [
              [1, 0, 0],
              [1, 0, 0],
              [1, 0, 0],
              [1, 0, 0],
              [0, 1, 0],
              [0, 1, 0],
              [0, 1, 0],
              [0, 1, 0],
              [0, 0, 1],
              [0, 0, 1],
              [0, 0, 1],
              [0, 0, 1],
          ]
      )
  
imports: from numpy.testing import assert_equal
  import numpy
label_desc: Use image node_id 1 to create a new TestContrastTools object  with example: obj = TestContrastTools()