code: def testRealMatrixPoolMultiple(self):
      expectedMat1 = array([[1, 2], [3, 4]])
      expectedMat2 = array([[5, 6], [7, 8]])
  
      p = Pool()
      p.add("foo.bar", expectedMat1)
      p.add("foo.bar", expectedMat2)
  
      self.assertEqualMatrix(p["foo.bar"], [expectedMat1, expectedMat2])
  
imports: from essentia_test import *
label_desc: Use image node_id 26 for calling the TestPool obj's underlying member method code with example usage: obj.testRealMatrixPoolMultiple() without return types