code: def test_predicates_correctness(self):
      field = "123 16th st"
      assert fn.sortedAcronym(field) == {"11s"}
      assert fn.wholeFieldPredicate(field) == {"123 16th st"}
      assert fn.firstTokenPredicate(field) == {"123"}
      assert fn.firstTokenPredicate("") == frozenset()
      assert fn.firstTokenPredicate("123/") == {"123"}
      assert fn.firstTwoTokensPredicate(field) == {"123 16th"}
      assert fn.firstTwoTokensPredicate("oneword") == frozenset()
      assert fn.firstTwoTokensPredicate("") == frozenset()
      assert fn.firstTwoTokensPredicate("123 456/") == {"123 456"}
      assert fn.tokenFieldPredicate(" ") == frozenset()
      assert fn.tokenFieldPredicate(field) == {"123", "16th", "st"}
      assert fn.commonIntegerPredicate(field) == {"123", "16"}
      assert fn.commonIntegerPredicate("foo") == frozenset()
      assert fn.firstIntegerPredicate("foo") == frozenset()
      assert fn.firstIntegerPredicate("1foo") == {"1"}
      assert fn.firstIntegerPredicate("f1oo") == frozenset()
      assert fn.sameThreeCharStartPredicate(field) == {"123"}
      assert fn.sameThreeCharStartPredicate("12") == {"12"}
      assert fn.commonFourGram("12") == frozenset()
      assert fn.sameFiveCharStartPredicate(field) == {"12316"}
      assert fn.sameSevenCharStartPredicate(field) == {"12316th"}
      assert fn.nearIntegersPredicate(field) == {
          "15",
          "17",
          "16",
          "122",
          "123",
          "124",
      }
      assert fn.commonFourGram(field) == {
          "1231",
          "2316",
          "316t",
          "16th",
          "6ths",
          "thst",
      }
      assert fn.commonSixGram(field) == {
          "12316t",
          "2316th",
          "316ths",
          "16thst",
      }
      assert fn.initials(field, 12) == {"123 16th st"}
      assert fn.initials(field, 7) == {"123 16t"}
      assert fn.ngrams(field, 3) == [
          "123",
          "23 ",
          "3 1",
          " 16",
          "16t",
          "6th",
          "th ",
          "h s",
          " st",
      ]
      assert fn.unique_ngrams(field, 3) == {
          "123",
          "23 ",
          "3 1",
          " 16",
          "16t",
          "6th",
          "th ",
          "h s",
          " st",
      }
      assert fn.commonTwoElementsPredicate((1, 2, 3)) == {"1 2", "2 3"}
      assert fn.commonTwoElementsPredicate((1,)) == frozenset()
      assert fn.commonThreeElementsPredicate((1, 2, 3)) == {"1 2 3"}
      assert fn.commonThreeElementsPredicate((1,)) == frozenset()
  
      assert fn.fingerprint("time sandwich") == {"sandwichtime"}
      assert fn.oneGramFingerprint("sandwich time") == {"acdehimnstw"}
      assert fn.twoGramFingerprint("sandwich time") == {
          "anchdwhticimmendsatiwi"
      }
      assert fn.twoGramFingerprint("1") == frozenset()
      assert fn.commonTwoTokens("foo bar") == {"foo bar"}
      assert fn.commonTwoTokens("foo") == frozenset()
  
imports: import unittest
  from dedupe import predicate_functions
  from dedupe.cpredicates import ngrams
label_desc: Use image node_id 28 for calling the TestPredicateFunctions obj's underlying member method code with example usage: obj.test_predicates_correctness() without return types