docstr: Test getting the known relations from a processor.
  
  Doesn't test that all the relations exist, since who knows what will change in the future
docstr_tok: ["Test","getting","the","known","relations","from","a","processor",".","Does","n't","test","that","all","the","relations","exist",",","since","who","knows","what","will","change","in","the","future"]
code: def test_get_known_relations(self, english_depparse):
      """
      Test getting the known relations from a processor.
  
      Doesn't test that all the relations exist, since who knows what will change in the future
      """
      relations = english_depparse.get_known_relations()
      assert len(relations) > 5
      assert "case" in relations
      for i in VOCAB_PREFIX:
          assert i not in relations
  
imports: import pytest
  import stanza
  from stanza.models.common.vocab import VOCAB_PREFIX
  from stanza.tests import TEST_MODELS_DIR
label_desc: Use image node_id 2 for calling the TestClassifier obj's underlying member method code with example usage: obj.test_get_known_relations(english_depparse) without return types