code: def testAddToDescriptorWithChildren(self):
      p = Pool()
      p.add("foo.bar", 54)
  
      self.assertRaises(RuntimeError, p.add, "foo", 3.4)
  
imports: from essentia_test import *
label_desc: Use image node_id 21 for calling the TestPool obj's underlying member method code with example usage: obj.testAddToDescriptorWithChildren() without return types