docstr: Test with an exact match.
docstr_tok: ["Test","with","an","exact","match","."]
code: def test_preds_cache(self):
      """Test with an exact match."""
      cache = caching.PredsCache("test")
      self.assertEqual("0", cache.info())
      cache.put("test", None)
      self.assertEqual("0", cache.info())
      cache.put("test", ("a", "1"))
      self.assertEqual("1", cache.info())
      self.assertIsNone(None, cache.get(("a", "2")))
      self.assertEqual("test", cache.get(("a", "1")))
  
imports: from absl.testing import absltest
  from absl.testing import parameterized
  from lit_nlp.api import dataset
  from lit_nlp.lib import caching
  from lit_nlp.lib import testing_utils
label_desc: Use image node_id 1 for calling the PredsCacheTest obj's underlying member method code with example usage: obj.test_preds_cache() without return types