code: def test_alphanumeric(self):
      assert predicates.alphaNumericPredicate("a1") == set(["a1"])
      assert predicates.alphaNumericPredicate("1a") == set(["1a"])
      assert predicates.alphaNumericPredicate("a1b") == set(["a1b"])
      assert predicates.alphaNumericPredicate("1 a") == set(["1"])
      assert predicates.alphaNumericPredicate("a1 b1") == set(
          ["a1", "b1"]
      )
      assert predicates.alphaNumericPredicate("asdf") == set()
      assert predicates.alphaNumericPredicate("1") == set(["1"])
      assert predicates.alphaNumericPredicate("a_1") == set(["1"])
      assert predicates.alphaNumericPredicate("a$1") == set(["1"])
      assert predicates.alphaNumericPredicate("a 1") == set(["1"])
      assert predicates.alphaNumericPredicate("773-555-1676") == set(
          ["773", "555", "1676"]
      )
  
imports: import unittest
  from dedupe import predicates
label_desc: Use image node_id 1 for calling the TestAlpaNumeric obj's underlying member method code with example usage: obj.test_alphanumeric() without return types