code: def test_available(self):
      registry = formats.get_registry()
      assert_true("csv" in registry.keys())
      assert_true("json" in registry.keys())
      assert_true("tsv" in registry.keys())
  
imports: import os
  import unittest
  from nose.tools import *
  from textblob import formats
  from textblob.compat import unicode
label_desc: Use image node_id 4 for calling the TestFormats obj's underlying member method code with example usage: obj.test_available() without return types